2024/05/09 更新

写真a

ノムラ タカノリ
野村 孝徳
所属
役員
職名
理事
兼務
システム工学部(学部長)、Well-being 機構(機構長)、イノベーションイニシアティブ基幹(副基幹長)、電子物理工学メジャー(教授)
emailアドレス
emailアドレス
ホームページ
外部リンク

学歴

  • 大阪大学   工学研究科   応用物理学  

  • 大阪大学   Graduate School, Division of Engineering  

  • 大阪大学   Faculty of Engineering  

  • 大阪大学   工学部   応用物理学  

学位

  • 工学博士

経歴

  • 2009年
    -
    継続中

    和歌山大学システム工学部教授   Faculty of Systems Engineering

  • 2009年

    -date Professor, Faculty of Systems Engineering, Wakayama University

  • 1999年
    -
    2009年

    Asscosite Professor, Faculty of Systems Engineering,

  • 1999年
    -
    2009年

    和歌山大学システム工学部助教授・准教授   Faculty of Systems Engineering

  • 1998年
    -
    1999年

    Visiting Associate Professor, Faculty of Engineering,

  • 1998年
    -
    1999年

    米国コネティカット大学客員助教授

  • 1995年
    -
    1999年

    和歌山大学システム工学部講師   Faculty of Systems Engineering

  • 1995年
    -
    1999年

    Assistant Professor, Faculty of Systems Engineering,

  • 1991年
    -
    1995年

    Research Associate, Faculty of Engineering,

  • 1991年
    -
    1995年

    神戸大学工学部助手   Faculty of Engineering

  • 1990年
    -
    1991年

    日本学術振興会特別研究員(DC)

  • University of Connecticut, USA

  • 神戸大学

  • 和歌山大学

▼全件表示

所属学協会

  • 日本光学会

  • SPIE (The International Society for Optics and Photonics)

  • OPTICA (formerly OSA)

  • 応用物理学会

  • レーザー学会

  • 光学五学会関西支部

▼全件表示

研究分野

  • ナノテク・材料 / 光工学、光量子科学

  • ものづくり技術(機械・電気電子・化学工学) / 計測工学

【学部】授業等(実験、演習、卒業論文指導、卒業研究、課題研究を含む)

  • 2023年度   ディジタル信号処理   専門教育科目

  • 2023年度   電気電子工学実験A   専門教育科目

  • 2023年度   光学   専門教育科目

  • 2023年度   卒業研究(EE・後期)   専門教育科目

  • 2023年度   卒業研究(EE・前期)   専門教育科目

  • 2023年度   卒業研究(EE)   専門教育科目

  • 2023年度   電気電子工学研究実習   専門教育科目

  • 2022年度   電気電子工学研究実習   専門教育科目

  • 2022年度   卒業研究   専門教育科目

  • 2022年度   卒業研究   専門教育科目

  • 2022年度   卒業研究   専門教育科目

  • 2022年度   卒業研究   専門教育科目

  • 2022年度   ディジタル信号処理   専門教育科目

  • 2021年度   システム工学入門セミナー   専門教育科目

  • 2021年度   大学論   教養教育科目

  • 2021年度   電気電子工学研究実習   専門教育科目

  • 2021年度   卒業研究   専門教育科目

  • 2021年度   卒業研究   専門教育科目

  • 2021年度   ディジタル信号処理   専門教育科目

  • 2020年度   卒業研究   専門教育科目

  • 2020年度   卒業研究   専門教育科目

  • 2020年度   電気電子工学研究実習   専門教育科目

  • 2020年度   ディジタル信号処理   専門教育科目

  • 2020年度   光学   専門教育科目

  • 2020年度   基礎電磁気学   専門教育科目

  • 2019年度   卒業研究   専門教育科目

  • 2019年度   電子計測研究実習   専門教育科目

  • 2019年度   計測システム実験A   専門教育科目

  • 2019年度   メジャー紹介講義2   専門教育科目

  • 2019年度   メジャー紹介講義2   専門教育科目

  • 2019年度   ディジタル信号処理   専門教育科目

  • 2019年度   光学   専門教育科目

  • 2019年度   基礎電磁気学   専門教育科目

  • 2018年度   基礎電磁気学   専門教育科目

  • 2018年度   システム工学入門セミナー   専門教育科目

  • 2018年度   ディジタル信号処理   専門教育科目

  • 2018年度   光学   専門教育科目

  • 2017年度   光学   専門教育科目

  • 2017年度   基礎電磁気学   専門教育科目

  • 2016年度   光メカトロニクス応用ゼミ   専門教育科目

  • 2016年度   研究実習   専門教育科目

  • 2016年度   システム工学入門セミナー   専門教育科目

  • 2016年度   信号処理論   専門教育科目

  • 2016年度   光学   専門教育科目

  • 2016年度   基礎電磁気学   専門教育科目

  • 2015年度   信号処理論   専門教育科目

  • 2015年度   光メカトロニクス応用ゼミ   専門教育科目

  • 2015年度   光学   専門教育科目

  • 2015年度   研究実習   専門教育科目

  • 2015年度   基礎電磁気学   専門教育科目

  • 2014年度   光メカトロニクス応用ゼミ   専門教育科目

  • 2014年度   研究実習   専門教育科目

  • 2014年度   信号処理論   専門教育科目

  • 2014年度   光メカトロニクス入門セミナー   専門教育科目

  • 2014年度   光学   専門教育科目

  • 2014年度   基礎電磁気学   専門教育科目

  • 2014年度   基礎教養セミナー   教養教育科目

  • 2013年度   光メカトロニクス応用ゼミ   専門教育科目

  • 2013年度   研究実習   専門教育科目

  • 2013年度   信号処理論   専門教育科目

  • 2013年度   光メカトロニクス入門セミナー   専門教育科目

  • 2013年度   光学   専門教育科目

  • 2013年度   身の回りのデジタル機器のしくみ   教養教育科目

  • 2012年度   卒業研究   専門教育科目

  • 2012年度   信号処理論   専門教育科目

  • 2012年度   光メカトロニクス入門セミナー   専門教育科目

  • 2012年度   光メカトロニクス応用ゼミ   専門教育科目

  • 2012年度   基礎教養セミナー   教養教育科目

  • 2012年度   キャリアアップセミナー   専門教育科目

  • 2012年度   卒業研究   専門教育科目

  • 2012年度   身の回りのデジタル機器のしくみ   教養教育科目

  • 2012年度   光学   専門教育科目

  • 2012年度   研究実習   専門教育科目

  • 2011年度   身の回りのデジタル機器のしくみ   教養教育科目

  • 2011年度   卒業研究   専門教育科目

  • 2011年度   卒業研究   専門教育科目

  • 2011年度   光メカトロニクス応用ゼミ   専門教育科目

  • 2011年度   研究実習   専門教育科目

  • 2011年度   基礎教養セミナー   教養教育科目

  • 2011年度   基礎電磁気学   専門教育科目

  • 2011年度   キャリアアップセミナー   専門教育科目

  • 2011年度   信号処理論   専門教育科目

  • 2011年度   光メカトロニクス入門セミナー   専門教育科目

  • 2011年度   光学   専門教育科目

  • 2011年度   身の回りのデジタル機器のしくみ   教養教育科目

  • 2010年度   研究実習   専門教育科目

  • 2010年度   信号処理論   専門教育科目

  • 2010年度   応用光学   専門教育科目

  • 2010年度   光学   専門教育科目

  • 2010年度   基礎教養セミナー   専門教育科目

  • 2010年度   光メカトロニクス実験C   専門教育科目

  • 2010年度   光メカトロニクス実験D   専門教育科目

  • 2010年度   光メカトロニクス入門セミナー   専門教育科目

  • 2010年度   身の回りのデジタル機器のしくみ   専門教育科目

  • 2009年度   研究実習   専門教育科目

  • 2009年度   光メカトロニクス実験D   専門教育科目

  • 2009年度   光メカトロニクス実験C   専門教育科目

  • 2009年度   応用光学   専門教育科目

  • 2009年度   基礎光学   専門教育科目

  • 2009年度   基礎電磁気学応用演習   専門教育科目

  • 2009年度   基礎電磁気学   専門教育科目

  • 2009年度   光メカトロニクス入門セミナー   専門教育科目

  • 2009年度   卒業研究   専門教育科目

  • 2009年度   身の回りのデジタル機器のしくみ   教養教育科目

  • 2008年度   研究実習   専門教育科目

  • 2008年度   光メカトロニクス実験D   専門教育科目

  • 2008年度   光メカトロニクス実験C   専門教育科目

  • 2008年度   応用光学   専門教育科目

  • 2008年度   基礎光学   専門教育科目

  • 2008年度   光メカトロニクス入門セミナー   専門教育科目

  • 2008年度   卒業研究   専門教育科目

  • 2008年度   身の回りのデジタル機器のしくみ   教養教育科目

  • 2007年度   研究実習   専門教育科目

  • 2007年度   光メカトロニクス実験D   専門教育科目

  • 2007年度   光メカトロニクス実験C   専門教育科目

  • 2007年度   応用光学   専門教育科目

  • 2007年度   基礎光学   専門教育科目

  • 2007年度   光メカトロニクス入門セミナー   専門教育科目

  • 2007年度   卒業研究   専門教育科目

  • 2007年度   身の回りのデジタル機器のしくみ   教養教育科目

▼全件表示

【学部】サテライト科目

  • 2019年度   【選択】身近なモノを使って光学を学ぼう   教養教育科目

  • 2018年度   【選択】身近なモノを使って光学を学ぼう   教養教育科目

  • 2015年度   身の回りのデジタル機器のしくみ   教養教育科目

  • 2011年度   身の回りのデジタル機器のしくみ   教養教育科目

【大学院】授業等

  • 2023年度   システム工学講究ⅠA(物理工学)   博士前期

  • 2023年度   システム工学講究ⅠB(物理工学)   博士前期

  • 2023年度   システム工学講究ⅡA(物理工学)   博士前期

  • 2023年度   システム工学講究ⅡB(物理工学)   博士前期

  • 2023年度   光情報工学   博士前期

  • 2023年度   システム工学研究ⅠA(物理工学)   博士前期

  • 2023年度   システム工学研究ⅠB(物理工学)   博士前期

  • 2023年度   システム工学研究ⅡA(物理工学)   博士前期

  • 2023年度   システム工学研究ⅡB(物理工学)   博士前期

  • 2023年度   システム工学特別講究Ⅰ   博士後期

  • 2023年度   システム工学特別講究Ⅰ   博士後期

  • 2023年度   システム工学特別講究Ⅱ   博士後期

  • 2023年度   システム工学特別講究Ⅱ   博士後期

  • 2023年度   システム工学特別研究   博士後期

  • 2023年度   システム工学特別研究   博士後期

  • 2023年度   システム工学グローバル講究Ⅰ   博士後期

  • 2023年度   システム工学グローバル講究Ⅰ   博士後期

  • 2023年度   システム工学グローバル講究Ⅱ   博士後期

  • 2023年度   システム工学グローバル講究Ⅱ   博士後期

  • 2022年度   システム工学講究ⅠB   博士前期

  • 2022年度   システム工学講究ⅠA   博士前期

  • 2022年度   システム工学グローバル講究Ⅱ   博士後期

  • 2022年度   システム工学グローバル講究Ⅰ   博士後期

  • 2022年度   システム工学特別研究   博士後期

  • 2022年度   システム工学特別講究Ⅱ   博士後期

  • 2022年度   システム工学特別講究Ⅰ   博士後期

  • 2022年度   システム工学研究ⅡB   博士前期

  • 2022年度   システム工学研究ⅡA   博士前期

  • 2022年度   システム工学研究ⅠB   博士前期

  • 2022年度   システム工学研究ⅠA   博士前期

  • 2022年度   光情報工学   博士前期

  • 2022年度   システム工学講究ⅡB   博士前期

  • 2022年度   システム工学講究ⅡA   博士前期

  • 2021年度   システム工学グローバル講究Ⅱ   博士後期

  • 2021年度   システム工学グローバル講究Ⅰ   博士後期

  • 2021年度   システム工学特別研究   博士後期

  • 2021年度   システム工学特別講究Ⅱ   博士後期

  • 2021年度   システム工学特別講究Ⅰ   博士後期

  • 2021年度   システム工学研究ⅡB   博士前期

  • 2021年度   システム工学研究ⅡA   博士前期

  • 2021年度   システム工学研究ⅠB   博士前期

  • 2021年度   システム工学研究ⅠA   博士前期

  • 2021年度   光情報工学   博士前期

  • 2021年度   システム工学講究ⅡB   博士前期

  • 2021年度   システム工学講究ⅡA   博士前期

  • 2021年度   システム工学講究ⅠB   博士前期

  • 2021年度   システム工学講究ⅠA   博士前期

  • 2020年度   システム工学グローバル講究Ⅱ   博士後期

  • 2020年度   システム工学グローバル講究Ⅰ   博士後期

  • 2020年度   システム工学特別研究   博士後期

  • 2020年度   システム工学特別講究Ⅱ   博士後期

  • 2020年度   システム工学特別講究Ⅰ   博士後期

  • 2020年度   システム工学研究ⅡB   博士前期

  • 2020年度   システム工学研究ⅡA   博士前期

  • 2020年度   システム工学研究ⅠB   博士前期

  • 2020年度   システム工学研究ⅠA   博士前期

  • 2020年度   光情報工学   博士前期

  • 2020年度   システム工学講究ⅡB   博士前期

  • 2020年度   システム工学講究ⅡA   博士前期

  • 2020年度   システム工学講究ⅠB   博士前期

  • 2020年度   システム工学講究ⅠA   博士前期

  • 2019年度   光情報工学   博士前期

  • 2019年度   システム工学特別研究   博士後期

  • 2019年度   システム工学特別研究   博士後期

  • 2019年度   システム工学講究ⅡB   博士前期

  • 2019年度   システム工学講究ⅡA   博士前期

  • 2019年度   システム工学講究ⅠB   博士前期

  • 2019年度   システム工学講究ⅠA   博士前期

  • 2019年度   システム工学グローバル講究Ⅰ   博士後期

  • 2019年度   システム工学グローバル講究Ⅰ   博士後期

  • 2019年度   システム工学研究ⅡB   博士前期

  • 2019年度   システム工学研究ⅡA   博士前期

  • 2019年度   システム工学研究ⅡA   博士前期

  • 2019年度   システム工学研究ⅠB   博士前期

  • 2019年度   システム工学研究ⅠA   博士前期

  • 2018年度   システム工学グローバル講究Ⅱ   博士後期

  • 2018年度   システム工学グローバル講究Ⅱ   博士後期

  • 2018年度   システム工学特別研究   博士後期

  • 2018年度   システム工学特別研究   博士後期

  • 2018年度   システム工学研究ⅡB   博士前期

  • 2018年度   システム工学研究ⅡA   博士前期

  • 2018年度   システム工学研究ⅠB   博士前期

  • 2018年度   システム工学研究ⅠA   博士前期

  • 2018年度   システム工学講究ⅡB   博士前期

  • 2018年度   システム工学講究ⅡA   博士前期

  • 2018年度   システム工学講究ⅠB   博士前期

  • 2018年度   システム工学講究ⅠA   博士前期

  • 2018年度   光情報工学   博士前期

  • 2017年度   システム工学グローバル講究Ⅰ   博士後期

  • 2017年度   システム工学特別研究   博士後期

  • 2017年度   システム工学特別研究   博士後期

  • 2017年度   システム工学特別講究Ⅱ   博士後期

  • 2017年度   システム工学特別講究Ⅱ   博士後期

  • 2017年度   システム工学研究ⅡB   博士前期

  • 2017年度   システム工学研究ⅡA   博士前期

  • 2017年度   システム工学研究ⅠB   博士前期

  • 2017年度   システム工学研究ⅠA   博士前期

  • 2017年度   光情報工学   博士前期

  • 2017年度   システム工学講究ⅡB   博士前期

  • 2017年度   システム工学講究ⅡA   博士前期

  • 2017年度   システム工学講究ⅠB   博士前期

  • 2017年度   システム工学講究ⅠA   博士前期

  • 2016年度   システム工学特別研究   博士後期

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  • 2016年度   システム工学研究ⅡA   博士前期

  • 2016年度   システム工学研究ⅠB   博士前期

  • 2016年度   システム工学研究ⅠA   博士前期

  • 2016年度   システム工学講究ⅡB   博士前期

  • 2016年度   システム工学講究ⅡA   博士前期

  • 2016年度   システム工学講究ⅠB   博士前期

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  • 2014年度   システム工学特別講究Ⅰ   その他

  • 2014年度   システム工学研究ⅡB   その他

  • 2014年度   システム工学研究ⅡA   その他

  • 2014年度   システム工学研究ⅠB   その他

  • 2014年度   システム工学研究ⅠA   その他

  • 2014年度   光情報工学   その他

  • 2014年度   システム工学講究ⅡB   その他

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  • 2014年度   システム工学講究ⅠB   その他

  • 2014年度   システム工学講究ⅠA   その他

  • 2013年度   システム工学特別研究   その他

  • 2013年度   システム工学特別研究   その他

  • 2013年度   システム工学特別講究Ⅱ   その他

  • 2013年度   システム工学特別講究Ⅱ   その他

  • 2013年度   システム工学特別講究Ⅰ   その他

  • 2013年度   システム工学特別講究Ⅰ   その他

  • 2013年度   システム工学研究ⅡB   その他

  • 2013年度   システム工学研究ⅡA   その他

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  • 2011年度   システム工学研究ⅡB   その他

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  • 2011年度   システム工学講究(ⅠB・ⅡB)   その他

  • 2011年度   システム工学講究(ⅠA・ⅡA)   その他

  • 2011年度   システム工学特別講究Ⅱ   その他

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  • 2011年度   システム工学特別講究Ⅰ   その他

  • 2011年度   システム工学特別講究Ⅰ   その他

  • 2011年度   光情報工学   その他

  • 2010年度   光情報工学   博士前期

  • 2010年度   システム工学講究IA   博士前期

  • 2010年度   システム工学講究IIA   博士前期

  • 2010年度   システム工学研究IA   博士前期

  • 2010年度   システム工学研究IIA   博士前期

  • 2010年度   システム工学研究IB   博士前期

  • 2010年度   システム工学研究IIB   博士前期

  • 2010年度   システム工学講究IIB   博士前期

  • 2010年度   システム工学講究IB   博士前期

  • 2009年度   光情報工学   博士前期

  • 2009年度   システム工学研究IIA・IIB   博士前期

  • 2009年度   システム工学研究IA・IB   博士前期

  • 2009年度   システム工学講究IIA・IIB   博士前期

  • 2009年度   システム工学講究IA・IB   博士前期

  • 2008年度   光情報工学   博士前期

  • 2008年度   システム工学研究IIA・IIB   博士前期

  • 2008年度   システム工学研究IA・IB   博士前期

  • 2008年度   システム工学講究IIA・IIB   博士前期

  • 2008年度   システム工学講究IA・IB   博士前期

  • 2007年度   光情報工学   博士前期

  • 2007年度   システム工学研究II   博士前期

  • 2007年度   システム工学研究I   博士前期

  • 2007年度   システム工学講究II   博士前期

  • 2007年度   システム工学講究I   博士前期

▼全件表示

受賞(教育活動に関するもの)

  • 2008年度   グッドレクチャー賞システム工学部部門   和歌山大学   国内

研究キーワード

  • 情報フォトニクス 光セキュリティ 光応用計測

  • Information Optics Optical Information Processing Optical Instrumentation

論文

  • Computational Optical Scanning Holography

    Naru Yoneda, Jung-Ping Liu, Osamu Matoba, Yusuke Saita, Takanori Nomura

    Photonics ( MDPI AG )  11 ( 4 ) 347 - 347   2024年04月

     概要を見る

    Holographic techniques are indispensable tools for modern optical engineering. Over the past two decades, research about incoherent digital holography has continued to attract attention. Optical scanning holography (OSH) can obtain incoherent holograms using single-pixel detection and structured illumination with Fresnel zone patterns (FZPs). Particularly by changing the size of a detector, OSH can also obtain holograms under coherently illuminated conditions. Since 1979, OSH has continuously evolved. According to the evolution of semiconductor technology, spatial light modulators (SLMs) come to be useful for various imaging fields. By using SLM techniques for OSH, the practicality of OSH is improved. These SLM-based OSH methods are termed computational OSH (COSH). In this review, the configurations, recording and reconstruction methods, and proposed applications of COSH are reviewed.

    DOI

  • Quantitative phase imaging based on motionless optical scanning holography

    Naru Yoneda, Osamu Matoba, Yusuke Saita, Takanori Nomura (担当区分: 最終著者 )

    Optics Letters ( Optica Publishing Group )  48 ( 20 ) 5273 - 5273   2023年10月

     概要を見る

    Optical scanning holography (OSH) can be applied to 3D fluorescent imaging. However, the optical setup for OSH is complicated due to the requirement of a phase shifter, a 2D mechanical scanner, and an interferometer. Although motionless optical scanning holography (MOSH) can overcome the problem, quantitative phase imaging (QPI) has not yet been realized because MOSH can only obtain incoherent holograms. If QPI in MOSH is realized, MOSH can be applied to various applications. In this Letter, MOSH-based QPI (MOSH-QPI) is proposed. In addition, a simple description of a coherent mode of OSH is presented. In the proof-of-principle experiment, the spatially divided phase-shifting technique is applied to reduce the number of measurements. The feasibility of MOSH-QPI is confirmed by measuring a phase distribution of a microlens array. MOSH-QPI is also applied to measure practical samples, and its results are compared with the experimental results of the conventional one using a Mach–Zehnder interferometer.

    DOI

  • Polarization imaging by use of optical scanning holography

    Naru Yoneda, Yusuke Saita, Takanori Nomura (担当区分: 最終著者 )

    Optical Review ( Springer Science and Business Media LLC )    2022年11月  [査読有り]

    DOI

  • Common-path off-axis single-pixel holographic imaging

    Naru Yoneda, Yusuke Saita, Takanori Nomura (担当区分: 最終著者 )

    Optics Express ( Optica Publishing Group )  30 ( 11 ) 18134 - 18134   2022年05月  [査読有り]

    DOI

  • Single-shot compressive hyperspectral imaging with dispersed and undispersed light using a generally available grating

    Yusuke Saita, Daiki Shimoyama, Ryohei Takahashi, Takanori Nomura (担当区分: 最終著者 )

    Applied Optics ( The Optical Society )  61 ( 5 ) 1106 - 1106   2022年02月  [査読有り]

    DOI

  • [Invited Paper] Enhanced Recording Density via Multilevel Phase Retrieval and Correlation-based Multiplexed Recording in Computer-generated Holographic Data Storage

    Yusuke Saita, Naru Yoneda, Aoto Matsumoto, Takanori Nomura (担当区分: 最終著者 )

    ITE Transactions on Media Technology and Applications ( Institute of Image Information and Television Engineers )  10 ( 2 ) 69 - 74   2022年  [査読有り]

    DOI

  • Roadmap on digital holography [Invited]

    Bahram Javidi, Artur Carnicer, Arun Anand, George Barbastathis, Wen Chen, Pietro Ferraro, J. W. Goodman, Ryoichi Horisaki, Kedar Khare, Malgorzata Kujawinska, Rainer A. Leitgeb, Pierre Marquet, Takanori Nomura, Aydogan Ozcan, YongKeun Park, Giancarlo Pedrini, Pascal Picart, Joseph Rosen, Genaro Saavedra, Natan T. Shaked, Adrian Stern, Enrique Tajahuerce, Lei Tian, Gordon Wetzstein, Masahiro Yamaguchi

    Optics Express ( The Optical Society )  29 ( 22 ) 35078 - 35078   2021年10月  [査読有り]  [招待有り]

    DOI

  • Three-dimensional fluorescence imaging through dynamic scattering media by motionless optical scanning holography

    Naru Yoneda, Yusuke Saita, Takanori Nomura (担当区分: 最終著者 )

    Applied Physics Letters ( AIP Publishing )  119 ( 16 ) 161101 - 161101   2021年10月  [査読有り]

    DOI

  • Single-shot higher-order transport-of-intensity quantitative phase imaging using deep learning

    Naru Yoneda, Shunsuke Kakei, Koshi Komuro, Aoi Onishi, Yusuke Saita, Takanori Nomura (担当区分: 最終著者 )

    Applied Optics ( The Optical Society )  60 ( 28 ) 8802 - 8802   2021年10月  [査読有り]

    DOI

  • Roadmap on Recent Progress in FINCH Technology

    Joseph Rosen, Simon Alford, Vijayakumar Anand, Jonathan Art, Petr Bouchal, Zdeněk Bouchal, Munkh-Uchral Erdenebat, Lingling Huang, Ayumi Ishii, Saulius Juodkazis, Nam Kim, Peter Kner, Takako Koujin, Yuichi Kozawa, Dong Liang, Jun Liu, Christopher Mann, Abhijit Marar, Atsushi Matsuda, Teruyoshi Nobukawa, Takanori Nomura, Ryutaro Oi, Mariana Potcoava, Tatsuki Tahara, Bang Le Thanh, Hongqiang Zhou

    Journal of Imaging ( MDPI AG )  7 ( 10 ) 197 - 197   2021年09月  [査読有り]

     概要を見る

    Fresnel incoherent correlation holography (FINCH) was a milestone in incoherent holography. In this roadmap, two pathways, namely the development of FINCH and applications of FINCH explored by many prominent research groups, are discussed. The current state-of-the-art FINCH technology, challenges, and future perspectives of FINCH technology as recognized by a diverse group of researchers contributing to different facets of research in FINCH have been presented.

    DOI

  • Fast and accurate phase-unwrapping algorithm based on the transport of intensity equation: comment

    Naru Yoneda, Takahiro Sakai, Takanori Nomura (担当区分: 最終著者 )

    Applied Optics ( The Optical Society )  60 ( 24 ) 7500 - 7501   2021年08月  [査読有り]

    DOI

  • Common-path angular-multiplexing holographic data storage based on computer-generated holography

    Naru Yoneda, Teruyoshi Nobukawa, Toshiyuki Morimoto, Yusuke Saita, Takanori Nomura (担当区分: 最終著者 )

    Optics Letters ( The Optical Society )  46 ( 12 ) 2920 - 2920   2021年06月  [査読有り]

    DOI

  • Pupil-modulation ghost phase imaging

    Takafumi Ito, Koshi Komuro, Takanori Nomura (担当区分: 最終著者, 責任著者 )

    Applied Optics   60 ( 15 ) 4398 - 4403   2021年05月  [査読有り]

     概要を見る

    Computational ghost imaging (CGI) allows us to reconstruct images under a low signal-to-noise-ratio condition. However, CGI cannot retrieve phase information; it is unsuitable for observation of transparent objects such as living cells. A phase imaging method with CGI architecture is proposed. The proposed method realizes phase imaging with a simple optical setup by introducing pupil modulation differential phase contrast (PMDPC) to CGI. In PMDPC, phase information can be obtained from intensity distributions, which have phase gradient information, and its optical setup is similar to that of CGI. Therefore, the two methods are highly compatible, and the introduction of PMDPC to CGI can be easily achieved. Numerical simulation and an optical experiment demonstrated the feasibility of the proposed method.

    DOI

  • Single-shot higher-order transport-of-intensity quantitative phase imaging based on computer-generated holography

    NARU YONEDA, AOI ONISHI, YUSUKE SAITA, KOSHI KOMURO, TAKANORI NOMURA (担当区分: 最終著者 )

    Optics Express ( OPTICAL SOC AMER )  29 ( 4 ) 4783 - 4801   2021年02月  [査読有り]

     概要を見る

    The imaging quality of quantitative phase imaging (QPI) based on the transport of intensity equation (TIE) can be improved using a higher-order approximation for defocused intensity distributions. However, this requires mechanically scanning an image sensor or object along the optical axis, which in turn requires a precisely aligned optical setup. To overcome this problem, a computer-generated hologram (CGH) technique is introduced to TIE-based QPI. A CGH generating defocused point spread function is inserted in the Fourier plane of an object. The CGH acts as a lens and grating with various focal lengths and orientations, allowing multiple defocused intensity distributions to be simultaneously detected on an image sensor plane. The results of a numerical simulation and optical experiment demonstrated the feasibility of the proposed method.

    DOI

  • Spatially divided phase-shifting motionless optical scanning holography

    Naru Yoneda, Yusuke Saita, Takanori Nomura (担当区分: 最終著者 )

    OSA Continuum ( OPTICAL SOC AMER )  3 ( 12 ) 3523 - 3535   2020年12月  [査読有り]

     概要を見る

    Motionless optical scanning holography (MOSH) has been proposed for threedimensional incoherent imaging in single-pixel holography with a simple optical setup. To reduce the measurement time in MOSH, a spatially divided phase-shifting technique is introduced. The proposed method realizes measurements four times faster than the original MOSH, owing to the simultaneous lateral and phase shifts of a time-varying Fresnel zone plate. A hologram reproduced by the proposed method forms a spatially multiplexed phase-shifting hologram similar to parallel phase-shifting digital holography. The effectiveness of the proposed method is numerically and experimentally verified.

    DOI

  • Single-shot in-line Fresnel incoherent holography using a dual-focus checkerboard lens

    Shota Sakamaki, Naru Yoneda, Takanori Nomura (担当区分: 最終著者, 責任著者 )

    APPLIED OPTICS ( OPTICAL SOC AMER )  59 ( 22 ) 6612 - 6618   2020年08月  [査読有り]

     概要を見る

    Fresnel incoherent correlation holography (FINCH) is a technology that can acquire three-dimensional information of incoherent objects such as fluorescence with an in-line optical system. However, it is difficult to apply FINCH to dynamic phenomena, since FINCH has to detect phase-shifted holograms sequentially to eliminate twin and zero-order images. In this paper, a method in which the phase-shifted holograms can be obtained simultaneously with an in-line setup by using an optimized simulated diffraction optical element (sDOE), realized by a phase-only spatial light modulator, is proposed. The optimized sDOE is an optical device with a dual-focus lens, 2D grating, and spatial phase shifter. Therefore, the sDOE is called a dual-focus checkerboard lens. The optical experiment confirms the feasibility of the proposed method. (C) 2020 Optical Society of America

    DOI

  • Multiplexed recording based on the reference wave correlation for computer-generated holographic data storage

    Yusuke Saita, Aoto Matsumoto, Naru Yoneda, Takanori Nomura (担当区分: 最終著者 )

    OPTICAL REVIEW ( OPTICAL SOC JAPAN )  27 ( 4 ) 391 - 398   2020年08月  [査読有り]

     概要を見る

    Holographic data storage (HDS) based on a computer-generated hologram (CGH) technique has been proposed as a promising approach to realize an in-line and simple HDS system. This work focuses on multiplexed recording for CGH-based HDS, and the approach based on the reference wave correlation is introduced to the HDS. For the proposed method, the processes for a CGH design are modified to generate reference waves with different phase distributions for each recording. Since holograms are recorded to the same region in a medium with independent reference waves, recorded data-pages are selectively reconstructed by the corresponding reference wave illuminations. The experimental demonstration confirms the feasibility of the proposed method, and the theoretical characteristic for the number of recordable multiplexed holograms is estimated by the numerical simulation.

    DOI

  • Motionless optical scanning holography

    Naru Yoneda, Yusuke Saita, Takanori Nomura (担当区分: 最終著者 )

    OPTICS LETTERS ( OPTICAL SOC AMER )  45 ( 12 )   2020年06月  [査読有り]

     概要を見る

    Optical scanning holography (OSH) is an attractive technique since 3D information can be obtained with a single pixel detector. However, OSH requires an interferometer, scanning architecture, and a frequency shifter to scan a time-varying Fresnel zone plate (FZP), which makes the optical setup complicated. To reduce the complexity, the polarization sensitivity of a spatial light modulator (SLM) is applied. The proposed method implements a time-varying FZP with an in-line optical setup by using only an SLM. Observing results for a USAF pattern and a fluorescent bead reveals the feasibility of the new motionless holographic 3D imaging technique. (C) 2020 Optical Society of America

    DOI

  • Computer-generated-hologram-based holographic data storage using common-path off-axis digital holography

    Naru Yoneda, Yusuke Saita, Takanori Nomura (担当区分: 最終著者 )

    OPTICS LETTERS ( OPTICAL SOC AMER )  45 ( 10 ) 2796 - 2799   2020年05月  [査読有り]

     概要を見る

    A reconstruction method for multilevel complex encoded data-pages is proposed to increase the recording density of computer-generated-hologram-based holographic data storage by using off-axis digital holography. Although the detection process is based on off-axis digital holography, the proposed method keeps the optical setup a simple and common-path configuration owing to the computer-generated holography. Five-level complex encoded data-pages can be experimentally reconstructed. (C) 2020 Optical Society of America

    DOI

  • Complex amplitude mapping based on adaptive autofocusing algorithm

    Komuro Koshi, Oe Kazusa, Tamada Yosuke, Nomura Takanori (担当区分: 最終著者 )

    OPTICAL REVIEW ( OPTICAL SOC JAPAN )  26 ( 3 ) 342 - 348   2019年06月  [査読有り]

     概要を見る

    Since a complex amplitude distribution can be obtained in only a single two-dimensional plane using conventional imaging techniques, it is hard to obtain in-focus complex amplitude of three-dimensional structure (not a thin object) or multiple objects in different depth positions. The disadvantage often turns an obstacle to practical applications such as cell observation, particle measurement, and industrial inspection. To overcome the problem, adaptive autofocusing algorithm (AAA) is proposed. AAA consists of a complex amplitude measurement, numerical propagation, and local sharpness evaluation. In the proposed method, object positions can be determined for each pixel in the complex amplitude distribution using adaptively chosen area size of local sharpness evaluation. The proposed method gives a complex amplitude distribution which focuses on all objects or structure over an entire field of view. An optical experiment is carried out using the transport of intensity equation as a complex amplitude measurement. Performance of the proposed method is confirmed using living leaves of the moss Physcomitrella patens. Experimental results show that the object positions can be determined pixelwise and a focused complex amplitude distribution can be obtained by the proposed method.

    DOI

  • Binary computer-generated-hologram-based holographic data storage

    Naru Yoneda, Yusuke Saita, Takanori Nomura (担当区分: 最終著者 )

    APPLIED OPTICS ( OPTICAL SOC AMER )  58 ( 12 ) 3083 - 3090   2019年04月  [査読有り]

     概要を見る

    Conventional computer-generated-hologram-based holographic data storage (CGH-HDS) needs to use a multilevel modulatable spatial light modulator (SLM). A binary SLM usually has a higher refresh rate than a multilevel one, and it enables HDS to increase the data transfer rate. To increase the data transfer rate by using a binary SLM, the introduction of a binary CGH is proposed. In general, a binary CGH degrades the image quality of reconstructed intensity distribution and emphasizes high spatial frequency components of datapages. In the proposed method, reconstructed intensity distributions that satisfy image quality as datapages can be obtained with low-pass filtering with an aperture at a plane of a recording medium. The optimum size of an aperture is numerically evaluated. The proposed method is experimentally verified. Moreover, the proposed method can achieve single and multiplexed recording of three datapages by a spherical reference beam with a binary CGH. (C) 2019 Optical Society of America

    DOI

  • Computational ghost imaging with designed low spatial frequency masks

    Yuya Yamazaki, Takanori Nomura (担当区分: 最終著者, 責任著者 )

    APPLIED OPTICS ( OPTICAL SOC AMER )  57 ( 31 ) 9375 - 9380   2018年11月  [査読有り]

     概要を見る

    Minimally invasive imaging using weak illumination is required in the biomedical field. Computational ghost imaging (CGI) achieves imaging under illumination. However, CGI requires a large number of measurements to obtain an image. The number of measurements increases as illumination weakens. In this paper, decreasing the number of measurements of CGI with designed low spatial frequency masks is proposed. The proposed method allows us to image an object with a smaller number of measurements than with the conventional method. Numerical simulations and experiments confirm the feasibility of the proposed method. (C) 2018 Optical Society of America.

    DOI

  • Transport-of-intensity holographic data storage based on a computer-generated hologram

    Naru Yoneda, Yusuke Saita, Koshi Komuro, Teruyoshi Nobukawa, Takanori Nomura (担当区分: 責任著者 )

    APPLIED OPTICS ( OPTICAL SOC AMER )  57 ( 30 ) 8836 - 8840   2018年10月  [査読有り]

     概要を見る

    To increase the recording density of computer-generated-hologram (CGH)-based holographic data storage, a phase data page reconstruction method by the transport of intensity equation (TIE) is proposed. The TIE generally requires a scanning image sensor because the phase retrieval process needs at least two defocused intensity distributions. Although the TIE is applied, the proposed method enables detection of the distributions simultaneously by utilizing an extra conjugate component reconstructed from the CGH. Experimental results show that the proposed method allows reconstructing of a phase data page without any additional elements, which keeps the optical setup simple and low cost. (C) 2018 Optical Society of America

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  • Phase-unwrapping-free and iterative reconstruction methods for propagated refractive index tomography

    Ikezaki Aina, Nomura Takanori (担当区分: 最終著者, 責任著者 )

    JAPANESE JOURNAL OF APPLIED PHYSICS ( IOP PUBLISHING LTD )  57 ( 9 )   2018年09月  [査読有り]

     概要を見る

    Phase-unwrapping-free and iterative reconstruction methods for propagated refractive index ( RI) tomography, which introduces lightwave back-propagation to a filtered back-projection method, are proposed. The phase-unwrapping-free method utilizes phase retrieval using a transport-of-intensity equation that does not require phase unwrapping. This method overcomes phase unwrapping problems of high calculation cost and phase unwrapping error when measuring millimeter-thick and/or large-RI-changes specimens. In the iterative method, a simultaneous iterative reconstruction technique in X-ray computed tomography is applied to the propagated RI tomography. This method leads to the reduction of the radial artifacts and the elimination of the need for a high-pass filter regardless of the shape and size of specimens. Hence, the accuracy of a reconstructed RI map is improved. Numerical simulations and optical experiments are carried out to prove the feasibility of the proposed methods. (c) 2018 The Japan Society of Applied Physics

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  • Refractive index tomography based on optical coherence tomography and tomographic reconstruction algorithm (vol 56, 09NB03, 2017)

    Kitazawa Takahiro, Nomura Takanori (担当区分: 最終著者 )

    JAPANESE JOURNAL OF APPLIED PHYSICS ( IOP PUBLISHING LTD )  57 ( 8 )   2018年08月  [査読有り]

    DOI

  • Twin-image reduction method using a diffuser for phase imaging in-line digits holography

    Oe Kazusa, Nomura Takanori (担当区分: 最終著者, 責任著者 )

    APPLIED OPTICS ( OPTICAL SOC AMER )  57 ( 20 ) 5652 - 5656   2018年07月  [査読有り]

     概要を見る

    Phase imaging by digital holography is widely used. An in-line optical setup is preferable for a practical use. A twin image, however, is a serious obstacle to achievement of high-quality phase imaging in in-line digital holography. For in-line digital holography, a time-division phase-shifting method or a wave-splitting phase-shifting method is used to eliminate the twin image. The former requires multiple exposures, and the latter requires specially designed optical elements. To solve these problems, a twin-image reduction method using a diffuser is proposed. In the proposed method, recording a digital hologram using a diffuser and signal processing enable reduction of the twin image on a reconstructed plane. A preliminary experimental result confirms the feasibility of the proposed method. (C) 2018 Optical Society of America

    DOI

  • Transport-of-intensity computational ghost imaging

    Komuro Koshi, Yamazaki Yuya, Nomura Takanori (担当区分: 最終著者 )

    APPLIED OPTICS ( OPTICAL SOC AMER )  57 ( 16 ) 4451 - 4456   2018年06月  [査読有り]

     概要を見る

    Computational ghost imaging (CGI) allows us to obtain a sample image under a low signal-to-noise-ratio (SNR) condition. However, phase information cannot be obtained by CGI; therefore, observation of transparent objects such as living cells is difficult. Although interferometry has been applied to CGI for phase retrieval, its optical setup is cumbersome. In this paper, an alternative approach, which is based on a transport-of-intensity equation, is proposed. Compared with conventional interferometric methods, the optical setup of the proposed method is robust because it does not require additional optical elements. The proposed method achieves phase retrieval by slight modification of the standard CGI setup. Numerical and optical experiments with low SNR confirm the effectiveness of the proposed method. (C) 2018 Optical Society of America

    DOI

  • Correlation-Based Multiplexing of Complex Amplitude Data Pages in a Holographic Storage System Using Digital Holographic Techniques (vol 9, 375, 2017)

    Teruyoshi Nobukawa, Takanori Nomura (担当区分: 最終著者 )

    POLYMERS ( MDPI AG )  9 ( 10 )   2017年10月  [査読有り]

    DOI

  • Object plane detection and phase-amplitude imaging based on transport of intensity equation

    Koshi Komuro, Takanori Nomura (担当区分: 最終著者 )

    OPTICAL REVIEW ( OPTICAL SOC JAPAN )  24 ( 5 ) 626 - 633   2017年10月  [査読有り]

     概要を見る

    By using transport of intensity equation (TIE), phase distribution of an object is retrieved from through-focus intensity images. This technique allows simple and robust phase imaging compared with an interferometric approach. However, it is hard to measure phase distribution when a dynamic object moves in the direction of an optical axis. To clear this problem, autofocusing TIE which is based on local statistics is proposed. The proposed technique achieves the detection of the object plane and the retrieval of a focused object phase distribution simultaneously. In this approach, an object plane is determined by the focusing techniques based on local statistics such as variance, gradient, and Laplacian of amplitude distribution, after phase distribution in an image sensor plane is retrieved by the TIE. The performance of these three statistics is evaluated in numerical and optical experiments, and a suitable focus value is determined for precise phase imaging.

    DOI

  • Refractive index tomography based on optical coherence tomography and tomographic reconstruction algorithm

    Takahiro Kitazawa, Takanori Nomura (担当区分: 最終著者 )

    JAPANESE JOURNAL OF APPLIED PHYSICS ( IOP PUBLISHING LTD )  56 ( 9 )   2017年09月  [査読有り]

     概要を見る

    Refractive index (RI) tomography based on not quantitative phase imaging (QPI) but optical coherence tomography (OCT) is proposed. In conventional RI tomography, the phase unwrapping process deteriorates measurement accuracy owing to the unwrapping error. To eliminate the unwrapping process, the introduction of OCT is proposed, because OCT directly provides optical thickness. The proposed method can improve measurement accuracy owing to the removal of the phase unwrapping error. The feasibility of the method is confirmed by numerical simulations and optical experiments. These results show that the proposed method can reduce measurement errors even when an object shows phase changes much larger than a wavelength. (C) 2017 The Japan Society of Applied Physics

    DOI

  • Orthogonal polarization encoding for reduction of interpixel cross talk in holographic data storage

    Teruyoshi Nobukawa, Daisuke Barada, Takanori Nomura, Takashi Fukuda

    OPTICS EXPRESS ( OPTICAL SOC AMER )  25 ( 19 ) 22425 - 22439   2017年09月  [査読有り]

     概要を見る

    Interpixel cross talk decreases the quality of a reconstructed signal in holographic data storage and imposes a limitation on its storage capacity. To reduce the interpixel cross talk, an orthogonal polarization encoding method is proposed. In the proposed method, the polarization state of each pixel is set to be orthogonal with that of surrounding pixels. This prevents the interference between nearest- neighboring pixels and significantly reduces the gross of the interpixel cross talk. The quality of the data page obtained with the proposed method is numerically and experimentally evaluated. Those results suggest that the proposed method can improve the quality of a reconstructed signal. (C) 2017 Optical Society of America

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  • Generalized sequential four-step phase-shifting color digital holography

    Takanori Nomura, Kazuma Shinomura (担当区分: 筆頭著者, 責任著者 )

    APPLIED OPTICS ( OPTICAL SOC AMER )  56 ( 24 ) 6851 - 6854   2017年08月  [査読有り]

     概要を見る

    A generalized sequential four-step phase-shifting color digital holography is proposed. As an arbitrary phase-shift quantity is independent from wavelengths, it can be used for four-step phase-shifting color digital holography. Furthermore, no constraint on the phase-shifting quantities or statistical property on the hologram is required in the proposed method. Experimental results using a reflective object are shown to confirm the proposed phase-shifting digital holography. (C) 2017 Optical Society of America

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  • Correlation-Based Multiplexing of Complex Amplitude Data Pages in a Holographic Storage System Using Digital Holographic Techniques

    Teruyoshi Nobukawa, Takanori Nomura (担当区分: 最終著者 )

    POLYMERS ( MDPI AG )  9 ( 8 )   2017年08月  [査読有り]

     概要を見る

    Holographic recording media can store the amplitude and the phase, or the complex amplitude, of a beam on the basis of holography. Owing to this characteristic, digital data can be encoded onto the complex amplitude of a signal beam in holographic data storage. However, most of conventional holographic storage systems encode digital data onto the amplitude alone because there are difficulties for modulating and detecting the phase. To solve the difficulties, a holographic storage system using digital holographic techniques has been proposed. With the help of digital holographic techniques, it is possible to modulate and detect the complex amplitude of a signal beam. Moreover, the proposed system can modulate the complex amplitude of a reference beam. In this paper, by making use of the capability, a correlation-based multiplexing with uncorrelated reference beams is demonstrated in the proposed system. Multiple holograms can be recorded in the same volume of a recording medium with no need for mechanical movements. Experimental results show that the proposed system with a correlation-based multiplexing can improve the storage capacity and can utilize the full potential of a recording medium without crosstalk noise stem from the optical setup.

    DOI

  • Spatially incoherent Fourier digital holography by four-step phase-shifting rotational shearing interferometer and its image quality

    Kaho Watanabe, Takanori Nomura (担当区分: 最終著者 )

    OPTICAL REVIEW ( OPTICAL SOC JAPAN )  24 ( 3 ) 351 - 360   2017年06月  [査読有り]

     概要を見る

    Spatially incoherent Fourier digital holography using a rotational shearing interferometer for four-step phase-shifting method is proposed. The previous incoherent Fourier holography using a rotational shearing interferometer [Watanabe and Nomura (Appl. Opt. 54: A18, 2015)] employs the two-step phase-shifting method in the vertical and horizontal polarizations. The reconstructed image contains a large bias term. This paper proposes introduction of two kinds of wave plates in one path of a rotational shearing interferometer for a four-step phase-shifting method. A Fourier hologram is obtained from the four recorded holograms for eliminating the bias term and the twin image. The numerical simulation and the optical experiment demonstrate improvement of the image quality of reconstructed image by the twin image and bias level reduction. Furthermore, the effect of the size of an image sensor on the image quality in rotational shearing interferometer is also investigated by the numerical simulations.

    DOI

  • Shift multiplexing with a spherical wave in holographic data storage based on a computer-generated hologram

    Teruyoshi Nobukawa, Takanori Nomura (担当区分: 最終著者 )

    APPLIED OPTICS ( OPTICAL SOC AMER )  56 ( 13 ) F31 - F36   2017年05月  [査読有り]

     概要を見る

    A holographic data storage system based on a computer-generated hologram (CGH) is simple and compact because a hologram of a data page is recorded through an imaging system without an additional optical path for a reference beam. In this paper, to improve the recording density of the holographic data storage based on a CGH, a shift multiplexing method using a spherical wave is proposed. A data page to be stored and a spherical wave are simultaneously reconstructed from a single CGH. This allows shift multiplexing by displacing a recording medium. Experimental results show that the proposed method can improve shift selectivity and enables us to implement shift multiplexing. (C) 2017 Optical Society of America

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  • Multimodal Imaging Based on Digital Holography

    Osamu Matoba, Xiangyu Quan, Peng Xia, Yasuhiro Awatsuji, Takanori Nomura

    Proceedings of the IEEE ( IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC )  105 ( 5 ) 906 - 923   2017年05月  [査読有り]

     概要を見る

    © 2017 IEEE. Digital holography provides a method of the 3-D recording and numerical reconstruction by a simple optical system and a computer. Quantitative measurement and numerical refocusing are major characteristics. So far, many physical parameters such as amplitude, phase, polarization, fluorescence, and spectra can be obtained independently. Recently, multimodal imaging that can obtain simultaneously two or more physical parameters by combining digital holographic microscope and other optical microscopes such as a fluorescence optical microscope and a Raman scattering microscope has emerged. In this review, physical parametric imaging techniques based on digital holography are presented and then these techniques are enhanced to develop multimodal imaging based on digital holography.

    DOI

  • Digital super-resolution holographic data storage based on Hermitian symmetry for achieving high areal density

    Teruyoshi Nobukawa, Takanori Nomura (担当区分: 最終著者 )

    OPTICS EXPRESS ( OPTICAL SOC AMER )  25 ( 2 ) 1326 - 1338   2017年01月  [査読有り]

     概要を見る

    Digital super-resolution holographic data storage based on Hermitian symmetry is proposed to store digital data in a tiny area of a medium. In general, reducing a recording area with an aperture leads to the improvement in the storage capacity of holographic data storage. Conventional holographic data storage systems however have a limitation in reducing a recording area. This limitation is called a Nyquist size. Unlike the conventional systems, our proposed system can overcome the limitation with the help of a digital holographic technique and digital signal processing. Experimental result shows that the proposed system can record and retrieve a hologram in a smaller area than the Nyquist size on the basis of Hermitian symmetry. (C) 2016 Optical Society of America

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  • Coaxial polarization holographic data recording on a polarization-sensitive medium

    Teruyoshi Nobukawa, Takashi Fukuda, Daisuke Barada, Takanori Nomura (担当区分: 最終著者 )

    OPTICS LETTERS ( OPTICAL SOC AMER )  41 ( 21 ) 4919 - 4922   2016年11月  [査読有り]

     概要を見る

    A coaxial polarization holographic data recording is proposed, and a proof-of-principle experiment is demonstrated for the first time, to the best of our knowledge. A proposed recording system allows us to record and retrieve a volume polarization hologram using a simple optical setup, as compared with conventional polarization holographic data storage systems. By using the proposed system, the data pages encoded on horizontal and vertical linearly polarized beams were simultaneously recorded, and each data page was successfully retrieved without any error. Moreover, the effectiveness of a random phase mask was experimentally and quantitatively confirmed in polarization holographic data storage. (C) 2016 Optical Society of America

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  • Multilevel recording of complex amplitude data pages in a holographic data storage system using digital holography

    Teruyoshi Nobukawa, Takanori Nomura (担当区分: 最終著者 )

    OPTICS EXPRESS ( OPTICAL SOC AMER )  24 ( 18 ) 21001 - 21011   2016年09月  [査読有り]

     概要を見る

    A holographic data storage system using digital holography is proposed to record and retrieve multilevel complex amplitude data pages. Digital holographic techniques are capable of modulating and detecting complex amplitude distribution using current electronic devices. These techniques allow the development of a simple, compact, and stable holographic storage system that mainly consists of a single phase-only spatial light modulator and an image sensor. As a proof-of-principle experiment, complex amplitude data pages with binary amplitude and four-level phase are recorded and retrieved. Experimental results show the feasibility of the proposed holographic data storage system. (C) 2016 Optical Society of America

    DOI

  • Fast Hologram Pattern Generation by Adaptive Point-Spread Spherical Wave Synthesis

    Yutaka Mori, Takanori Nomura (担当区分: 最終著者 )

    JOURNAL OF DISPLAY TECHNOLOGY ( IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC )  12 ( 8 ) 815 - 821   2016年08月  [査読有り]

     概要を見る

    We propose an adaptive point-spread spherical wave synthesis method based on the point-source hologram technique for fast hologram pattern generation. The calculation time of the hologram generation is reduced by decreasing the number of reconstructed point sources composing an object. A larger point source is reconstructed in the area where an object can be partially expressed by low resolution. The point-spread is adjusted corresponding to the spatial frequency of an object. The effectiveness of the proposed method is confirmed by a computer simulation using two-dimensional images.

    DOI

  • Roadmap on optical security

    Bahram Javidi, Artur Carnicer, Masahiro Yamaguchi, Takanori Nomura, Elisabet Perez-Cabre, Maria S. Millan, Naveen K. Nishchal, Roberto Torroba, John Fredy Barrera, Wenqi He, Xiang Peng, Adrian Stern, Yair Rivenson, A. Alfalou, C. Brosseau, Changliang Guo, John T. Sheridan, Guohai Situ, Makoto Naruse, Tsutomu Matsumoto, Ignasi Juvells, Enrique Tajahuerce, Jesus Lancis, Wen Chen, Xudong Chen, Pepijn W. H. Pinkse, Allard P. Mosk, Adam Markman

    JOURNAL OF OPTICS ( IOP PUBLISHING LTD )  18 ( 8 )   2016年08月  [査読有り]

     概要を見る

    Information security and authentication are important challenges facing society. Recent attacks by hackers on the databases of large commercial and financial companies have demonstrated that more research and development of advanced approaches are necessary to deny unauthorized access to critical data. Free space optical technology has been investigated by many researchers in information security, encryption, and authentication. The main motivation for using optics and photonics for information security is that optical waveforms possess many complex degrees of freedom such as amplitude, phase, polarization, large bandwidth, nonlinear transformations, quantum properties of photons, and multiplexing that can be combined in many ways to make information encryption more secure and more difficult to attack. This roadmap article presents an overview of the potential, recent advances, and challenges of optical security and encryption using free space optics. The roadmap on optical security is comprised of six categories that together include 16 short sections written by authors who have made relevant contributions in this field. The first category of this roadmap describes novel encryption approaches, including secure optical sensing which summarizes double random phase encryption applications and flaws [Yamaguchi], the digital holographic encryption in free space optical technique which describes encryption using multidimensional digital holography [Nomura], simultaneous encryption of multiple signals [Perez-Cabre], asymmetric methods based on information truncation [Nishchal], and dynamic encryption of video sequences [Torroba]. Asymmetric and one-way cryptosystems are analyzed by Peng. The second category is on compression for encryption. In their respective contributions, Alfalou and Stern propose similar goals involving compressed data and compressive sensing encryption. The very important area of cryptanalysis is the topic of the third category with two sections: Sheridan reviews phase retrieval algorithms to perform different attacks, whereas Situ discusses nonlinear optical encryption techniques and the development of a rigorous optical information security theory. The fourth category with two contributions reports how encryption could be implemented at the nano- or micro-scale. Naruse discusses the use of nanostructures in security applications and Carnicer proposes encoding information in a tightly focused beam. In the fifth category, encryption based on ghost imaging using single-pixel detectors is also considered. In particular, the authors [Chen, Tajahuerce] emphasize the need for more specialized hardware and image processing algorithms. Finally, in the sixth category, Mosk and Javidi analyze in their corresponding papers how quantum imaging can benefit optical encryption systems. Sources that use few photons make encryption systems much more difficult to attack, providing a secure method for authentication.

    DOI

  • Shack-Hartmann wavefront sensor with large dynamic range by adaptive spot search method

    Hironobu Shinto, Yusuke Saita, Takanori Nomura

    APPLIED OPTICS ( OPTICAL SOC AMER )  55 ( 20 ) 5413 - 5418   2016年07月  [査読有り]

     概要を見る

    A Shack-Hartmann wavefront sensor (SHWFS) that consists of a microlens array and an image sensor has been used to measure the wavefront aberrations of human eyes. However, a conventional SHWFS has finite dynamic range depending on the diameter of the each microlens. The dynamic range cannot be easily expanded without a decrease of the spatial resolution. In this study, an adaptive spot search method to expand the dynamic range of an SHWFS is proposed. In the proposed method, spots are searched with the help of their approximate displacements measured with low spatial resolution and large dynamic range. By the proposed method, a wavefront can be correctly measured even if the spot is beyond the detection area. The adaptive spot search method is realized by using the special microlens array that generates both spots and discriminable patterns. The proposed method enables expanding the dynamic range of an SHWFS with a single shot and short processing time. The performance of the proposed method is compared with that of a conventional SHWFS by optical experiments. Furthermore, the dynamic range of the proposed method is quantitatively evaluated by numerical simulations. (C) 2016 Optical Society of America

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  • Quantitative phase imaging using transport of intensity equation with multiple bandpass filters

    Koshi Komuro, Takanori Nomura (担当区分: 最終著者 )

    APPLIED OPTICS ( OPTICAL SOC AMER )  55 ( 19 ) 5180 - 5186   2016年07月  [査読有り]

     概要を見る

    A phase imaging based on the transport of intensity equation using multiple bandpass filters is proposed. The proposed method enables us to measure a phase distribution quantitatively from through-focus intensity images obtained by using a white light source and multiple bandpass filters. The technique improves the accuracy of a phase measurement by increasing the number of intensity images obtained at different defocused positions. The feasibility of the phase measurement and the improvement in the accuracy with increasing the through-focus images are confirmed by numerical simulations and optical experiments. (C) 2016 Optical Society of America

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  • Linear phase encoding for holographic data storage with a single phase-only spatial light modulator

    Teruyoshi Nobukawa, Takanori Nomura

    APPLIED OPTICS ( OPTICAL SOC AMER )  55 ( 10 ) 2565 - 2573   2016年04月  [査読有り]

     概要を見る

    A linear phase encoding is presented for realizing a compact and simple holographic data storage system with a single spatial light modulator (SLM). This encoding method makes it possible to modulate a complex amplitude distribution with a single phase-only SLM in a holographic storage system. In addition, an undesired light due to the imperfection of an SLM can be removed by spatial frequency filtering with a Nyquist aperture. The linear phase encoding is introduced to coaxial holographic data storage. The generation of a signal beam using linear phase encoding is experimentally verified in an interferometer. In a coaxial holographic data storage system, single data recording, shift selectivity, and shift multiplexed recording are experimentally demonstrated. (C) 2016 Optical Society of America

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  • Speckle Reduction by Spatial-Domain Mask in Digital Holography

    Takahiko Fukuoka, Yutaka Mori, Takanori Nomura

    JOURNAL OF DISPLAY TECHNOLOGY ( IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC )  12 ( 4 ) 315 - 322   2016年04月  [査読有り]

     概要を見る

    The image quality improvement method using a spatial-domain mask is proposed. In the proposed method, a single hologram is required for speckle reduction. The speckle noise of the reconstructed image is suppressed by averaging different speckle patterns. The different speckle patterns are generated by shifting the rectangular aperture in the hologram plane. The experiment results including a modulation transfer function are presented to confirm the performance of the proposed method.

    DOI

  • Multilayer recording holographic data storage using a varifocal lens generated with a kinoform

    Teruyoshi Nobukawa, Takanori Nomura

    OPTICS LETTERS ( OPTICAL SOC AMER )  40 ( 23 ) 5419 - 5422   2015年12月  [査読有り]

     概要を見る

    A multilayer recording method using a varifocal lens generated with a kinoform is presented. In this recording method, a focus position is axially displaced by adding a defocus phase to a phase modulation pattern, which consists of a random phase mask and a computer-generated reference pattern. Shift selectivity and multiplexed recording are experimentally investigated in coaxial holographic data storage. Experimental results show that the proposed method allows the recording of holograms along an optical axis without any mechanical movement. (C) 2015 Optical Society of America

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  • Extended focused imaging in digital holography by spatial-domain mask method

    Yutaka Mori, Takahiko Fukuoka, Takanori Nomura

    JOURNAL OF OPTICS ( IOP PUBLISHING LTD )  17 ( 12 )   2015年12月  [査読有り]

     概要を見る

    In a digital holographic reconstruction, only images located at the reconstruction distance are in focus. A speckle reduction technique is proposed to improve digital holographic in-focus imaging. The extended focused image is obtained from a depth map created by evaluating the edge sharpness of object images. In order to show the performance and effectiveness of the proposed technique for extended focused imaging, we conducted the demonstration experiments using two objects, which are a resolution chart and two screws.

    DOI

  • Preface

    Takanori Nomura

    OPTICAL REVIEW ( OPTICAL SOC JAPAN )  22 ( 5 ) 828 - 828   2015年10月  [査読有り]

    DOI

  • Speckle Reduction in Hologram Generation Based on Spherical Waves Synthesis Using Low-Coherence Digital Holography

    Yutaka Mori, Takanori Nomura

    JOURNAL OF DISPLAY TECHNOLOGY ( IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC )  11 ( 10 ) 867 - 872   2015年10月  [査読有り]

     概要を見る

    A speckle reduction method based on a spherical waves synthesis with low-coherence digital holography for hologram generation is proposed. An object information is experimentally obtained from a number of recorded low-coherence digital holograms. A hologram is generated by synthesizing the fields of spherical waves with the obtained information. The performance of the proposed method as hologram generation from a distribution contained spike noises like speckles is confirmed. The image quality is evaluated by the speckle contrast of the reconstructed image.

    DOI

  • Digital holographic three-dimensional Mueller matrix imaging

    Toshitaka Kobata, Takanori Nomura

    APPLIED OPTICS ( OPTICAL SOC AMER )  54 ( 17 ) 5591 - 5596   2015年06月  [査読有り]

     概要を見る

    A digital holographic Mueller matrix imaging method is proposed. A Mueller matrix is obtained from Stokes vectors that are calculated from the complex amplitude of the two orthogonal polarized lights. The complex amplitude is obtained by digital holography. In the proposed method, three-dimensional Mueller matrix imaging is achieved by 12 recordings. Optical experimental results confirm the feasibility of the proposed method by measuring the Mueller matrices of four linear polarizers, a quarter-wave plate, and two linear polarizers placed at different positions. (C) 2015 Optical Society of America

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  • Multiplexed recording with uncorrelated computer-generated reference patterns in coaxial holographic data storage

    Teruyoshi Nobukawa, Yotaro Wani, Takanori Nomura

    OPTICS LETTERS ( OPTICAL SOC AMER )  40 ( 10 ) 2161 - 2164   2015年05月  [査読有り]

     概要を見る

    A computer-generated reference pattern (CGRP) allows improvement in light efficiency and the quality of reconstructed data in coaxial holographic data storage. In this Letter, a multiplexed recording method with uncorrelated CGRPs is proposed. With this method, crosstalk from adjacent holograms is suppressed without shifting a medium. To confirm the feasibility of the proposed method experimentally, shift selectivity is investigated, and then multiplexed recording is performed. Experimental results show that the proposed method enables high-density recording compared with conventional shift multiplexing. In addition, a theoretical analysis implies that at least 100 uncorrelated CGRPs can be designed and used for multiplexed recording. (C) 2015 Optical Society of America

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  • Holographic Shack-Hartmann wavefront sensor based on the correlation peak displacement detection method for wavefront sensing with large dynamic range

    Yusuke Saita, Hironobu Shinto, Takanori Nomura

    OPTICA ( OPTICAL SOC AMER )  2 ( 5 ) 411 - 415   2015年05月  [査読有り]

     概要を見る

    A method to expand the dynamic range for a Shack - Hartmann wavefront sensor (SHWFS) is proposed. An SHWFS consists of a microlens array and an image sensor, and it has been widely used to measure the wavefront aberration of a lightwave in various fields. However, a very large aberrated wave cannot be correctly measured due to the finite dynamic range that depends on the diameter of each microlens. The proposed method enables an SHWFS to measure wavefronts with larger aberrations by applying holography and pattern matching technologies. For measurement of a spherical wave, the proposed method is compared with a conventional one by numerical simulations and optical experiments. Their results confirm the performance of the proposed method. (C) 2015 Optical Society of America

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  • Recording spatially incoherent Fourier hologram using dual channel rotational shearing interferometer

    Kaho Watanabe, Takanori Nomura

    APPLIED OPTICS ( OPTICAL SOC AMER )  54 ( 1 ) A18 - A22   2015年01月  [査読有り]

     概要を見る

    The method to record an incoherent Fourier hologram is proposed. The interference patterns in the dual channel rotational shearing interferometer are obtained as the figure of the cosine and the sine transformation in the vertical and the horizontal polarization, respectively. The proposed optical system is simple without spatial light modulators or mechanical phase shifting devices. The experiment, in which the letter "A" displayed on a liquid crystal display with a blue LED backlight was used as an object, confirms the proposed method to obtain an incoherent Fourier hologram. (C) 2014 Optical Society of America

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  • Reconstruction of incoherent Fresnel-like hologram by a rotational shearing interferometer

    Kaho Watanabe, Takanori Nomura

    INTERNATIONAL CONFERENCE ON PHOTONICS SOLUTIONS 2015 ( SPIE-INT SOC OPTICAL ENGINEERING )  9659   2015年  [査読有り]

     概要を見る

    The systems to record incoherent holograms using a rotational shearing interferometer is demonstrated. The systems can record incoherent holograms by self-interference of the two coherent object points created by the beam splitter from one object point. In general, the rotational shearing interferometer cannot reproduce any depth information. The proposed rotational shearing interferometer has the advantage of obtaining depth information by the reconstruction owing to lenses for the shear which is parallel to the optical axis. A preliminary experiments were performed. The object images at some reconstruction distances were reconstructed numerically. The experimental results confirm the proposed system.

    DOI

  • Expansion of dynamic range in Shack-Hartmann wavefront sensor using dual microlens array

    Hironobu Shinto, Yusuke Saita, Takanori Nomura

    BIOPHOTONICS JAPAN 2015 ( SPIE-INT SOC OPTICAL ENGINEERING )  9792   2015年  [査読有り]

     概要を見る

    A Shack-Hartmann wavefront sensor (SHWFS) which consists of a microlens array and an image sensor has been used to measure the wavefront aberrations in various fields owing to its advantages such as simple configuration. However, a conventional SHWFS has the finite dynamic range. The dynamic range cannot be expanded without sacrificing the spatial resolution and the sensitivity in a conventional SHWFS. In this study, the SHWFS using a dual microlens array to solve the problem is proposed. In the proposed method, an astigmatic microlens is arranged at the center of a group of 2 x 2 spherical microlenses. A pattern image including spots and linear patterns is obtained at the focal plane by the dual microlens array. The pattern image can be separated into two images as if two microlens array with different diameter were used by discriminating spots from linear patterns with the pattern matching technique. The proposed method enables to expand the dynamic range of an SHWFS by using the separated two images. The performance of the proposed method is confirmed by the numerical simulation for measuring a spherical wave.

    DOI

  • Image quality improvement of digital holography by use of various rectangle apertures

    Takanori Nomura, Takahiko Fukuoka, Yutaka Mori

    OPTICS AND PHOTONICS FOR INFORMATION PROCESSING IX ( SPIE-INT SOC OPTICAL ENGINEERING )  9598   2015年  [査読有り]

     概要を見る

    Digital holography is a useful technique for recording the fully complex field of a wavefront. However, the quality of a reconstructed image of a digital hologram is not good, because it is suffering from speckles. To improve the image quality, a speckle reduction method in digital holography using various rectangular apertures is proposed. Different-sized rectangular apertures are applied for the hologram. Furthermore, the position of the aperture is arbitrary. Owing to the various size and position, the generated speckles have the various sizes and patterns. By averaging the speckle, the speckle noise can be reduced. Some reconstructed images based on the experimental results are shown to confirm the proposed method. For quantitative evaluation, the speckle contrast is also shown.

    DOI

  • Single-exposure generalized phase-shifting digital holography

    Takanori Nomura, Masatoshi Imbe

    2015 14TH WORKSHOP ON INFORMATION OPTICS (WIO) ( IEEE )    2015年  [査読有り]

     概要を見る

    As one of the wave-splitting phase-shifting digital holography, single-exposure generalized phase-shifting digital holography has been proposed. In the digital holography, the phase-shift quantity, which corresponds to the difference between the phase quantities of the reference wave on the adjacent pixels, is not restricted but generalized. Owing to the generalized phase-shifting, a random-phase wave as the reference wave can be used. The proposed phase-shifting digital holography enables us to record a fully-complex field of a dynamic phenomena without dc and conjugate terms using a commercially available optical devices. Constraints on the reference wave and the object wave suitable for the phase-shifting digital holography are introduced. Experimental results are presented to confirm the constraints.

  • Numerical evaluation of multilayer holographic data storage with a varifocal lens generated with a spatial light modulator

    Teruyoshi Nobukawa, Takanori Nomura

    OPTICAL DATA STORAGE 2015 ( SPIE-INT SOC OPTICAL ENGINEERING )  9587   2015年  [査読有り]

     概要を見る

    A multilayer recording using a varifocal lens generated with a phase-only spatial light modulator (SLM) is proposed. A phase-only SLM is used for not only improving interference efficiency between signal and reference beams but also shifting a focus plane along an optical axis. A focus plane can be shifted by adding a spherical phase to a phase modulation pattern displayed on a phase-only SLM. A focal shift with adding a spherical phase was numerically confirmed. In addition, shift selectivity and recording performance of the proposed multilayer recording method were numerically evaluated in coaxial holographic data storage.

    DOI

  • Recording a Phase Data Page in Super-Resolution Holographic Data Storage for High Light Efficiency

    Teruyoshi Nobukawa, Takanori Nomura

    2015 14TH WORKSHOP ON INFORMATION OPTICS (WIO) ( IEEE )    2015年  [査読有り]

     概要を見る

    Super-resolution holographic data storage allows us to record and retrieve a data page with a smaller aperture than a Nyquist aperture. This system has a potential to realize a high-density recording compared with a conventional holographic storage system. Recording a phase data page in super-resolution holographic data storage to improve light efficiency is proposed. The phase data page is designed for the super-resolution holographic data storage to suppress the zero-order beam of a signal beam in a Fourier plane. The numerical experiments show the feasibility of the proposed method.

  • Incoherent holography to obtain depth information by a rotational shearing interferometer

    Kaho Watanabe, Takanori Nomura

    OPTICS AND PHOTONICS FOR INFORMATION PROCESSING IX ( SPIE-INT SOC OPTICAL ENGINEERING )  9598   2015年  [査読有り]

     概要を見る

    The system to record incoherent holograms using a rotational shearing interferometer is proposed. It enables us to record a hologram without coherent illumination such as a laser. The systems can record an incoherent hologram by self-interference. A rotational shearing interferometer to record incoherent cosine hologram is described. Furthermore, a rotational shearing interferometer with lenses to record incoherent hologram is described. It has the advantage of obtaining depth information by the reconstruction owing to lenses for the shear which is parallel to the optical axis. The preliminary experiments were performed. An LED and a liquid crystal display with an LED backlight were used as incoherent objects. The incoherent holograms were recorded. The object images were reconstructed numerically. The experimental results confirm the proposed incoherent holography using a rotational shearing interferometer.

    DOI

  • Recording Spatially Incoherent Hologram Using Rotational Shearing Interferometer with a Lens for the Parallel Shear

    Kaho Watanabe, Takanori Nomura

    2015 14TH WORKSHOP ON INFORMATION OPTICS (WIO) ( IEEE )    2015年  [査読有り]

     概要を見る

    Incoherent holography enables us to use a spatially incoherent illumination for recording holograms. In this paper, we describe incoherent holograms which can be recorded by the optical setups based on the rotational shearing interferometer. The experiment in which a LED was used an incoherent object confirms obtaining the holograms as the figures of a cosine transformation and a Fresnel zone-like pattern.

  • Wavefront Measurement with Large Dynamic Range Using Holographic Shack-Hartmann Wavefront Sensor

    Yusuke Saita, Hironobu Shinto, Takanori Nomura

    2015 14TH WORKSHOP ON INFORMATION OPTICS (WIO) ( IEEE )    2015年  [査読有り]

     概要を見る

    The proposed holographic Shack-Hartmann wavefront sensor can measure a wavefront aberration with large dynamic range. It is realized by introducing a holographic optical element and pattern matching technique. To confirm the flexibility of the sensor, measurements of the wavefronts with various aberrations are numerically demonstrated.

  • Speckle reduction in holographic projection by random pixel separation with time multiplexing

    Yutaka Mori, Takahiko Fukuoka, Takanori Nomura

    APPLIED OPTICS ( OPTICAL SOC AMER )  53 ( 35 ) 8182 - 8188   2014年12月  [査読有り]

     概要を見る

    A speckle-reduction method with random locations of sparse object points is proposed for image quality improvement based on a time-multiplexing approach in holographic reconstruction. The object points of a reconstructed image are divided into groups of sparse object points. Pixel separation of the periodic location, in general, is used for the sparse object points. However, an unwanted periodic fringe pattern is caused, and it dominantly degrades the reconstructed image quality. The proposed random pixel separation enables the reconstructed image quality to improve more effectively. The numerical simulation and the optical experiment are presented to confirm the performance of the proposed method. (C) 2014 Optical Society of America

    DOI

  • Single-shot three-dimensional shape measurement by low-coherent optical path difference digital holography

    Yuji Tanaka, Yutaka Mori, Takanori Nomura

    APPLIED OPTICS ( OPTICAL SOC AMER )  53 ( 27 ) G19 - G24   2014年09月  [査読有り]

     概要を見る

    A single-shot three-dimensional (3D) shape measurement by low-coherent optical path difference digital holography with small energy consumption is proposed. The use of a superluminescent diode makes it possible. Weighting of the single hologram and numerical reconstruction give the 3D shape of an object. Experimental results using a simple object (the surface of a button cell battery) are given. By comparison with experimental results using a vertical scanning method, the proposed method is confirmed. The effects of a shift interval of the hologram and a zero-order component on a measurement result are also discussed. (C) 2014 Optical Society of America

    DOI

  • Design method of input phase mask to improve light use efficiency and reconstructed image quality for holographic memory

    Yusuke Saita, Takanori Nomura

    APPLIED OPTICS ( OPTICAL SOC AMER )  53 ( 19 ) 4136 - 4140   2014年07月  [査読有り]

     概要を見る

    A design method of an input phase mask for holographic memory is proposed. In the method, a modification of a design procedure and another restraint condition are applied to our conventional design method. The light use efficiency and the quality of a reconstructed image are improved. The performance of an input phase mask designed by the method is confirmed by numerical simulations. Finally, a suitable design condition of an input phase mask is determined from simulation results. (C) 2014 Optical Society of America

    DOI

  • Design of high-resolution and multilevel reference pattern for improvement of both light utilization efficiency and signal-to-noise ratio in coaxial holographic data storage

    Teruyoshi Nobukawa, Takanori Nomura

    APPLIED OPTICS ( OPTICAL SOC AMER )  53 ( 17 ) 3773 - 3781   2014年06月  [査読有り]

     概要を見る

    A high-resolution and multilevel designed reference pattern (DRP) is presented for improvement of both light utilization efficiency and the signal-to-noise ratio (SNR) of reconstructed images in coaxial holographic data storage. With a DRP, the desired Fourier power spectrum of a reference beam is obtained. Numerical and experimental results show that the DRP increases the SNR compared with that of a random phase mask (RPM). Moreover, the light utilization efficiency of the DRP is higher than that of a high-resolution RPM. In addition, the effect of the phase level and the pixel pitch of DRPs on the SNR and the light utilization efficiency are investigated. (C) 2014 Optical Society of America

    DOI

  • Selective calculation for the improvement of reconstructed images in single-exposure generalized phase-shifting digital holography

    Masatoshi Imbe, Takanori Nomura

    OPTICAL ENGINEERING ( SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS )  53 ( 4 )   2014年04月  [査読有り]

     概要を見る

    Single-exposure generalized phase-shifting digital holography enables one to remove the zerothorder and conjugate terms from the single hologram. For the phase-shifting, a random-complex-amplitude encoded wave is used as the reference wave. This encoded wave can be made by a commercially available element. Selective calculation is proposed for the improvement of reconstructed images in single-exposure generalized phase-shifting digital holography. Three calculations are used as a function of the complex amplitude quantities of the reference wave on the each pixel of the image sensor. The selective calculation improves the quality of the reconstructed image compared with applying only one of the three calculations to the hologram. The derivation of the three calculations and the reason why the number of calculations is three are presented. A parameter is defined and used to select the appropriate calculation from the three calculations. Relationships between the proposed method and the previous method for the improvement of the reconstructed images in single-exposure generalized phase-shifting digital holography are discussed. Two kinds of experimental results are given to confirm the effectiveness of the proposed method. One shows the dependence on the speckle size of the reference wave. The other shows the feasibility to dynamic phenomena. (C) 2014 Society of Photo-Optical nstrumentation Engineers (SPIE)

    DOI

  • Simultaneous measurement of refractive index and thickness distributions using low-coherence digital holography and vertical scanning

    Kaho Watanabe, Masashi Ohshima, Takanori Nomura

    JOURNAL OF OPTICS ( IOP PUBLISHING LTD )  16 ( 4 )   2014年04月  [査読有り]

     概要を見る

    The simultaneous measurement method of a refractive index distribution and a thickness distribution using low-coherence digital holography with a vertical scanning is proposed. The proposed method consists of a combination of digital holography and low-coherence interferometry. The introduction of a datum plane enables the measurement of both a refractive index distribution and a thickness distribution. By the optical experiment, the potential of the proposed method is confirmed.

    DOI

  • Shortening method for optical reconstruction distance in digital holographic display with phase hologram

    Mori Yutaka, Nomura Takanori

    OPTICAL ENGINEERING ( SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS )  52 ( 12 )   2013年12月  [査読有り]

     概要を見る

    We present a method to solve a distance issue. In digital holography, the reconstruction distance is different from the original one because of the difference of the pixel size between an imaging device and a display device. In general, the distance is larger because the pixel size of the display is larger than that of the imaging device. This makes it hard to recognize perception of the stereoscopic effect when holographic reconstructed images are used for the stereopsis system. Typically, a numerical propagation method and a spherical phase addition are used to shorten the distance. However, each method is not shortened enough. To clear the criterion, the limitation of each method is verified. By combining two methods, the reconstruction distance is shortened from 4440 to 547 mm. In addition, it is successfully shown that the proposed combining method is useful for the stereopsis by visual perception evaluation. (C) 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)

    DOI

  • Coaxial Holographic Memory with Designed Reference Pattern on the Basis of Nyquist Aperture for High Density Recording

    Teruyoshi Nobukawa, Takanori Nomura

    JAPANESE JOURNAL OF APPLIED PHYSICS ( IOP PUBLISHING LTD )  52 ( 9 )   2013年09月  [査読有り]

     概要を見る

    We propose the designed reference pattern on the basis of the Nyquist aperture for a coaxial holographic memory and investigate its recording performance by numerical simulations. By using the designed reference pattern, the Fourier power spectrum of a reference beam spreads uniformly within the Nyquist aperture, thereby an interference efficiency, a signal-to-noise ratio (SNR) and a symbol error rate (SER) are improved relative to conventional method with a random binary phase mask. Moreover, in the case of applying the 1.25 times aperture than the Nyquist size, the proposed method can record data pages with higher SNR and lower SER than that of conventional method with 2 times aperture than the Nyquist size. Numerical results imply that our proposed method can record data pages at a smaller area of recording media than that of conventional method. (c) 2013 The Japan Society of Applied Physics

    DOI

  • Synthesis method from low-coherence digital holograms for improvement of image quality in holographic display

    Mori Yutaka, Nomura Takanori

    APPLIED OPTICS ( OPTICAL SOC AMER )  52 ( 16 ) 3838 - 3844   2013年06月  [査読有り]

     概要を見る

    In holographic displays, it is undesirable to observe the speckle noises with the reconstructed images. A method for improvement of reconstructed image quality by synthesizing low-coherence digital holograms is proposed. It is possible to obtain speckleless reconstruction of holograms due to low-coherence digital holography. An image sensor records low-coherence digital holograms, and the holograms are synthesized by computational calculation. Two approaches, the threshold-processing and the picking-a-peak methods, are proposed in order to reduce random noise of low-coherence digital holograms. The reconstructed image quality by the proposed methods is compared with the case of high-coherence digital holography. Quantitative evaluation is given to confirm the proposed methods. In addition, the visual evaluation by 15 people is also shown. (C) 2013 Optical Society of America

    DOI

  • Study of reference waves in single-exposure generalized phase-shifting digital holography

    Masatoshi Imbe, Takanori Nomura

    APPLIED OPTICS ( OPTICAL SOC AMER )  52 ( 18 ) 4097 - 4102   2013年06月  [査読有り]

     概要を見る

    The appropriate reference wave in single-exposure phase-shifting digital holography using a random-complex-amplitude encoded reference wave is experimentally investigated. Although the reference wave is generalized, the quality of reconstructed images depends on it. Furthermore, when the reference wave satisfies a certain condition, reconstructed images cannot be obtained in this method. After the certain condition is presented, the appropriate condition is studied using a speckle property. Experimental results are given to investigate the relations between the quality of reconstructed images and the sizes of speckles of the reference waves. The results prove that the appropriate reference wave exists in this method. (C) 2013 Optical Society of America

    DOI

  • Single-exposure phase-shifting digital holography using a random-complex-amplitude encoded reference wave

    Masatoshi Imbe, Takanori Nomura

    APPLIED OPTICS ( OPTICAL SOC AMER )  52 ( 1 ) A161 - A166   2013年01月  [査読有り]

     概要を見る

    The improved single-exposure phase-shifting digital holography using a random-phase reference wave is proposed. The algorithm for obtaining a complex amplitude of an object wave is improved. In the proposed algorithm, the reference wave is treated as not a random-phase but a random-complex amplitude. Therefore, the algorithm uses proper amplitude information of the reference wave. Both numerical simulations and experimental results are given to confirm the effectiveness of the proposed algorithm. (C) 2012 Optical Society of America

    DOI

  • Digital holographic tomography using a light back propagation method and its application for refractive index measurement

    Nomura Takanori, Kitazawa Takahiro

    OPTICS AND PHOTONICS FOR INFORMATION PROCESSING VII ( SPIE-INT SOC OPTICAL ENGINEERING )  8855   2013年  [査読有り]

     概要を見る

    A lensless digital holographic tomography using not a filtered back projection method but a light back propagation method is proposed. In the proposed method, the phase distribution on the detector is used for a light propagation. On the contrary, in the conventional method, the phase information is used for a back projection. Owing to the propagation, the deflection from a true optical path is reduced in the proposed method. For the measurement of a specimen with a huge refraction angle, it is shown that our proposed method improves on measurement accuracy compared with a conventional filtered back projection method. Numerical simulations are given to confirm the feasibility of the proposed method.

    DOI

  • Refractive Index & Physical Thickness Distributions Measurement and Consideration of Dependence of Measurement Accuracy on Scanning Interval Using Low-Coherence Digital Holography

    Kaho Watanabe, Takanori Nomura

    2013 IEEE/SICE INTERNATIONAL SYMPOSIUM ON SYSTEM INTEGRATION (SII) ( IEEE )    586 - 591   2013年  [査読有り]

     概要を見る

    The measurement method of a refractive index distribution and a physical thickness distribution using digital holography with a low-coherent light source is proposed. The introduction of a datum plane enables the simultaneous measurement of a refractive index and a physical thickness distributions. By the optical experiments, the potential of the proposed method is confirmed. For the reduction of measurement time, the relation between stepping intervals of a reference mirror and measurement results are also discussed.

  • Design of Reference Pattern and Input Phase Mask for Coaxial Holographic Memory

    Yusuke Saita, Takanori Nomura, Eiji Nitanai, Takuhisa Numata

    JAPANESE JOURNAL OF APPLIED PHYSICS ( JAPAN SOC APPLIED PHYSICS )  50 ( 9 )   2011年09月  [査読有り]

     概要を見る

    Design methods of a reference pattern and an input phase mask for a coaxial holographic memory are described. By the proposed method, it is expected that the useless consumption of the dynamic range of a recording medium will decrease, and the light efficiency and the interference efficiency between the signal beam and the reference beam will be improved. A reference pattern and an input phase mask are designed by a simulated annealing. The performance of the proposed design method is confirmed by numerical simulations and optical experiments. Furthermore, the holographic memory system using both the designed reference pattern and the designed input phase mask is also confirmed by numerical simulations and optical experiments. (C) 2011 The Japan Society of Applied Physics

    DOI

  • Single-shot phase-shifting digital holography using a conventional camera

    Takanori Nomura

    2011 ICO International Conference on Information Photonics, IP 2011     2011年  [査読有り]

     概要を見る

    A single-shot digital holography using a generalized wave-splitting phase-shifting method is introduced. The complex-amplitude encoded reference wave is used for hologram recording. The method enables us to use an ordinary camera to record a phase-shifted digital hologram. Some computational/ experimental results are given to confirm the method. © 2011 IEEE.

    DOI

  • Single-exposure phase-shifting digital holography using a random-phase reference wave

    Takanori Nomura, Masatoshi Imbe

    OPTICS LETTERS ( OPTICAL SOC AMER )  35 ( 13 ) 2281 - 2283   2010年07月  [査読有り]

     概要を見る

    We propose a single-exposure phase-shifting digital holography based on a wave-splitting method using a random-phase reference wave. A random-phase reference wave gives random-phase distribution on the digital hologram. Using the amplitude and the phase distributions of the reference wave, the fully complex amplitude of the object wave is obtained. The proposed method requires not devised optical systems but ordinary imaging devices, such as CCD cameras. A preliminary experimental result is given to confirm the proposed method. (C) 2010 Optical Society of America

    DOI

  • Dynamic recording of a digital hologram with single exposure by a wave-splitting phase-shifting method

    Hiroyuki Suzuki, Takanori Nomura, Eiji Nitanai, Takuhisa Numata

    OPTICAL REVIEW ( OPTICAL SOC JAPAN )  17 ( 3 ) 176 - 180   2010年05月  [査読有り]

     概要を見る

    The wave-splitting phase-shifting digital holography using a pixelated microretarder array is proposed. By using four intensity images recorded by the pixelated microretarder array, Stokes parameters of the incident wave can be calculated. The fully complex amplitude distribution of the object wave can be obtained by using Stokes parameters, if the polarization states of the object and reference waves are linear and orthogonal. Two sets of experimental results are provided to verify the feasibility of the proposed method. One is the result for a movie recording using a CW laser and the other is the result for instant recording using a single pulsed laser.

    DOI

  • Improvement of Viewing-Zone Angle and Image Quality of Digital Holograms

    Takanori Nomura

    2009 INTERNATIONAL WORKSHOP ON INFORMATION OPTICS ( IOP PUBLISHING LTD )  206   2010年  [査読有り]

     概要を見る

    The method to improve of a viewing-zone angle and an image quality of a digital hologram is presented. A number of digital holograms of a central object are recorded from the position on the circumference. The holograms are used for a hologram synthesis to improve the image quality from whole viewing-zone angle. The synthesis is achieved by a correlation between a hologram and numerically propagated holograms. The large-sized synthesized digital hologram has a wide viewing-zone angle and less speckles. Some experimental results are shown to confirm the proposed method.

    DOI

  • Single-Exposure Digital Holography by a Generalized Wave-Splitting Phase-Shifting Method

    Takanori Nomura

    2010 9TH EURO-AMERICAN WORKSHOP ON INFORMATION OPTICS ( IEEE )    2010年  [査読有り]

     概要を見る

    A single-exposure generalized phase-shifting digital holography based on a wave-splitting method. A phase-encoded reference wave is used for phase-shifting. Using the known amplitude and phase distributions of the reference wave, the fully complex amplitude of the object wave is obtained. The proposed method requires not devised optical systems but ordinary imaging devices, such as CCD cameras. A preliminary experimental results with a spherical wave and a random phase wave as reference waves are given to confirm the proposed method.

  • Polarization imaging of a 3D object by use of digital holography and its application

    Takanori Nomura, Bahram Javidi

    THREE-DIMENSIONAL IMAGING, VISUALIZATION, AND DISPLAY 2010 AND DISPLAY TECHNOLOGIES AND APPLICATIONS FOR DEFENSE, SECURITY, AND AVIONICS IV ( SPIE-INT SOC OPTICAL ENGINEERING )  7690   2010年  [査読有り]

     概要を見る

    A polarimetric imaging method of a 3D object by use of on-axis phase-shifting digital holography is presented. The polarimetric image results from a combination of two kinds of holographic imaging using orthogonal polarized reference waves. Experimental demonstration of a 3D polarimetric imaging is presented. Pattern recognition by use of polarimetric phase-shifting digital holography is also presented. Using holography, the amplitude and phase difference distributions between two orthogonal polarizations of 3D phase objects are obtained. This information contains both complex amplitude and polarimetric characteristics of the object, and it can be used for improving the discrimination capability of object recognition. Preliminary experimental results are presented to demonstrate the idea.

    DOI

  • Optical Techniques for Information Security

    Osamu Matoba, Takanori Nomura, Elisabet Perez-Cabre, Maria S. Millan, Bahram Javidi

    PROCEEDINGS OF THE IEEE ( IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC )  97 ( 6 ) 1128 - 1148   2009年06月  [査読有り]

     概要を見る

    This paper presents an overview of the potential of free space optical technology in information security, encryption, and authentication. Optical waveform posses many degrees of freedom such as amplitude, phase, polarization, spectral content, and multiplexing which can be combined in different ways to make the information encoding more secure. This paper reviews optical techniques for encryption and security of two-dimensional and three-dimensional data. Interferometric methods are used to record and retrieve data by either optical or digital holography for security applications. Digital holograms are widely used in recording and processing three dimensional data, and are attractive for securing three dimensional data. Also, we review optical authentication techniques applied to ID tags with visible and near infrared imaging. A variety of images and signatures, including biometrics, random codes, and primary images can be combined in an optical ID tag for security and authentication.

    DOI

  • Polarimetric imaging of 3-D object by use of wavefront-splitting phase-shifting digital holography

    Takanori Nomura, Bahram Javidi

    Three-Dimensional Imaging, Visualization, and Display ( Springer US )    333 - 344   2009年  [査読有り]

     概要を見る

    A polarimetric imaging method of a 3-D object by use of wavefront-splitting phase-shifting digital holography is presented. Phase-shifting digital holography with a phase difference between orthogonal polarizations is used. The use of orthogonal polarizations can make it possible to record two phase-shifted holograms simultaneously if we use pixelated polarimetric optical elements. By combining the holograms with the distributions of a reference wave and an object wave, the complex field of the object wavefront can be obtained. The polarimetric image results from a combination of two kinds of holographic imaging using orthogonal polarized reference waves. An experimental demonstration of a 3-D polarimetric imaging is presented. © 2009 Springer-Verlag New York.

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  • Image quality improvement of digital holography by superposition of reconstructed images obtained by multiple wavelengths

    Takanori Nomura, Mitsukiyo Okamura, Eiji Nitanai, Takuhisa Numata

    Appl. Opt. ( OPTICAL SOC AMER )  47 ( 19 ) D38 - D43   2008年07月  [査読有り]

     概要を見る

    A method to improve the image quality of a digital holographic reconstructed image by means of speckle reduction is proposed. The size and position of the speckles are changed according to the wavelengths to record a digital hologram. By superposing reconstructed images with different wavelengths, the effect of speckle is reduced so that the image quality is improved. Optical experiments are given to confirm the proposed method. (c) 2008 Optical Society of America

    DOI

  • Wave-splitting phase-shifting digital holography by use of a retarder array

    Takanori Nomura, Eiji Nitanai, Takuhisa Numata

    2007 IEEE LEOS ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS 1 AND 2 ( IEEE )    82 - 83   2007年  [査読有り]

     概要を見る

    The phase-shifting digital holography by use of a micro-retarder array is proposed. The micro-retarder array consists of four kinds of different directions of fast axes. The combination of the micro-retarder array and a polarizer gives us the four intensity distributions corresponding to the direction of the fast axes. From four intensity images,we can calculate Stokes parameters of the incident wave. Furthermore, we can obtain fully-complex amplitude distribution of the object wave by using Stokes parameters, if the both polarization states of the object wave and the reference wave are linear and they are orthogonal. Some experimental results are given to confirm our proposed recording method.

    DOI

  • Polarimetric imaging of a three-dimensional object by use of digital holography

    Takanori Nomura, Bahram Javidi, Shinji Murata, Eiji Nitanai, Takuhisa Numata

    AIP Conference Proceedings   949   107 - 113   2007年  [査読有り]

     概要を見る

    A polarimetric imaging method of a 3D object by use of digital holography is presented. The phase-shifitng digital holography using orthogonal polarization is adopted. The polarimetric image results from a combination of two kinds of holographic imaging using orthogonal polarized reference waves. Experimental demonstration of a 3D polarimetric imaging is presented. © 2007 American Institute of Physics.

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  • Phase-shifting digital holography with a phase difference between orthogonal polarizations

    Takanori Nomura, Shinji Murata, Eiji Nitanai, Takuhisa Numata

    APPLIED OPTICS ( OPTICAL SOC AMER )  45 ( 20 ) 4873 - 4877   2006年07月  [査読有り]

     概要を見る

    Phase-shifting digital holography with a phase difference between orthogonal polarizations is proposed. The use of orthogonal polarizations can make it possible to record two phase-shifted holograms simultaneously. By combining the holograms with the distributions of a reference wave and an object wave, the complex field of the object's wavefront can be obtained. Preliminary experimental results are shown to confirm the proposed method. (C) 2006 Optical Society of America.

    DOI

  • One-shot digital holography by use of polarization

    Takanori Nomura, Bahram Javidi, Shinji Murata, Eiji Nitanai, Takuhisa Numata

    OPTICAL INFORMATION SYSTEMS IV ( SPIE-INT SOC OPTICAL ENGINEERING )  6311   2006年  [査読有り]

     概要を見る

    The one-shot phase-shifting digital holography using phase difference of orthogonal polarizations is proposed. Using a CCD camera with pixelated polarizers, three images for phase analysis can be obtained simultaneously. The proposed method can be applied to a moving object, because a complex field of the wavefront of a 3D object can be obtained in a single exposure.

    DOI

  • Design of an input phase mask of the optical encryption system and its application to certification

    Takanori Nomura, Eiji Ninatai, Takuhisa Numata

    INFORMATION OPTICS ( AMER INST PHYSICS )  860   481 - +   2006年  [査読有り]

     概要を見る

    The secure optical memory system based on a double-random phase-encoding optical encryption system is proposed. The quality of decrypted data can be improved by designing an input phase mask to utilize the bandwidth the bandwidth of the optical system effectively. We propose the certification method of the data recorded into the optical memory by using a designed input phase mask as a phase code. Computer simulations confirm the possibility of the proposed certification system.

  • Speckles removal in digital holography using multiple wavelengths/distances from an object

    Takanori Nomura, Mitsukiyo Okamura, Eiji Nitanai, Takuhisa Numata

    2006 IEEE LEOS ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS 1 AND 2 ( IEEE )    74 - +   2006年  [査読有り]

     概要を見る

    The method to reduce speckles in a reconstructed image of a digital hologram is proposed. The size and position of the speckles are changed according to both the wavelengths to be recorded and the distances from the object the hologram. The superposition of the reconstructed images recorded with different wavelength/distance holograms gives the image with reduced speckles.

    DOI

  • Deformation measurement by phase-shifting digital holography

    Y Morimoto, T Nomura, M Fujigaki, S Yoneyama, Takahashi, I

    EXPERIMENTAL MECHANICS ( SPRINGER )  45 ( 1 ) 65 - 70   2005年02月  [査読有り]

     概要を見る

    The out-of-plane displacement of a cantilever is measured by phase-shifting digital holography. From four phase-shifted holograms of a cantilever recorded by a CCD image sensor, a complex amplitude at each pixel of the CCD plane is obtained using the conventional phase-shifting method. The complex amplitude of a cantilever is reconstructed from the complex amplitude of the CCD plane using the Fresnel diffraction integral. The phase difference distribution on the cantilever before and after deformation, i.e., the out-of-plane displacement distribution, is calculated. In order to decrease the effect of speckle noise, a new method using divided holograms is proposed. The theory and experimental results are shown.

  • 位相シフトディジタルホログラフィ干渉法による変形計測(OS8-2 光学的手法,OS8 実験力学の新たな発展)

    森本 吉春, 野村 孝徳, 藤垣 元治, 米山 聡, 高橋 功

    材料力学部門講演会講演論文集 ( 一般社団法人日本機械学会 )  2004   571 - 572   2004年

     概要を見る

    Measurement of the out-of-plane displacement of a cantilever is performed by phase-shifting digital holographic interferomety. Phase-shifting method is used for the phase analysis of the hologram recorded on a CCD sensor. The complex amplitude of the reconstructed object is obtained from the complex amplitude of the CCD plane using the Fresnel diffraction algorithm. The difference of the phase distributions before and after deformation, i.e. out-of-plane displacement is calculated. In order to decrease the effect of speckle pattern, the hologram is divided into 16 parts. The phase is obtained from the phase with the maximum amplitude among the complex amplitudes obtained from all the separated holograms. As the result, by eliminating the effect of speckle, a smooth phase difference distribution is obtained.

    DOI

  • Optical encryption using an input phase mask designed for the space bandwidth of the optical system

    T Nomura, T Fujita, E Nitanai, T Numata, B Javidi

    2004 IEEE LEOS ANNUAL MEETING CONFERENCE PROCEEDINGS, VOLS 1 AND 2 ( IEEE )    344 - 345   2004年  [査読有り]

     概要を見る

    The method to design an input phase mask for the double-random phase-encoding optical encryption is proposed. The input phase;mask is designed so that the extend of the Fourier spectrum of the product of an input image and the input phase mask corresponds to the space bandwidth of the optical system. By using the designed input phase mask, we show that the bit-error rate is improved.

  • Real-time analysis of isochromatics and isoclinics using the phase-shifting method

    S Yoneyama, Y Morimoto, T Nomura, M Fujigaki, R Matsui

    EXPERIMENTAL MECHANICS ( SPRINGER )  43 ( 1 ) 83 - 89   2003年03月  [査読有り]

     概要を見る

    This paper studies a new real-time phase-shifting method for the analysis of isochromatic and isoclinic parameters in photoelasticity. By rotating an analyzer at a constant rate and an output quarter-wave plate at a double rate of the analyzer and recording images by a CCD camera continuously, sequential images which brightness is integrated by sensors in a CCD camera during phase-shifting are obtained. Then, the distributions of the isochromatic and isoclinic parameters are obtained immediately and quantitatively using the proposed phase-shifting algorithm. The proposed method can be applied to high-speed inspection of optical elements or glass products. Also, it is expected that slowly varying time-dependent problems can be analyzed by the proposed method.

  • Secure optical data storage with random phase key codes by use of a configuration of a joint transform correlator

    T Nomura, S Mikan, Y Morimoto, B Javidi

    APPLIED OPTICS ( OPTICAL SOC AMER )  42 ( 8 ) 1508 - 1514   2003年03月  [査読有り]

     概要を見る

    A secure optical storage based on a configuration of a joint transform correlator by use of a photorefractive material is presented. A key code designed through the use of an optimized algorithm so that its Fourier transform has a uniform amplitude distribution and a uniformly random phase distribution is introduced. Original two-dimensional data and the key code are placed side-by-side at the input plane. Both of them are stored in a photorefractive material as a joint power spectrum. The retrieval of the original data can be achieved with the same key code. We can record multiple two-dimensional data in the same crystal by angular multiplexing and/or key code multiplexing. (C) 2003 Optical Society of America.

  • 535 位相シフトデジタルホログラフィによるたわみ分布計測

    高橋 功, 森本 吉春, 野村 孝徳, 米山 聡, 藤垣 元治

    年次大会講演論文集 ( 一般社団法人日本機械学会 )  2002   175 - 176   2002年

     概要を見る

    In this study, the deflection distribution of a cantilever is measured combining the holographic interferometry and phase-shifting digital holography. Holographic interferometry can measure with high accuracy, high sensitivity, and full-field by noncontacting. But the development processing of a film is troublesome by holographic interferometry. Digital holography record on CCD and it reconstructs it with a computer. Therefore, development processing is not needed and it is early reproducible by digital holography. Digital holography has the amplitudes information and phase information in digital information. By the holographic interferometer, the sum of complex amplitude before and after deformation is reconstructed. In this study, the sum of complex amplitude before and after deformation is calculated and reconstructed. Therefore, phase difference computed for digital information and the displacement of a nano-meter order will be able to measure with this method.

    DOI

  • 219 位相シフト法を用いた光弾性皮膜法による実時間応力・ひずみ解析(OS6-5 光弾性法II)(OS6 実験力学の新展開)

    加藤 良二, 松井 亮, 森本 吉春, 野村 孝徳, 藤垣 元治, 米山 聡

    材料力学部門講演会講演論文集 ( 一般社団法人日本機械学会 )  2001   153 - 154   2001年

    DOI

  • Frequency domain methods in digital photoelasticity

    Y Morimoto, T Nomura, M Fujigaki, R Matsui

    SECOND INTERNATIONAL CONFERENCE ON EXPERIMENTAL MECHANICS ( SPIE-INT SOC OPTICAL ENGINEERING )  4317   117 - 122   2001年  [査読有り]

     概要を見る

    To analyze fringe patterns, frequency and phase analysis of fringes becomes popular. It provides accurate results and automated processing. In this paper, the theories of the frequency and phase domain methods such as the Fourier transform method, the wavelet transform method and the phase-shifting method are proposed for photoelastic fringe pattern analysis. The applications of these methods are described.

  • Digital holographic data reconstruction with data compression

    T Nomura, A Okazaki, M Kameda, Y Morimoto, B Javidi

    ALGORITHMS AND SYSTEMS FOR OPTICAL INFORMATION PROCESSING V ( SPIE-INT SOC OPTICAL ENGINEERING )    235 - 242   2001年  [査読有り]

     概要を見る

    A digital holographic data reconstruction method with data compression is proposed. We show the number of quantization level of a digital hologram can be reduced. By computer simulations it is confirmed that the method is especially useful for binary images. For gray scale images, we propose a bit plane decomposition method. By this method, we show both high reconstructed image quality and a high compression ratio can be achieved. This method is applicable to both a normal digital hologram and an encrypted digital hologram.

  • Hartley transformation for hybrid pattern matching

    Takanori Nomura, Kazuyoshi Itoh, Yoshiki Ichioka

    Applied Optics   29 ( 29 ) 4345 - 4350   1990年10月  [査読有り]

     概要を見る

    A hybrid pattern matching system using the binary versions of the Hartley and related transformations is presented. These transformations can be obtained by an incoherent optical system described in this paper. *Using them, the spurious correlation signals inherent in an incoherent pattern matching system based on the optical cosine transformation are removed. Experimental demonstrations in an incoherent-optical/digital- electronic hybrid system are also presented. © 1990 Optical Society of America.

    DOI

  • Hybrid high speed pattern matching using a binary incoherent hologram generated by a rotational shearing interferometer

    T. Nomura, K. Itoh, Y. Ichioka

    Applied Optics   28 ( 23 ) 4987 - 4991   1989年  [査読有り]

     概要を見る

    A hybrid image processing system for high speed pattern matching is presented. The system consists of an incoherent optical system and an electronic digital image processor. The optical system makes use of the matched filtering technique based on incoherent holography. The incoherent holograms of an input object and a reference object are binarized. This binarization of holograms has two major advantages: (1) it sharpens the autocorrelation peak, and (2) it makes real time processing possible. We demonstrate the high potential of this method by presenting computer simulations and experiments. © 1989, Optical Society of America.

    DOI

▼全件表示

書籍等出版物

  • Polarization Encoding for Optical Security Systems

    Optical and Digital Techniques for Information Security (Springer)  2005年 

  • Applications of Digital Holography for Information Security (Springer)

    Optical and Digital Techniques for Information Security (Springer)  2005年 

  • Applications of Digital Holography for Information Security (Springer)

    Optical and Digital Techniques for Information Security (Springer)  2005年 

  • Polarization Encoding for Optical Security Systems

    Optical and Digital Techniques for Information Security (Springer)  2005年 

  • Optical Image Encryption Using Optimized Keys

    Optical and Digital Techniques for Information Security (Springer)  2005年 

  • Optical Image Encryption Using Optimized Keys

    Optical and Digital Techniques for Information Security (Springer)  2005年 

  • インコヒーレント光・電子複合型相関器

      1997年 

  • Incoherent Optical and Electronic Hybrid Correlator

    Advanced Optical Correlators for Pattern Recognition and Association, (Research Signpost)  1997年 

  • Incoherent Optical and Electronic Hybrid Correlator

    Advanced Optical Correlators for Pattern Recognition and Association, (Research Signpost)  1997年 

  • Incoherent-Optical Electronic Hybrid Pattern Recognition, in Recent Research Developments in Applied Optics (jointly worked)

    Research Signpost  1996年 

  • 光メカトロニクス入門(共著)

    共立出版  1996年 

  • Incoherent-Optical Electronic Hybrid Pattern Recognition, in Recent Research Developments in Applied Optics (jointly worked)

    Research Signpost  1996年 

  • Introduction to Opto-Mechatronics

    Kyoritsu Shuppan  1996年 

  • Introduction to Opto-Mechatronics

    Kyoritsu Shuppan  1996年 

  • 数論(上)(翻訳書)(共著)

    コロナ社  1995年 

  • Number Theory in Science and Communication, the second volume, Translation into Japanese

      1995年 

  • Number Theory in Science and Communication, the second volume, Translation into Japanese

      1995年 

  • Number Theory in Science and Communication, the first volume, Translation into Japanese

      1995年 

  • 数論(下)(翻訳書)(共著)

    コロナ社  1995年 

  • Number Theory in Science and Communication, the first volume, Translation into Japanese

      1995年 

  • Multi-Dimensional Signal Processing, in Handbook of Statistics vol. 10(jointly worked)

    Elsevier Science Publishers  1993年 

  • Multi-Dimensional Signal Processing, in Handbook of Statistics vol. 10(jointly worked)

    Elsevier Science Publishers  1993年 

▼全件表示

Misc

  • Compressive spectral imaging with a blazed grating to improve the signal-to-noise ratio

    Daiki Shimoyama, Yusuke Saita, and Takanori Nomura,

    OSJ-OSA-OSK Joint Symposia on Optics Program     2020年11月

  • Coaxial holographic memory to increase recording capacity using computer-generated hologram

    Takanori Nomura, Naru Yoneda, and Yusuke Saita, (担当区分: 筆頭著者, 責任著者 )

    International Conference on Optoelectronic and Microelectronic Technology and Application 2020     2020年10月  [招待有り]

  • Simultaneous measurement of two parameters of the spherical lens by low-coherence interferometry

    Ying Sun, Takanori Nomura

    Proceedings of SPIE - The International Society for Optical Engineering ( SPIE-INT SOC OPTICAL ENGINEERING )  11548   2020年  [査読有り]

     概要を見る

    To measure different parameters of a spherical lens simultaneously, a method by low-coherence interferometry with a low temporal coherent light source is proposed. This proposed method can obtain both the radius of curvature and the central thickness of a spherical lens in a single optical system. Owing to the property of low temporal coherence, the contrast of interference fringe pattern, hologram, varies with the optical path difference of an object beam and a reference beam. This enables the central thickness of the test lens to acquire with a Michelson interferometer. Simultaneously, the spherical shape of the test lens, namely the radius of curvature, can be obtained from a hologram which contains information of the wavefront curvature from the reected beam of the spherical surface of the test lens.

    DOI

  • Numerical evaluation of transport-of-intensity phase imaging with oblique illumination for refractive index tomography

    Koshi Komuro, Yusuke Saita, Yosuke Tamada, Takanori Nomura

    Proceedings Digital Holography and Three-Dimensional Imaging 2019     2019年05月  [査読有り]

     概要を見る

    A scanless phase retrieval method based on the transport of intensity equation is proposed for refractive index tomography. A phase distribution is measured from defocused intensity distributions obtained with oblique illumination of different tilt angles.

    DOI

  • Computer-generated-hologram-based holographic data storage using a transport of intensity equation

    Naru Yoneda, Yusuke Saita, Koshi Komuro, Teruyoshi Nobukawa, Takanori Nomura

    Optics InfoBase Conference Papers   Part F125-OPJ 2018   2018年  [査読有り]

     概要を見る

    Utilization of phase information can increase the recording density of holographic data storage. In this paper, a transport of intensity equation is introduced to computer-generated-hologram-based holographic data storage, which can obtain the phase datapage while keeping an optical setup simple and compact. Moreover, two defocused intensity distributions for the transport of intensity equation can be simultaneously obtained by using a conjugate beam from the computer-generated hologram.

    DOI

  • Deep-learning-based phase retrieval for pure phase objects in computational ghost imaging

    Koshi Komuro, Alexandre Goy, Takanori Nomura, George Barbastathis

    Optics InfoBase Conference Papers   Part F125-OPJ 2018   2018年  [査読有り]

     概要を見る

    A deep-learning-based phase retrieval method is proposed for computational ghost imaging (CGI). In the method, a defocused intensity distribution of an object is obtained by the CGI. An object's phase distribution is retrieved from the intensity distribution by a trained deep neural network. The advantage of the method is that the phase retrieval can be achieved with a low signal to noise ratio. The effects of noise level and defocus distance are investigated.

    DOI

  • ホログラフィックディスプレイにおけるスペックル低減法 (「ホログラフィによる立体テレビ技術の現状と展望」特集号)

    森 裕, 野村 孝徳

    レーザー研究 = The review of laser engineering : レーザー学会誌 ( レーザー学会 )  44 ( 7 ) 429 - 433   2016年07月

  • ディジタルホログラフィーの高画質化を目指したホログラム合成技術

    野村 孝徳

    光学 ( 応用物理学会分科会日本光学会 )  40 ( 10 ) 539 - 543   2011年10月

  • Optical reconstruction of digital hologram using spatial light modulator for binocular stereopsis

    MORI Yutaka, NOMURA Takanori

    Digital Holography and Three-Dimensional Imaging 2011     paper DTuC7   2011年05月  [査読有り]

    DOI

  • Digital holographic binocular stereopsis

    NOMURA Takanori, MORI Yutaka

    Digital Holography and Three-Dimensional Imaging 2010     DWB5   2010年04月  [査読有り]

    DOI

  • Object recognition by use of polarimetric phase-shifting digital holography

    Takanori Nomura, Bahram Javidi

    OPTICS LETTERS ( OPTICAL SOC AMER )  32 ( 15 ) 2146 - 2148   2007年08月  [査読有り]

     概要を見る

    Pattern recognition by use of polarimetric phase-shifting digital holography is presented. Using holography, the amplitude distribution and phase difference distribution between two orthogonal polarizations of three-dimensional (3D) or two-dimensional phase objects are obtained. This information contains both complex amplitude and polarimetric characteristics of the object, and it can be used for improving the discrimination capability of object recognition. Experimental results are presented to demonstrate the idea. To the best of our knowledge, this is the first report on 3D polarimetric recognition of objects using digital holography. (C) 2007 Optical Society of America.

    DOI

  • 「3次元情報のディジタル記録・再生-ディジタルホログラフィの最前線-」解説小特集号によせて

    野村 孝徳

    レーザー研究   35 ( 6 ) 357 - 357   2007年06月

  • 波面分割位相シフトディジタルホログラフィ

    野村 孝徳, 村田 新治, 米山 聡, 似内 映之, 沼田 卓久

    レーザー研究 ( レ-ザ-学会 )  35 ( 6 ) 363 - 367   2007年06月

  • Polarization imaging of a 3D object by use of on-axis phase-shifting digital holography

    Takanori Nomura, Bahram Javidi, Shinji Murata, Eiji Nitanai, Takuhisa Numata

    OPTICS LETTERS ( OPTICAL SOC AMER )  32 ( 5 ) 481 - 483   2007年03月  [査読有り]

     概要を見る

    A polarimetric imaging method of a 3D object by use of on-axis phase-shifting digital holography is presented. The polarimetric image results from a combination of two kinds of holographic imaging using orthogonal polarized reference waves. Experimental demonstration of a 3D polarimetric imaging is presented. (c) 2007 Optical Society of America.

    DOI

  • Multi-Spectral Holographic Three-Dimensional Image Fusion Using Discrete Wavelet Transform

    Bahram Javidi, Cuong Manh Do, Seung-Hyun Hong, Takanori Nomura

    JOURNAL OF DISPLAY TECHNOLOGY ( IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC )  2 ( 4 ) 411 - 417   2006年12月  [査読有り]

     概要を見る

    We present multi-spectral holographic three-dimensional image fusion using the discrete wavelet transform (DWT). The fusion results are compared with those of the Gaussian and Laplacian pyramid fusion methods. The advantage of the DWT over other methods is that it has more flexibility in controlling high frequency components as well as low frequency components, which improves the fused image quality. A wavelength tunable solid-state pumped laser is used to record up to 11 holograms with wavelengths from 567 to 613 nm. We present the fused reconstructed holographic images including multi-spectral fused images from the recorded multiple holograms. Fused multi-wavelength reconstructed holographic images provide multi-spectral information about the objects.

    DOI

  • Design of input phase mask for the space bandwidth of the optical encryption system

    T Nomura, E Nitanai, T Numata, B Javidi

    OPTICAL ENGINEERING ( SPIE-INT SOCIETY OPTICAL ENGINEERING )  45 ( 1 )   2006年01月

     概要を見る

    A method to design an input phase mask for double-random phase-encoding optical encryption is proposed. The input phase mask is iteratively designed so that the extent of the Fourier spectrum of the product of an input image and the input phase mask correspond to the space bandwidth of the optical system. By using the designed input phase mask, we show that the bit-error rate is improved. We also discuss the number of phase levels of the designed input phase mask. (c) 2006 Society of Photo-Optical Instrumentation Engineers.

    DOI

  • Design of input phase mask for the space bandwidth of the optical encryption system

    T Nomura, E Nitanai, T Numata, B Javidi

    OPTICAL ENGINEERING ( SPIE-INT SOCIETY OPTICAL ENGINEERING )  45 ( 1 )   2006年01月

     概要を見る

    A method to design an input phase mask for double-random phase-encoding optical encryption is proposed. The input phase mask is iteratively designed so that the extent of the Fourier spectrum of the product of an input image and the input phase mask correspond to the space bandwidth of the optical system. By using the designed input phase mask, we show that the bit-error rate is improved. We also discuss the number of phase levels of the designed input phase mask. (c) 2006 Society of Photo-Optical Instrumentation Engineers.

    DOI

  • Phase-shifting digital holography with a phase difference between orthogonal polarizations

    Appl. Opt

    Takanori Nomura, Shinji Murata, Eiji Nitanai, and Takuhisa Numata   45 ( 20 ) 4873 - 4877   2006年

    DOI

  • Image reconstruction from compressed encrypted digital hologram

    T Nomura, A Okazaki, M Kameda, Y Morimoto, B Javidi

    OPTICAL ENGINEERING ( SPIE-INT SOCIETY OPTICAL ENGINEERING )  44 ( 7 )   2005年07月

     概要を見る

    An encrypted digital holographic data reconstruction method with data compression is proposed. We show that the number of quantization levels of the digital hologram can be reduced. By computer simulations, we confirm that the method is especially useful for binary images. For gray-scale images, we propose a bit plane decomposition method. By this method, we show that both high reconstructed image quality and a high compression ratio can be achieved. (c) 2005 Society of Photo-Optical Instrumentation Engineers.

    DOI

  • Image reconstruction from compressed encrypted digital hologram

    T Nomura, A Okazaki, M Kameda, Y Morimoto, B Javidi

    OPTICAL ENGINEERING ( SPIE-INT SOCIETY OPTICAL ENGINEERING )  44 ( 7 )   2005年07月

     概要を見る

    An encrypted digital holographic data reconstruction method with data compression is proposed. We show that the number of quantization levels of the digital hologram can be reduced. By computer simulations, we confirm that the method is especially useful for binary images. For gray-scale images, we propose a bit plane decomposition method. By this method, we show that both high reconstructed image quality and a high compression ratio can be achieved. (c) 2005 Society of Photo-Optical Instrumentation Engineers.

    DOI

  • Multiwavelengths holgoraphic image fusion using 2D discrete wavelet transform

    Proc. Soc. Photo-Opt. Instrum. Eng.   6016   2005年

  • An input phase mask desinged for optical space bandwidth

    Optics in Information Systems (SPIE Int. Technical Group Newsletter)   16, 2, 5   2005年

  • Quasi one-shot phase-shifting digital holography

    Takanori Nomura, Shinji Murata, Eiji Nitanai, Takuhisa Numata

    Proceedings of SPIE - The International Society for Optical Engineering   6016   2005年

     概要を見る

    The quasi one-shot phase-shifting digital holography using phase difference of orthogonal polarizations is proposed. The use of orthogonal polarizations can make it possible to record two phase-shifted holograms simultaneously. By combining the holograms with distributions of a reference wave and an object wave, the complex field of the wavefront of a 3D object can be obtained. As two phase-shifted holograms can be obtained simultaneously in the proposed method, even a moving object can be recorded.

    DOI

  • Quasi one-shot phase-shifting digital holography

    Takanori Nomura, Shinji Murata, Eiji Nitanai, Takuhisa Numata

    Proceedings of SPIE - The International Society for Optical Engineering   6016   2005年

     概要を見る

    The quasi one-shot phase-shifting digital holography using phase difference of orthogonal polarizations is proposed. The use of orthogonal polarizations can make it possible to record two phase-shifted holograms simultaneously. By combining the holograms with distributions of a reference wave and an object wave, the complex field of the wavefront of a 3D object can be obtained. As two phase-shifted holograms can be obtained simultaneously in the proposed method, even a moving object can be recorded.

    DOI

  • Optical encryption based on the input phase mask designed for the space bandwidth of the optical system

    Takanori Nomura, Bahram Javidi

    Proceedings of SPIE - The International Society for Optical Engineering   5908   1 - 8   2005年

     概要を見る

    To improve the image quality of the decrypted image through the double-random phase-encoding optical encryption, the design method of the input phase mask is proposed. The input phase mask is iteratively designed so that the extent of the Fourier spectrum of the product of an input image and the input phase mask matches to the space bandwidth of the optical system. By using the designed input phase mask, we show that the bit-error rate is improved. We also discuss the number of the phase levels of the designed input phase mask.

    DOI

  • Optical encryption based on the input phase mask designed for the space bandwidth of the optical system

    Takanori Nomura, Bahram Javidi

    Proceedings of SPIE - The International Society for Optical Engineering   5908   1 - 8   2005年

     概要を見る

    To improve the image quality of the decrypted image through the double-random phase-encoding optical encryption, the design method of the input phase mask is proposed. The input phase mask is iteratively designed so that the extent of the Fourier spectrum of the product of an input image and the input phase mask matches to the space bandwidth of the optical system. By using the designed input phase mask, we show that the bit-error rate is improved. We also discuss the number of the phase levels of the designed input phase mask.

    DOI

  • Hybrid optical encryption of a three-dimensional object

    Optics in Information Systems (SPIE Int. Technical Group Newsletter)   16, 1, 5   2005年

  • Multiwavelengths holgoraphic image fusion using 2D discrete wavelet transform

    Proc. Soc. Photo-Opt. Instrum. Eng.   6016   2005年

  • Hybrid optical encryption of a three-dimensional object

    Optics in Information Systems (SPIE Int. Technical Group Newsletter)   16, 1, 5   2005年

  • An input phase mask desinged for optical space bandwidth

    Optics in Information Systems (SPIE Int. Technical Group Newsletter)   16, 2, 5   2005年

  • Hybrid optical encryption of a 3-D object using a digital holographic technique

    T Nomura, K Uota, Y Morimoto

    OPTICAL ENGINEERING ( SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS )  43 ( 10 ) 2228 - 2232   2004年10月

     概要を見る

    An encryption method of a 3-D object based on the phase modulation of an object wave is proposed. The phase of the object wave is modulated by a virtual optical random phase mask using a digital holographic technique. The keys of an encryption step are both a phase distribution and a position of the virtual optical phase mask. If either of them is not correct, we cannot decrypt the 3-D object. Owing to a characteristic of a hologram, we can see some parallax of a reconstructed 3-D object. Experimental results are presented to confirm the proposed method. (C) 2004 Society of Photo-Optical Instrumentation Engineers.

    DOI

  • Hybrid optical encryption of a 3-D object using a digital holographic technique

    T Nomura, K Uota, Y Morimoto

    OPTICAL ENGINEERING ( SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS )  43 ( 10 ) 2228 - 2232   2004年10月

     概要を見る

    An encryption method of a 3-D object based on the phase modulation of an object wave is proposed. The phase of the object wave is modulated by a virtual optical random phase mask using a digital holographic technique. The keys of an encryption step are both a phase distribution and a position of the virtual optical phase mask. If either of them is not correct, we cannot decrypt the 3-D object. Owing to a characteristic of a hologram, we can see some parallax of a reconstructed 3-D object. Experimental results are presented to confirm the proposed method. (C) 2004 Society of Photo-Optical Instrumentation Engineers.

    DOI

  • ディジタルホログラフィー技術を用いた3次元物体の光暗号化記録

    野村 孝徳

    光技術コンタクト ( 日本オプトメカトロニクス協会 )  42, No. 6 pp. 292-298 ( 6 ) 292 - 298   2004年

  • 423 位相シフトデジタルホログラフィによる面外変位計測

    高橋 功, 森本 吉春, 野村 孝徳, 米山 聡, 藤垣 元治

    日本機械学会関東支部総会講演会講演論文集 ( 一般社団法人日本機械学会 )  2003 ( 9 ) 175 - 176   2003年03月

     概要を見る

    The out-of-plane displacement of a cantilever is measured by phase-shifting digital holography. Fourier transform phase-shifting method is used for phase analysis. The 36 holograms with phase-shift are recorded by a CCD. The complex amplitude of the CCD plane is obtained using the Fourier transform phase-shifting method. The complex amplitude of reconstructed plane is obtained from the complex amplitude of the CCD plane using Fresnel diffraction algorithm. A difference of the phase distribution of before and after deformation, i.e. out-of-plane displacement is calculated. The smooth phase difference is obtained by the Fourier transform phase-shifting method.

  • 位相シフトデジタルホログラフィを用いた段差のある物体の変位計測

    高橋 功, 森本 吉春, 野村 孝徳

    日本実験力学会講演論文集 ( 日本実験力学会 )  ( 3 ) 89 - 91   2003年

  • レーザ干渉法を用いた計測におけるノウハウ (合同ワークショップ2003「実験力学における計測・データ処理の問題点・ノウハウ・工夫」)

    森本 吉春, 野村 孝徳, 藤垣 元治

    日本実験力学会講演論文集 ( 日本実験力学会 )  ( 3 ) 1 - 7   2003年

  • フーリエ変換位相シフト法とエイリアシングを用いた同時4ビームモアレ干渉縞解析

    山本 裕子, 森本 吉春, 野村 孝徳

    日本実験力学会講演論文集 ( 日本実験力学会 )  ( 3 ) 79 - 84   2003年

  • Deformation measurement by digital holographic, interferometry

    Takahashi, I, T Nomura, Y Morimoto, S Yoneyama, M Fujigaki

    OPTOMECHATRONIC SYSTEMS IV ( SPIE-INT SOC OPTICAL ENGINEERING )  5264   206 - 213   2003年

     概要を見る

    Deformation measurement of a cantilever based on digital holographic interferometry is presented. The digital holo,,, rams of the cantilever before and after deformation are obtained by use of phase-shifting technique. By using the phase-shifting digital holography. the object wave information without zeroth order diffraction wave can be extracted. The phase difference of the reconstructed cantilever before and after deformation is obtained numerically using discrete Fresnel diffraction integral. Owing to the numerical analysis, the deformation of the cantilever can be obtained with high resolution of nanometer dimensions. The optical experimental results are shown to confirm our proposed method. Furthermore, we propose a mechanical movement free double-exposure method in phase-shifting digital holography using a laser diode.

    DOI

  • Deformation measurement by digital holographic, interferometry

    Takahashi, I, T Nomura, Y Morimoto, S Yoneyama, M Fujigaki

    OPTOMECHATRONIC SYSTEMS IV ( SPIE-INT SOC OPTICAL ENGINEERING )  5264   206 - 213   2003年

     概要を見る

    Deformation measurement of a cantilever based on digital holographic interferometry is presented. The digital holo,,, rams of the cantilever before and after deformation are obtained by use of phase-shifting technique. By using the phase-shifting digital holography. the object wave information without zeroth order diffraction wave can be extracted. The phase difference of the reconstructed cantilever before and after deformation is obtained numerically using discrete Fresnel diffraction integral. Owing to the numerical analysis, the deformation of the cantilever can be obtained with high resolution of nanometer dimensions. The optical experimental results are shown to confirm our proposed method. Furthermore, we propose a mechanical movement free double-exposure method in phase-shifting digital holography using a laser diode.

    DOI

  • Secure optical data storage with random phase key codes by use of a configuration of a joint transform correlator

    NOMURA T, MIKAN S, MORIMOTO Y, JAVIDI B

    Applied Optics   42 ( 8 ) 1508 - 1514   2003年

    DOI

  • Secure optical data storage with random phase key codes by use of a configuration of a joint transform correlator

    Applied Optics   42 ( 8 ) 1508 - 1514   2003年

    DOI

  • 位相シフトデジタルホログラフィを用いた面外変位計測(共著)

    高橋功, 森本吉春, 野村孝徳, 米山聡, 藤垣元治

    実験力学 ( 日本実験力学会 )  3 ( 2 ) 98 - 102   2003年

    DOI

  • 2成分同時積分型位相シフト法を用いたモアレ干渉法による熱変形計測

    山本 裕子, 森本 吉春, 野村 孝徳, 藤垣 元治, 米山 聡

    日本実験力学会研究発表講演会講演論文集 ( 日本実験力学会 )  2   27 - 31   2002年08月

  • 光情報処理

    野村 孝徳

    光学   31 ( 5 ) 399 - 399   2002年05月

  • Secure optical storage with a random phase key code based on a joint transform correlator architecture

    T Nomura, S Mikan, Y Morimoto, B Javidi

    ALGORITHMS AND SYSTEMS FOR OPTICAL INFORMATION PROCESSING VI ( SPIE-INT SOC OPTICAL ENGINEERING )  4789   275 - 282   2002年

     概要を見る

    An encrypted optical storage based on a joint transform correlator architecture by using a photorefractive material is presented. A key code designed by optimized algorithm so that its Fourier transform has a uniform amplitude distribution and a random phase distribution is introduced. Original two-dimensional data and the key code are placed side by side at the input plane. Both of them are stored in a photorefractive material as a joint power spectrum. The retrieval of the original data can be achieved with the same key code. We can record multiple two-dimensional data in a same crystal by angular multiplexing. Furthermore we can record by key code multiplexing because another designed key code can produce another independent phase distribution. We demonstrate the concept of the optical data storage system by computer simulations.

  • Secure optical storage with a random phase key code based on a joint transform correlator architecture

    T Nomura, S Mikan, Y Morimoto, B Javidi

    ALGORITHMS AND SYSTEMS FOR OPTICAL INFORMATION PROCESSING VI ( SPIE-INT SOC OPTICAL ENGINEERING )  4789   275 - 282   2002年

     概要を見る

    An encrypted optical storage based on a joint transform correlator architecture by using a photorefractive material is presented. A key code designed by optimized algorithm so that its Fourier transform has a uniform amplitude distribution and a random phase distribution is introduced. Original two-dimensional data and the key code are placed side by side at the input plane. Both of them are stored in a photorefractive material as a joint power spectrum. The retrieval of the original data can be achieved with the same key code. We can record multiple two-dimensional data in a same crystal by angular multiplexing. Furthermore we can record by key code multiplexing because another designed key code can produce another independent phase distribution. We demonstrate the concept of the optical data storage system by computer simulations.

  • 積分型位相シフト法を用いた等色線・等傾線の高速解析

    松井 亮, 森本 吉春, 野村 孝徳, 藤垣 元治, 米山 聡

    日本実験力学会研究発表講演会講演論文集 ( 日本実験力学会 )  1   167 - 170   2001年06月

  • 2次元位相シフト法を用いたモアレ干渉法における方向別位相分離手法の開発

    山本 裕子, 森本 吉春, 野村 孝徳, 藤垣 元治, 米山 聡

    日本実験力学会研究発表講演会講演論文集 ( 日本実験力学会 )  1   159 - 162   2001年06月

  • 和歌山大学システム工学部光メカトロニクス学科 光波・画像計測研究グループ

    森本 吉春, 野村 孝徳, 藤垣 元治, 米山 聡

    非破壊検査   50 ( 2 ) 119 - 119   2001年02月

  • Optical image encryption using an optimally designed encryption key

    T Nomura, B Javidi, S Mikan, Y Morimoto

    CLEO(R)/PACIFIC RIM 2001, VOL II, TECHNICAL DIGEST ( IEEE )  2   492 - 493   2001年

     概要を見る

    A double-random-phase optical encryption system that uses an optimally designed binary key is proposed. Computer simulation results are presented to demonstrate the effectiveness of the proposed system.

  • Digital holographic data reconstruction with data compression

    Takanori Nomura, Atsushi Okazaki, Masashi Kameda, Yoshiharu Morimoto, Bahram Javidi

    Proceedings of SPIE - The International Society for Optical Engineering   4471   235 - 242   2001年

     概要を見る

    A digital holographic data reconstruction method with data compression is proposed. We show the number of quantization level of a digital hologram can be reduced. By computer simulations it is confirmed that the method is especially useful for binary images. For gray scale images, we propose a bit plane decomposition method. By this method, we show both high reconstructed image quality and a high compression ratio can be achieved. This method is applicable to both a normal digital hologram and an encrypted digital hologram.

    DOI

  • Digital holographic data reconstruction with data compression

    Takanori Nomura, Atsushi Okazaki, Masashi Kameda, Yoshiharu Morimoto, Bahram Javidi

    Proceedings of SPIE - The International Society for Optical Engineering   4471   235 - 242   2001年

     概要を見る

    A digital holographic data reconstruction method with data compression is proposed. We show the number of quantization level of a digital hologram can be reduced. By computer simulations it is confirmed that the method is especially useful for binary images. For gray scale images, we propose a bit plane decomposition method. By this method, we show both high reconstructed image quality and a high compression ratio can be achieved. This method is applicable to both a normal digital hologram and an encrypted digital hologram.

    DOI

  • Optical image encryption using an optimally designed encryption key

    T Nomura, B Javidi, S Mikan, Y Morimoto

    CLEO(R)/PACIFIC RIM 2001, VOL II, TECHNICAL DIGEST ( IEEE )  2   492 - 493   2001年

     概要を見る

    A double-random-phase optical encryption system that uses an optimally designed binary key is proposed. Computer simulation results are presented to demonstrate the effectiveness of the proposed system.

  • Polarization encoding for optical security systems

    Bahrain Javidi, Takanori Nomura

    Optical Engineering ( Society of Photo-Optical Instrumentation Engineers )  39 ( 9 ) 2439 - 2443   2000年09月

     概要を見る

    A polarization-encoding system for optical security verification is proposed. The polarization-encoded information can be used for secure verification. The polarization state of the input image can provide an additional degree of freedom in using optics to secure information. The expressions for polarization-encoded input images are developed using Jones polarization calculus. A nonlinear joint transform correlator is used to provide optical validation. Computer simulations and optical experimental results are shown in support of the proposed method.

    DOI

  • Optical encryption system with a binary key code

    T Nomura, B Javidi

    APPLIED OPTICS ( OPTICAL SOC AMER )  39 ( 26 ) 4783 - 4787   2000年09月

     概要を見る

    A double-random-phase optical encryption system that uses a binary key code is proposed. The key code is generated as a binary computer-generated hologram. The binary key code can be displayed on a binary spatial light modulator (SLM) such as a ferroelectric liquid-crystal display. The use of a binary SLM enables us to renew the key at high speed. A joint transform correlator based on a photorefractive crystal in the Fourier domain is used to perform shift-invariant encryption and decryption. Computer simulations of the effects of using a binary encoded key code instead of a complex amplitude key code are shown. Preliminary optical experimental results are presented to demonstrate the effectiveness of the proposed system. (C) 2000 Optical Society of America OCIS codes: 070.2580, 070.4550, 070.4560, 090.1760, 200.3050, 200.4740.

  • Optical encryption system with a binary key code

    T Nomura, B Javidi

    APPLIED OPTICS ( OPTICAL SOC AMER )  39 ( 26 ) 4783 - 4787   2000年09月

     概要を見る

    A double-random-phase optical encryption system that uses a binary key code is proposed. The key code is generated as a binary computer-generated hologram. The binary key code can be displayed on a binary spatial light modulator (SLM) such as a ferroelectric liquid-crystal display. The use of a binary SLM enables us to renew the key at high speed. A joint transform correlator based on a photorefractive crystal in the Fourier domain is used to perform shift-invariant encryption and decryption. Computer simulations of the effects of using a binary encoded key code instead of a complex amplitude key code are shown. Preliminary optical experimental results are presented to demonstrate the effectiveness of the proposed system. (C) 2000 Optical Society of America OCIS codes: 070.2580, 070.4550, 070.4560, 090.1760, 200.3050, 200.4740.

  • Polarization encoding for optical security systems

    B Javidi, T Nomura

    OPTICAL ENGINEERING ( SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS )  39 ( 9 ) 2439 - 2443   2000年09月

     概要を見る

    A polarization-encoding system for optical security verification is proposed. The polarization-encoded information can be used for secure verification. The polarization state of the input image can provide an additional degree of freedom in using optics to secure information. The expressions for polarization-encoded input images are developed using Jones polarization calculus. A nonlinear joint transform correlator is used to provide optical validation. Computer simulations and optical experimental results are shown in support of the proposed method. (C) 2000 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(00)02209-1].

    DOI

  • Optical encryption using a joint transform correlator architecture

    T Nomura, B Javidi

    OPTICAL ENGINEERING ( SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS )  39 ( 8 ) 2031 - 2035   2000年08月

     概要を見る

    An optical double random-phase encryption method using a joint transform correlator architecture is proposed. In this method, the joint power spectrum of the image to be encrypted and the key codes is recorded as the encrypted data. Unlike the case with classical double random-phase encryption, the same key code is used to both encrypt and decrypt the data, and the conjugate key is not required. Computer simulations and optical experimental results using a photorefractive-crystal-based processor are presented. (C) 2000 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(00)03508-X].

    DOI

  • Optical encryption using a joint transform correlator architecture

    T Nomura, B Javidi

    OPTICAL ENGINEERING ( SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS )  39 ( 8 ) 2031 - 2035   2000年08月

     概要を見る

    An optical double random-phase encryption method using a joint transform correlator architecture is proposed. In this method, the joint power spectrum of the image to be encrypted and the key codes is recorded as the encrypted data. Unlike the case with classical double random-phase encryption, the same key code is used to both encrypt and decrypt the data, and the conjugate key is not required. Computer simulations and optical experimental results using a photorefractive-crystal-based processor are presented. (C) 2000 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(00)03508-X].

    DOI

  • Securing information by use of digital holography

    B Javidi, T Nomura

    OPTICS LETTERS ( OPTICAL SOC AMER )  25 ( 1 ) 28 - 30   2000年01月

     概要を見る

    An information security method that uses a digital holographic technique is presented. An encrypted image is stored as a digital hologram. The decryption key is also stored as a digital hologram. The encrypted image can be electrically decrypted by use of the digital hologram of the key. This security technique provides secure storage and data transmission. Experimental results are presented to demonstrate the proposed method. (C) 2000 Optical Society of America.

    DOI

  • Securing information by use of digital holography

    B Javidi, T Nomura

    OPTICS LETTERS ( OPTICAL SOC AMER )  25 ( 1 ) 28 - 30   2000年01月

     概要を見る

    An information security method that uses a digital holographic technique is presented. An encrypted image is stored as a digital hologram. The decryption key is also stored as a digital hologram. The encrypted image can be electrically decrypted by use of the digital hologram of the key. This security technique provides secure storage and data transmission. Experimental results are presented to demonstrate the proposed method. (C) 2000 Optical Society of America.

    DOI

  • Securing information using a digital holographic technique

    T Nomura, B Javidi

    OPTICS IN COMPUTING 2000 ( SPIE-INT SOC OPTICAL ENGINEERING )  4089   619 - 624   2000年

     概要を見る

    An information security method that uses a digital holographic technique is presented. An encrypted image is stored as a digital hologram. The decryption key is also stored as a digital hologram. The encrypted image can be electrically decrypted by using the digital hologram of the key. This security technique is useful for secure storage and data transmission. Experimental results are presented to demonstrate the proposed method.

  • Programmable optical security systems using computer-generated holography

    T Nomura, B Javidi

    ALGORITHMS AND SYSTEMS FOR OPTICAL INFORMATION PROCESSING IV ( SPIE-INT SOC OPTICAL ENGINEERING )  4113   156 - 164   2000年

     概要を見る

    A double random phase optical encryption system that uses a binary key code is proposed. The key code is generated as a binary computer generated hologram. The binary key code call be displayed on a binary spatial light modulator such as a ferroelectric liquid crystal display. The use of a binary spatial light modulator enables us to renew the key at high speed. A joint transform correlator based on a photorefractive crystal in the Fourier domain is used to perform shift invariant encryption and decryption. Computer simulations of the effects of using a binary encoded key code instead of a complex amplitude key code are shown. Preliminary optical experimental results are presented to demonstrate the effectiveness of the proposed system.

    DOI

  • Programmable optical security systems using computer-generated holography

    T Nomura, B Javidi

    ALGORITHMS AND SYSTEMS FOR OPTICAL INFORMATION PROCESSING IV ( SPIE-INT SOC OPTICAL ENGINEERING )  4113   156 - 164   2000年

     概要を見る

    A double random phase optical encryption system that uses a binary key code is proposed. The key code is generated as a binary computer generated hologram. The binary key code call be displayed on a binary spatial light modulator such as a ferroelectric liquid crystal display. The use of a binary spatial light modulator enables us to renew the key at high speed. A joint transform correlator based on a photorefractive crystal in the Fourier domain is used to perform shift invariant encryption and decryption. Computer simulations of the effects of using a binary encoded key code instead of a complex amplitude key code are shown. Preliminary optical experimental results are presented to demonstrate the effectiveness of the proposed system.

    DOI

  • Polarization Encoding for Optical Security System

    Optical Processing & Information Systems (SPIE Int. Technical Group Newsletter)   11   8   2000年

  • Securing information using a digital holographic technique

    T Nomura, B Javidi

    OPTICS IN COMPUTING 2000 ( SPIE-INT SOC OPTICAL ENGINEERING )  4089   619 - 624   2000年

     概要を見る

    An information security method that uses a digital holographic technique is presented. An encrypted image is stored as a digital hologram. The decryption key is also stored as a digital hologram. The encrypted image can be electrically decrypted by using the digital hologram of the key. This security technique is useful for secure storage and data transmission. Experimental results are presented to demonstrate the proposed method.

  • Polarization Encoding for Optical Security System

    Optical Processing & Information Systems (SPIE Int. Technical Group Newsletter)   11   8   2000年

  • Polarization encoding for optical security systems

    B Javidi, T Nomura

    ALGORITHMS, DEVICES, AND SYSTEMS FOR OPTICAL INFORMATION PROCESSING III ( SPIE-INT SOC OPTICAL ENGINEERING )  3804   196 - 203   1999年

     概要を見る

    An idea for security verification of identification such as passports, credit cards, and others in terms of difficulty of reproduction is proposed The polarization information is used for security verification. As the state of the polarization encoded cannot be seen by an ordinary intensity sensitive device such as a CCD camera, it cannot be copied For optical validation system, a joint transform correlator is used. Computer simulations and optical experimental results are shown to confirm our proposed method.

  • High-Speed Optical Encryption Using Binary Encoding Algorithms

    1999 IEEE LEOS Annual Meeting Conference Proceedings     192 - 193   1999年

  • High-Speed Optical Encryption Using Binary Encoding Algorithms

    1999 IEEE LEOS Annual Meeting Conference Proceedings     192 - 193   1999年

  • Polarization Encoding for Optical Security System

    Proc. Soc. Photo-Opt. Instrum. Eng.   3804   196 - 203   1999年

  • Polarization Multiplexing for Information Security System

    1999 IEEE LEOS Annual Meeting Conference Proceedings     190 - 191   1999年

  • Optical encryption using joint transform correlator architecture for robust alignment

    T Nomura, B Javidi

    ALGORITHMS, DEVICES, AND SYSTEMS FOR OPTICAL INFORMATION PROCESSING III ( SPIE-INT SOC OPTICAL ENGINEERING )  3804   180 - 187   1999年

     概要を見る

    A novel architecture for the double random phase encoding optical encryption system using a joint transform correlator is proposed. In the proposed method, the joint power spectrum of the image to be encrypted and the key code is recorded as the encrypted power spectrum. Owing to the joint transform architecture, the alignment of the image and the key code is robust. Computer simulations using a computer generated hologram is presented to confirm our proposed system.

  • Optical encryption using joint transform correlator architecture for robust alignment

    T Nomura, B Javidi

    ALGORITHMS, DEVICES, AND SYSTEMS FOR OPTICAL INFORMATION PROCESSING III ( SPIE-INT SOC OPTICAL ENGINEERING )  3804   180 - 187   1999年

     概要を見る

    A novel architecture for the double random phase encoding optical encryption system using a joint transform correlator is proposed. In the proposed method, the joint power spectrum of the image to be encrypted and the key code is recorded as the encrypted power spectrum. Owing to the joint transform architecture, the alignment of the image and the key code is robust. Computer simulations using a computer generated hologram is presented to confirm our proposed system.

  • Polarization Multiplexing for Information Security System

    1999 IEEE LEOS Annual Meeting Conference Proceedings     190 - 191   1999年

  • Phase-encoded joint transform correlator to reduce the influence of extraneous signals

    T Nomura

    APPLIED OPTICS ( OPTICAL SOC AMER )  37 ( 17 ) 3651 - 3655   1998年06月

     概要を見る

    A technique to reduce the influence of the dc and the complex-conjugate correlation signals that are inherent in a joint transform correlator is proposed. The key part of this technique is the use of a phase mask. The mask contributes only extraneous signals, so the influence of the signals is reduced. The desirable correlation signal is not affected, and its shape is retained. Computer simulations confirm the performance of the proposed phase-encoded joint transform correlator. (C) 1998 Optical Society of America.

  • Application of phase-encoded joint transform correlator to optical encryption decoder

    T Nomura

    OPTICS IN COMPUTING 98 ( SPIE-INT SOC OPTICAL ENGINEERING )  3490   191 - 194   1998年

     概要を見る

    The application of a phase-encoded joint transform correlator to decryption of an optical image encryption system by a double-random phase encoding is described.

  • Encryption Using Joint-Transform Correlator Architecture for Robust Alignment

    Optical Processing & Computing (SPIE Int. Technical Group Newsletter)   9   4   1998年

  • Application of Phase-Encoded Joint Transform Correlator to Optical Encryption Decoder

    Proc. Soc. Photo-Opt. Instrum. Eng.   3490   191 - 194   1998年

  • Encryption Using Joint-Transform Correlator Architecture for Robust Alignment

    Optical Processing & Computing (SPIE Int. Technical Group Newsletter)   9   4   1998年

  • Phase-Encoded Joint Transform Correlator to Reduce the Influence of Extraneous Signals

    Appl. Opt.   37   3651 - 3655   1998年

  • Phase-encoded joint transform correlator as an optical encryption decoder

    T Nomura

    ALGORITHMS, DEVICES, AND SYSTEMS FOR OPTICAL INFORMATION PROCESSING ( SPIE-INT SOC OPTICAL ENGINEERING )  3466   246 - 252   1998年

     概要を見る

    The phase-encoded joint transform correlator as a decoder of an optical double random phase encoding system is described. By using the phase-encoded joint transform correlator, it is possible to decode the encrypted image with the same random phase mask which was used in the encryption procedure. The decoding algorithm and optical systems are described. Computer simulations confirm the proposed decoding algorithm.

    DOI

  • Phase-encoded joint transform correlator as an optical encryption decoder

    Takanori Nomura

    Proceedings of SPIE - The International Society for Optical Engineering ( SPIE )  3466   246 - 252   1998年

     概要を見る

    The phase-encoded joint transform correlator as a decoder of an optical double random phase encoding system is described. By using the phase-encoded joint transform correlator, it is possible to decode the encrypted image with the same random phase mask which was used in the encryption procedure. The decoding algorithm and optical systems are described. Computer simulations confirm the proposed decoding algorithm.

    DOI

  • Layered blind deconvolution using subband filter banks

    T Nomura, M Tamaru

    OPTICAL REVIEW ( OPTICAL SOC JAPAN )  4 ( 1B ) 164 - 166   1997年01月

     概要を見る

    A blind deconvolution method using the concept of subband filter banks has been proposed. This method makes possible the speedy convergence of solution, due to estimation of supports of the reconstructed images by a deconvolution in the lower layer. We apply the method to blind deconvolution by a simulated annealing algorithm and confirm its usefulness.

    DOI

  • Layered blind deconvolution using subband filter banks

    T Nomura, M Tamaru

    OPTICAL REVIEW ( OPTICAL SOC JAPAN )  4 ( 1B ) 164 - 166   1997年01月

     概要を見る

    A blind deconvolution method using the concept of subband filter banks has been proposed. This method makes possible the speedy convergence of solution, due to estimation of supports of the reconstructed images by a deconvolution in the lower layer. We apply the method to blind deconvolution by a simulated annealing algorithm and confirm its usefulness.

    DOI

  • サブバンド・フィルタ・バンクを用いた階層型ブラインド・デコンボリューション(共著)

      4 ( 1B ) 164   1997年

  • Diffraction grating using a colloidal liquid of magnetic particles and its characteristics

    T Nomura, M Fujigaki, Y Morimoto

    17TH CONGRESS OF THE INTERNATIONAL COMMISSION FOR OPTICS: OPTICS FOR SCIENCE AND NEW TECHNOLOGY, PTS 1 AND 2 ( SPIE - INT SOC OPTICAL ENGINEERING )  2778   487 - 488   1996年

  • 磁性流体を用いた回折格子とその特徴

      2778   487   1996年

  • Layered Blind Deconvolution Using Subband Filter Banks

    NOMURA T.

    Technical Digest of 1996 International Topcial Meeting on Optical Computing   1   196 - 197   1996年

  • Layered Blind Deconvolution Using Subband Filter Banks

    Technical Digest of 1996 International Topcial Meeting on Optical Computing     196   1996年

  • 階層型ブラインド・デコンボリューション

        196   1996年

  • Diffraction grating using a colloidal liquid of magnetic particles and its characteristics

    T Nomura, M Fujigaki, Y Morimoto

    17TH CONGRESS OF THE INTERNATIONAL COMMISSION FOR OPTICS: OPTICS FOR SCIENCE AND NEW TECHNOLOGY, PTS 1 AND 2 ( SPIE - INT SOC OPTICAL ENGINEERING )  2778   487 - 488   1996年

  • HAAR WAVELET TRANSFORM WITH INTERBAND PREDICTION AND ITS APPLICATION TO IMAGE-CODING

    N KUROKI, M NUMA, T NOMURA, M KAMEDA, K HIRANO

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE ( SCRIPTA TECHNICA PUBL )  78 ( 4 ) 103 - 114   1995年04月

     概要を見る

    Although the discrete cosine transform (DCT) and wavelet transform have been used as effective techniques for reducing the redundancy of image waveforms, they have the problems of high complexity and causing block distortion. Tn this paper, a Haar wavelet transform with interband prediction is proposed that permits high-speed processing and which is suitable for coding as a subband decomposition technique since it generates little block distortion in the decoded images. The interband prediction method of this proposed transform method uses the derivative of the low-band waveform to predict the high-band waveform each time a band is split into two subbands. This results in a transform process that gives a prediction residual signal with lower entropy. During the inverse transform, the prediction coefficients obtained from the forward transform are used to predict the high-frequency waveforms and then, by adding the prediction residual, the original high frequency waveforms are reconstructed. Because the high-frequency waveforms are generated that smoothly interpolate the up-sampled, low-frequency waveforms, any block effects from this prediction technique are difficult to see in the decoded image. A detailed analysis of the proposed interband prediction process is performed by interpreting the proposed transform as a subband decomposition process that is based on the use of a symmetric short-kernel filter (SSKF) filter bank; then experiments are conducted that demonstrate its performance as a subband decomposition for coding of real image data and the possibility of progressive build-up of the decoded images. Results show that this transform method is effective for coding image data.

  • HAAR WAVELET TRANSFORM WITH INTERBAND PREDICTION AND ITS APPLICATION TO IMAGE-CODING

    N KUROKI, M NUMA, T NOMURA, M KAMEDA, K HIRANO

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE ( SCRIPTA TECHNICA PUBL )  78 ( 4 ) 103 - 114   1995年04月

     概要を見る

    Although the discrete cosine transform (DCT) and wavelet transform have been used as effective techniques for reducing the redundancy of image waveforms, they have the problems of high complexity and causing block distortion. Tn this paper, a Haar wavelet transform with interband prediction is proposed that permits high-speed processing and which is suitable for coding as a subband decomposition technique since it generates little block distortion in the decoded images. The interband prediction method of this proposed transform method uses the derivative of the low-band waveform to predict the high-band waveform each time a band is split into two subbands. This results in a transform process that gives a prediction residual signal with lower entropy. During the inverse transform, the prediction coefficients obtained from the forward transform are used to predict the high-frequency waveforms and then, by adding the prediction residual, the original high frequency waveforms are reconstructed. Because the high-frequency waveforms are generated that smoothly interpolate the up-sampled, low-frequency waveforms, any block effects from this prediction technique are difficult to see in the decoded image. A detailed analysis of the proposed interband prediction process is performed by interpreting the proposed transform as a subband decomposition process that is based on the use of a symmetric short-kernel filter (SSKF) filter bank; then experiments are conducted that demonstrate its performance as a subband decomposition for coding of real image data and the possibility of progressive build-up of the decoded images. Results show that this transform method is effective for coding image data.

  • INCOHERENT-ONLY JOINT-TRANSFORM CORRELATOR

    T NOMURA, Y YOSHIMURA, K ITOH, Y ICHIOKA

    APPLIED OPTICS ( OPTICAL SOC AMER )  34 ( 8 ) 1420 - 1425   1995年03月

     概要を見る

    An incoherent-only optical and electronic digital joint-transform correlator is proposed. A technique for the removal of extraneous signals inherent in the incoherent-only joint-transform correlator is also presented. A computer simulation and experimental results confirm the performance of the proposed incoherent-only joint-transform correlator.

  • INCOHERENT-ONLY JOINT-TRANSFORM CORRELATOR

    T NOMURA, Y YOSHIMURA, K ITOH, Y ICHIOKA

    APPLIED OPTICS ( OPTICAL SOC AMER )  34 ( 8 ) 1420 - 1425   1995年03月

     概要を見る

    An incoherent-only optical and electronic digital joint-transform correlator is proposed. A technique for the removal of extraneous signals inherent in the incoherent-only joint-transform correlator is also presented. A computer simulation and experimental results confirm the performance of the proposed incoherent-only joint-transform correlator.

  • Calculation of correlation and convolution using filter banks

    Proceedings of the 26th Joint Conference on Imaging Technology     179   1995年

  • Calculation of correlation and convolution using filter banks

    Proceedings of the 26th Joint Conference on Imaging Technology     179   1995年

  • フィルタ・バンクを用いた相関・合成積関数の算出法(共著)

    第26回画像工学コンファレンス論文集     179   1995年

  • Blind deconvolution for images with discrete gray levels

    Proceedings of the 25th Joint Conference on Imaging Technology     125   1994年

  • 階調数を限定した画像のブラインド・デコンボリューション(共著)

    第25回画像工学コンファレンス論文集     125   1994年

  • Haar Wavelet Transform with Inter Band Prediction and Its Application to Image Coding

    The Transactions on the Institute of Electronics, Information and Communication Engineers A   J77-A ( 12 ) 1738   1994年

  • Blind deconvolution for images with discrete gray levels

    Proceedings of the 25th Joint Conference on Imaging Technology     125   1994年

  • 帯域間予測を用いたハール・ウェーブレット変換と画像符号化への応用(共著)

    電子情報通信学会論文誌A   J77-A ( 12 ) 1738   1994年

  • Haar Wavelet Transform with Inter Band Prediction and Its Application to Image Coding

    The Transactions on the Institute of Electronics, Information and Communication Engineers A   J77-A ( 12 ) 1738   1994年

  • ハール・ウェーブレット変換を用いたエッジ抽出パターン認識(共著)

    第24回画像工学コンファレンス論文集   211-214   1993年

  • Pattern Recognition Using Haar Wavelet Transform

    Proceedings of the 24th Joint Conference on Imaging Technology   211-214   1993年

  • Movie Industry System Based on B-ISDN and its Economics(jointly worked)

    王 昌正, 冨田 昌宏, 野村 孝徳, 平野 浩太郎, 加護野 忠男

    Memoirs of Graduate School of Science and Technology, Kobe University ( 神戸大学 )  11 ( B ) 85 - 96   1993年

  • Pattern Recognition Using Haar Wavelet Transform

    Proceedings of the 24th Joint Conference on Imaging Technology   211-214   1993年

  • Movie Industry System Based on B-ISDN and Its Economics

    王 昌正, 冨田 昌宏, 野村 孝徳, 平野 浩太郎, 加護野 忠男

    神戸大学大学院自然科学研究科紀要. A ( 神戸大学 )  11 ( B ) 85 - 96   1993年

  • Lossless Coding for Cobr Images Based on Three-Dimensional Linear Prediction

    Proceedings of the 23rd Joint Conference on Imaging Technology   357-360   1992年

  • Lossless Coding for Cobr Images Based on Three-Dimensional Linear Prediction

    Proceedings of the 23rd Joint Conference on Imaging Technology   357-360   1992年

  • Lossless Image Compression by Two-Dimensional Linear Prediction with Variable Coefficients(jointly worked)

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E75-A ( 7 )   1992年

  • 3次元線形予測を用いたデジタルカラー静止画像の無歪圧縮(共著)

    第23回画像工学コンファレンス論文集   357-360   1992年

  • Lossless Image Compression by Two-Dimensional Linear Prediction with Variable Coefficients(jointly worked)

    KUROKI N.

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E75-A ( 7 ) 882 - 889   1992年

  • High-Speed Image Transmission through ISDN

    Proceedings of the 22nd Joint Conference on Imaging Technology     1991年

  • ISDNによる高速画像通信(共著)

    第22回画像工学コンファレンス論文集     1991年

  • High-Speed Image Transmission through ISDN

    Proceedings of the 22nd Joint Conference on Imaging Technology     1991年

  • DESIGNING A BINARY FOURIER-PHASE-ONLY CORRELATION FILTER USING A SIMULATED ANNEALING ALGORITHM

    T NOMURA, T NAGASE, K ITOH, Y ICHIOKA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS ( JAPAN SOC APPLIED PHYSICS )  29 ( 11 ) L2074 - L2076   1990年11月

  • DESIGNING A BINARY FOURIER-PHASE-ONLY CORRELATION FILTER USING A SIMULATED ANNEALING ALGORITHM

    T NOMURA, T NAGASE, K ITOH, Y ICHIOKA

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS ( JAPAN SOC APPLIED PHYSICS )  29 ( 11 ) L2074 - L2076   1990年11月

  • HARTLEY TRANSFORMATION FOR HYBRID PATTERN-MATCHING

    T NOMURA, K ITOH, Y ICHIOKA

    APPLIED OPTICS ( OPTICAL SOC AMER )  29 ( 29 ) 4345 - 4350   1990年10月

    DOI

  • HARTLEY TRANSFORMATION FOR HYBRID PATTERN-MATCHING

    T NOMURA, K ITOH, Y ICHIOKA

    APPLIED OPTICS ( OPTICAL SOC AMER )  29 ( 29 ) 4345 - 4350   1990年10月

    DOI

  • BINARY FOURIER PHASE-ONLY CORRELATION

    T NOMURA, K ITOH, K MATSUOKA, Y ICHIOKA

    OPTICS LETTERS ( OPTICAL SOC AMER )  15 ( 14 ) 810 - 811   1990年07月

    DOI

  • BINARY FOURIER PHASE-ONLY CORRELATION

    T NOMURA, K ITOH, K MATSUOKA, Y ICHIOKA

    OPTICS LETTERS ( OPTICAL SOC AMER )  15 ( 14 ) 810 - 811   1990年07月

    DOI

  • Incoherent-holographic hybrid image processing

    Takanori Nomura, Kazuyoshi Itoh, Yoshiki Ichioka

    Proceedings of SPIE - The International Society for Optical Engineering   1183   619 - 624   1990年04月

     概要を見る

    We present the principle and implementations of high-speed pattern matching with the incoherent holographic technique along with its experimental results. © 1990, SPIE.

    DOI

  • Incoherent-holographic hybrid image processing

    Takanori Nomura, Kazuyoshi Itoh, Yoshiki Ichioka

    Proceedings of SPIE - The International Society for Optical Engineering   1183   619 - 624   1990年04月

     概要を見る

    We present the principle and implementations of high-speed pattern matching with the incoherent holographic technique along with its experimental results. © 1990, SPIE.

    DOI

  • Analysis of a multiple-object binary phase only correlator(jointly worked)

    Proceedings of the Society of Photo-Optical Instrumentation Engineers   1359   1990年

  • Analysis of a multiple-object binary phase only correlator(jointly worked)

    Proceedings of the Society of Photo-Optical Instrumentation Engineers   1359   1990年

  • HYBRID HIGH-SPEED PATTERN-MATCHING USING A BINARY INCOHERENT HOLOGRAM GENERATED BY A ROTATIONAL SHEARING INTERFEROMETER

    T NOMURA, K ITOH, Y ICHIOKA

    APPLIED OPTICS ( OPTICAL SOC AMER )  28 ( 23 ) 4987 - 4991   1989年12月

  • HYBRID HIGH-SPEED PATTERN-MATCHING USING A BINARY INCOHERENT HOLOGRAM GENERATED BY A ROTATIONAL SHEARING INTERFEROMETER

    T NOMURA, K ITOH, Y ICHIOKA

    APPLIED OPTICS ( OPTICAL SOC AMER )  28 ( 23 ) 4987 - 4991   1989年12月

  • Hybrid Pattern Matching Using Binary Incoherent Hologram Gererated by Common-Path Radial-Shear Interferometer

    Proceedings of the 19th Joint Conference on Imaging Technology     1988年

  • 共通光路干渉計によるバイナリーインコヒーレントホログラムを用いたハイブリッドパターンマッチング(共著)

    第19回画像工学コンファレンス論文集     1988年

  • Optical-Digital Hybrid Processor for High-Speed Pattern Matching(jointly worked)

    Proceedings of the Society of Photo-Optical Instrumentation Engineers   963   1988年

  • Optical-Digital Hybrid Processor for High-Speed Pattern Matching(jointly worked)

    Proceedings of the Society of Photo-Optical Instrumentation Engineers   963   1988年

  • Hybrid Pattern Matching Using Binary Incoherent Hologram Gererated by Common-Path Radial-Shear Interferometer

    Proceedings of the 19th Joint Conference on Imaging Technology     1988年

▼全件表示

Works

  • 織編物の光学的透過特性に関する研究

    2005年

受賞(研究活動に関するもの)

  • HODIC 鈴木・岡田記念賞

    受賞者:  野村孝徳

    2023年06月   日本光学会ホログラフィック・ディスプレイ研究会  

  • Fellow

    受賞者:  野村孝徳

    2022年01月   OPTICA  

  • Fellow

    受賞者:  野村孝徳

    2014年03月   SPIE  

  • 第19回画像工学コンファレンス優秀ポスタ賞

    受賞者:  野村孝徳,伊東一良,一岡芳樹

    1988年    

講演・口頭発表等

  • Phase-modulated digital holography: a parallel phase-shifting and single-pixel imaging

    Takanori Nomura  [招待有り]

    the third international computing imaging conference (CITA2023)  2023年06月03日  

  • Single-shot in-line Fresnel incoherent correlation holography using a dual-focus checkerboard lens

    Takanori Nomura  [招待有り]

    Photonics Asia 2022  2022年11月29日  

  • 深層学習を用いた振幅型バイナリホログラムおよび多値ホログラム

    野村孝徳, 後井宏亮  [招待有り]

    2022年第4回ホログラフィック・ディスプレイ研究会  2022年11月28日  

  • Lensless photography with a random mask

    Takanori Nomura  [招待有り]

    2022 Fio LS  2022年10月19日  

  • Comparison of Different Scanning Manners in Optical Scanning Holography Based on Compressive Sensing

    Masamitsu Sugimoto, Naru Yoneda, Yusuke Saita, Takanori Nomura

    ODF’22  2022年08月04日  

  • Reduction of Memory Usage by a Point Spread Function Undersampling in Lensless Photography with a Random Amplitude Mask

    Junki Toda, Takanori Nomura

    ODF’22  2022年08月04日  

  • インコヒーレントディジタルホログラフィ~原理とその実現例~

    野村孝徳  [招待有り]

    次世代画像入力ビジョンシステム部会定例会  2022年03月23日  

  • Experimental Verification of Common-path Off-axis Signle-pixel Holographic Imaging

    Naru Yoneda, Yusuke Saita, Takanori Nomura

    IWH2021  2022年03月  

  • Evaluation of Axial Resolution in Holographic Data Storage Based on Compressive Sensing

    Naru Yoneda, Yusuke Saita, Takanori Nomura

    ODF'20  2021年06月  

  • Are you happy with quantitative phase imaging?

    Takanori Nomura  [招待有り]

      2020年12月  

  • ingle-Shot Phase Imaging Techniques Based on Parallel Optical Information Processing

    Takanori Nomura, Naru Yoneda, Yusuke Saita  [招待有り]

    Optics & Photonics Taiwan International Conference (OPTIC)  2020年12月  

  • Single Shot Phase Imaging Based on Higher Order Transport-of-IntensityEquation Using a Computer-Generated Hologram

    Aoi Onishi, Naru Yoneda, Yusuke Saita, and Takanori Nomura,

    ISOM ’20  2020年11月  

  • Compressive spectral imaging with a blazed grating to improve the signal-to-noise ratio

    Daiki Shimoyama, Yusuke Saita, and Takanori Nomura,

    OSJ-OSA-OSK Joint Symposia on Optics Program  2020年11月  

  • ransport of Intensity Phase Data-Page Acquisition with Polarization Directed Flat Lens in Coaxial Holographic Data Storage

    Yuta Takahashi, Yusuke Saita, Naru Yoneda, Takanori Nomura

    ISOM ’20  2020年11月  

  • Phase data acquisition and multiplexing techniques for in-line holographic data storage based on computer-generated holograms

    Yusuke Saita, Naru Yoneda, Aoto Matsumoto, Takanori Nomura  [招待有り]

    ISOM ’20  2020年11月  

  • Imaging through scattering media by motionless optical scanning holography

    Naru Yoneda, Yusuke Saita, and Takanori Nomura,

    OSJ-OSA-OSK Joint Symposia on Optics Program  2020年11月  

  • valuation of Spatial Resolution in Motionless Optical Scanning Holography

    Naru Yoneda, Yusuke Saita, Takanori Nomura

    ISOM ’20  2020年11月  

  • Twin-Image Reduction of Low-Coherence In-Line Digital Holography Using a Diffuser

    Kenya Kawano and Takanori Nomura

    ISOM ’20  2020年11月  

  • Coaxial holographic memory to increase recording capacity using computer-generated hologram

    Takanori Nomura, Naru Yoneda, and Yusuke Saita,  [招待有り]

    International Conference on Optoelectronic and Microelectronic Technology and Application 2020  2020年10月  

  • Simultaneous measurement of two parameters of the spherical lens by low-coherence interferometry

    Ying Sun, Takanori Nomura

    Proceedings of SPIE - The International Society for Optical Engineering  2020年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    To measure different parameters of a spherical lens simultaneously, a method by low-coherence interferometry with a low temporal coherent light source is proposed. This proposed method can obtain both the radius of curvature and the central thickness of a spherical lens in a single optical system. Owing to the property of low temporal coherence, the contrast of interference fringe pattern, hologram, varies with the optical path difference of an object beam and a reference beam. This enables the central thickness of the test lens to acquire with a Michelson interferometer. Simultaneously, the spherical shape of the test lens, namely the radius of curvature, can be obtained from a hologram which contains information of the wavefront curvature from the reected beam of the spherical surface of the test lens.

  • Numerical evaluation of transport-of-intensity phase imaging with oblique illumination for refractive index tomography

    Koshi Komuro, Yusuke Saita, Yosuke Tamada, Takanori Nomura

    Proceedings Digital Holography and Three-Dimensional Imaging 2019  2019年05月13日  

     概要を見る

    A scanless phase retrieval method based on the transport of intensity equation is proposed for refractive index tomography. A phase distribution is measured from defocused intensity distributions obtained with oblique illumination of different tilt angles.

  • Phase imaging in-line digital holography with random phase modulation

    Takanori Nomura

    Proceedings of SPIE - The International Society for Optical Engineering  2019年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    In-line digital holography using a random phase modulation is proposed. Owing to the random phase modulation, twin-image problem inherent to the in-line optical setup is relieved. Furthermore, because no multiplexed recording is required, dynamic phenomena can be recorded. This idea is inspired by double-random phase- encryption. The difference between the proposed method and the double-random phase-encryption is brie y described. Preliminary experimental results confirm the feasibility of the proposed method. The difference of coherence of a light source is also discussed.

  • Computer-generated-hologram-based holographic data storage using a transport of intensity equation

    Naru Yoneda, Yusuke Saita, Koshi Komuro, Teruyoshi Nobukawa, Takanori Nomura

    Optics InfoBase Conference Papers  2018年  

     概要を見る

    Utilization of phase information can increase the recording density of holographic data storage. In this paper, a transport of intensity equation is introduced to computer-generated-hologram-based holographic data storage, which can obtain the phase datapage while keeping an optical setup simple and compact. Moreover, two defocused intensity distributions for the transport of intensity equation can be simultaneously obtained by using a conjugate beam from the computer-generated hologram.

  • Deep-learning-based phase retrieval for pure phase objects in computational ghost imaging

    Koshi Komuro, Alexandre Goy, Takanori Nomura, George Barbastathis

    Optics InfoBase Conference Papers  2018年  

     概要を見る

    A deep-learning-based phase retrieval method is proposed for computational ghost imaging (CGI). In the method, a defocused intensity distribution of an object is obtained by the CGI. An object's phase distribution is retrieved from the intensity distribution by a trained deep neural network. The advantage of the method is that the phase retrieval can be achieved with a low signal to noise ratio. The effects of noise level and defocus distance are investigated.

  • Random amplitude or phase modulation for three-dimensional sensing and imaging

    Takanori Nomura

    Proceedings of SPIE - The International Society for Optical Engineering  2018年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    Three-dimensional imaging is very attractive for biomedical fields, industrial inspecting, and so on. Computational optical sensing and imaging is widely studied due to the recent development of imaging device, computational power, and so on. It is also used for three-dimensional sensing and imaging. In this area, random amplitude or phase modulation is introduced to improve its performance. In this paper, computational ghost imaging using a designed random amplitude modulation is presented. Owing to the designed random amplitude modulation, the number of measurements can be reduced. A phase modulation for twin image reduction of in-line digital holography is also presented. Owing to the random phase modulation, the overlapping an object image and its conjugate image can be reduced.

  • Single-shot in-line digital holography without twin image

    Takanori Nomura

    Proceedings of SPIE - The International Society for Optical Engineering  2018年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    In-line digital holography is conventional but still attractive because of its simple optical setup. In general, sequential phase-shifting technique is mandatory to remove twin-image which makes the reconstructed image quality low. However, sequential phase-shifting technique requires multiple recording. Multiple recording means that it is not suitable for a dynamic phenomenon. In this paper, two kinds of a single-shot in-line digital holography without twin-image using a diffused illumination are presented. One is a generalized phase-shifting digital holography and the other is a computational removal of twin-image. The ideas and their experimental results are given to confirm the feasibility.

  • Transport of intensity phase imaging for pure phase objects in computational ghost imaging

    Koshi Komuro, Yuya Yamazaki, Takanori Nomura

    Proceedings of SPIE - The International Society for Optical Engineering  2018年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    Computational ghost imaging (CGI) is expected to be applied to noninvasive biomedical imaging because of its characteristic which allows us to obtain the object's image under a low signal to noise ratio (SNR) condition. However only an amplitude distribution can be obtained by the CGI. Therefore the imaging of the pure phase objects is difficult. Although the phase shifting digital holography has been used for reconstruction of the complex amplitude in the CGI, its experimental setup is cumbersome and sensitive to vibrations. Furthermore four holograms are required for the reconstruction of the complex amplitude because of the phase shifting algorithm, rendering the acquisition time of the phase image slow. Therefore the method is difficult to be applied to the biomedical imaging. An alternative non-interferometric method is proposed in this study. The proposed method uses the transport of intensity equation for the phase retrieval of the pure phase objects, termed transport-of-intensity CGI (TI-CGI). In the TI-CGI, the phase distribution is retrieved from a single defocused image obtained by a modulated optical setup of the CGI, achieving the fast and robust imaging compared with the conventional phase shifting method. Therefore the TI-CGI may be more suitable for the biomedical imaging than the phase shifting method. The TI-CGI is demonstrated by an optical experiment under the low SNR condition generated by the neutral density filters with 1% and 0.1% transmittance. The experimental results conform the effectiveness of the TI-CGI.

  • Large dynamic range wavefront sensing using Shack-Hartmann wavefront sensor based on pattern correlations

    Saita Yusuke, Nomura Takanori

    OPTICAL DESIGN AND TESTING VIII  2018年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    Wavefront sensing techniques are mainly needed in an adaptive optics system for high resolution imaging. One of them is a Shack-Hartmann method which is composed of very simple structure. Although the method is widely utilized, it also has the limitation for the measurable magnitude of wavefront aberrations. To overcome the problem, the improved Shack-Hartmann method for larger aberrated wavefronts has been proposed. In this paper, the principle of the proposed method and the numerical evaluation of the performance of the proposed method are presented.

  • Multimodal Imaging Based on Digital Holography

    Osamu Matoba, Xiangyu Quan, Peng Xia, Yasuhiro Awatsuji, Takanori Nomura

    Proceedings of the IEEE  2017年05月   IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

     概要を見る

    Digital holography provides a method of the 3-D recording and numerical reconstruction by a simple optical system and a computer. Quantitative measurement and numerical refocusing are major characteristics. So far, many physical parameters such as amplitude, phase, polarization, fluorescence, and spectra can be obtained independently. Recently, multimodal imaging that can obtain simultaneously two or more physical parameters by combining digital holographic microscope and other optical microscopes such as a fluorescence optical microscope and a Raman scattering microscope has emerged. In this review, physical parametric imaging techniques based on digital holography are presented and then these techniques are enhanced to develop multimodal imaging based on digital holography.

  • Spatially incoherent Fourier digital holography

    Takanori Nomura, Kaho Watanabe

    Proceedings of SPIE - The International Society for Optical Engineering  2017年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    The possibility of incoherent digital holography has been widely studied because it is free from coherent light sources. Here spatially incoherent Fourier digital holography is described. The incoherent hologram is obtained by a rotational shearing interferometer. The hologram obtained by the interferometer is a cosine transform of a spatially incoherent object. After describing the principle of a rotational shearing interferometer, methods to obtain Fourier transform of an object presented.

  • Phase object mapping based on a complex amplitude measurement by transport of intensity equation

    Koshi Komuro, Takanori Nomura

    Optics InfoBase Conference Papers  2017年   OSA - The Optical Society

     概要を見る

    A phase object mapping technique is proposed to measure a phase distribution of objects which exist in different depth positions. The proposed method is confirmed by a numerical simulation.

  • カラー撮像素子を用いた3バンド像面フーリエ分光映像法

    谷口 祐太, 野村 孝徳

    応用物理学会学術講演会講演予稿集  2016年09月01日   公益社団法人 応用物理学会

  • Incoherent holography by a Michelson type interferometer with a lens for a radial shear

    Kaho Watanabe, Takanori Nomura

    THREE-DIMENSIONAL IMAGING, VISUALIZATION, AND DISPLAY 2016  2016年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    The modified Michelson type interferometer with lenses for a radial shear to record incoherent holograms is proposed. It enables us to record a hologram by self-interference without coherent illumination such as a laser. The interferometer has two wave plates which can realize phase-shifting incoherent holography. The feature can avoid a very large bias term and the twin image, which are the inherent problem of incoherent holography by self-interference. The advantages of the proposed method using lenses and wave plates are easy adjustment of the zone plate and simplification of the optical system. A preliminary experiment using an LED as an incoherent object was performed to confirm the four step phase-shifting by wave plates.

  • Numerical evaluation of shift multiplexing using a spherical wave in a holographic memory based on a computer-generated hologram

    Teruyoshi Nobukawa, Takanori Nomura

    OPTICAL DATA STORAGE 2016  2016年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    Shift multiplexing method using a spherical wave is proposed for a holographic memory system based on a computer-generated hologram (CGH). In the proposed method, a propagated signal beam along an optical axis is generated by a CGH. The zero order beam of the CGH is obtained as a point source in the Fourier plane. This point source becomes a spherical reference beam on a recording medium by displacing a Fourier transform lens. The use of the spherical reference beam allows us to implement shift multiplexing in the holographic memory based on a CGH. Shift selectivity of the proposed method is numerically evaluated. In addition, shift multiplexing with the proposed method is numerically demonstrated.

  • Generalized phase-shifting color digital holography

    Takanori Nomura, Takaaki Kawakami, Kazuma Shinomura

    THREE-DIMENSIONAL IMAGING, VISUALIZATION, AND DISPLAY 2016  2016年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    Two methods to apply the generalized phase-shifting digital holography to color digital holography are proposed. One is wave-splitting generalized phase-shifting color digital holography. This is realized by using a color Bayer camera. Another is multiple exposure generalized phase-shifting color digital holography. This is realized by the wavelength-dependent phase-shifting devices. Experimental results for both generalized phase-shifting color digital holography are presented to confirm the proposed methods.

  • Holographic storage system based on digital holography for recording a phase data page in a compact optical setup

    Teruyoshi Nobukawa, Takanori Nomura

    PRACTICAL HOLOGRAPHY XXX: MATERIALS AND APPLICATIONS  2016年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    A holographic storage system based on digital holography is proposed for recording and retrieving a phase data page in a compact and simple optical setup. In the proposed recording system, complex amplitude distribution can be modulated using a single phase-only spatial light modulator. The complex amplitude distribution of a retrieved phase data page is detected with the Fourier fringe analysis. The use of digital holographic techniques enables realizing a compact and simple holographic recording system, which is independent of misalignment problem in conventional holographic storage systems. The capability of the proposed recording system is numerically and experimentally evaluated.

  • Holographic Data Storage by Use of Computer Generated Hologram

    Nomura, Takanori, Nobukawa, Teruyoshi

    2016 ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE (ACP)  2016年   IEEE

     概要を見る

    Arbitrary pattern in an arbitrary domain can be realized by computer generated hologram (CGH). If CGH is applied to the optical data storage, the complexity of the optical system can be eased. For example, a single spatial light modulator (SLM) can be used to express a fully-complex filed of a lightwave. Holographic data storage with a single amplitude SLM by use of CGH is presented. A signal beam and a reference beam are generated by a computer generated hologram (CGH). Owing to the characteristics of the CGH, the incident angle of a reference beam can be changed. This means that angular multiplexing is available.

  • Generalized phase-shifting digital holography for single-exposure

    Takanori Nomura, Masatoshi Imbe

    INTERNATIONAL CONFERENCE ON PHOTONICS SOLUTIONS 2015  2015年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    Single exposure phase-shifting digital holography is mandatory for recording/analyzing dynamic phenomena. As one of the candidate for the single exposure phase-shifting digital holography is the wave-splitting phase-shifting digital holography. We have proposed generalized phase-shifting digital holography as one of the wave-splitting phase-shifting digital holography. In the digital holography, the phase-shift quantity, which corresponds to the difference between the phase quantities of the reference wave on the adjacent pixels is generalized different from ordinal wave-splitting methods. Owing to the generalized phase-shifting, we can use a random-phase wave as the reference wave. The proposed phase-shifting digital holography enables us to record a fully-complex field of a dynamic phenomena without dc and conjugate terms using a commercially available optical devices. The relation between the property of the reference wave and the quality of the reconstructed images are discussed. Experimental results are given to confirm the proposed phase-shifting digital holography.

  • Expansion of dynamic range in Shack-Hartmann wavefront sensor using dual microlens array

    Hironobu Shinto, Yusuke Saita, Takanori Nomura

    Progress in Biomedical Optics and Imaging - Proceedings of SPIE  2015年   SPIE

     概要を見る

    A Shack-Hartmann wavefront sensor (SHWFS) which consists of a microlens array and an image sensor has been used to measure the wavefront aberrations in various fields owing to its advantages such as simple configuration. However, a conventional SHWFS has the finite dynamic range. The dynamic range cannot be expanded without sacrificing the spatial resolution and the sensitivity in a conventional SHWFS. In this study, the SHWFS using a dual microlens array to solve the problem is proposed. In the proposed method, an astigmatic microlens is arranged at the center of a group of 2 x 2 spherical microlenses. A pattern image including spots and linear patterns is obtained at the focal plane by the dual microlens array. The pattern image can be separated into two images as if two microlens array with different diameter were used by discriminating spots from linear patterns with the pattern matching technique. The proposed method enables to expand the dynamic range of an SHWFS by using the separated two images. The performance of the proposed method is confirmed by the numerical simulation for measuring a spherical wave.

  • Mueller matrix imaging by use of digital holography

    Takanori Nomura, Toshitaka Kobata

    2015 INTERNATIONAL CONFERENCE ON OPTICAL INSTRUMENTS AND TECHNOLOGY: OPTOELECTRONIC MEASUREMENT TECHNOLOGY AND SYSTEMS  2015年   SPIE-INT SOC OPTICAL ENGINEERING

     概要を見る

    A Mueller matrix imaging method by use of the characteristics of digital holography is proposed. In the proposed method, only two exposures are required to obtain the Mueller matrix. The Mueller matrix can be calculated from Stokes vectors. Stokes vectors can be obtained from two fully-complex amplitude distributions. Fully complex amplitude distributions can be obtained by digital holography. The optical experiments by using two kinds of specimens which are four linear polarizers and a quarter wave plate are shown to demonstrate the proposed method.

  • Multiwavelengths holgoraphic image fusion using 2D discrete wavelet transform

    Proc. Soc. Photo-Opt. Instrum. Eng.  2005年  

  • Hybrid optical encryption of a three-dimensional object

    Optics in Information Systems (SPIE Int. Technical Group Newsletter)  2005年  

  • Quasi one-shot phase-shifting digital holography

    Takanori Nomura, Shinji Murata, Eiji Nitanai, Takuhisa Numata

    Proceedings of SPIE - The International Society for Optical Engineering  2005年  

     概要を見る

    The quasi one-shot phase-shifting digital holography using phase difference of orthogonal polarizations is proposed. The use of orthogonal polarizations can make it possible to record two phase-shifted holograms simultaneously. By combining the holograms with distributions of a reference wave and an object wave, the complex field of the wavefront of a 3D object can be obtained. As two phase-shifted holograms can be obtained simultaneously in the proposed method, even a moving object can be recorded.

  • Optical encryption based on the input phase mask designed for the space bandwidth of the optical system

    Takanori Nomura, Bahram Javidi

    Proceedings of SPIE - The International Society for Optical Engineering  2005年  

     概要を見る

    To improve the image quality of the decrypted image through the double-random phase-encoding optical encryption, the design method of the input phase mask is proposed. The input phase mask is iteratively designed so that the extent of the Fourier spectrum of the product of an input image and the input phase mask matches to the space bandwidth of the optical system. By using the designed input phase mask, we show that the bit-error rate is improved. We also discuss the number of the phase levels of the designed input phase mask.

▼全件表示

特許

  • デジタルホログラフィを利用した変位分布計測方法

    特許番号: 4069204

    登録日: 2008年01月25日 

    出願日: 2004年03月16日 ( 特願2004-74444 )   公開日: 2005年09月29日 ( 特開2005-265441 )  

    発明者: 森本吉春、野村孝徳、藤垣元治、高橋功  出願人: 国立大学法人和歌山大学

  • 応力分布計測方法

    特許番号: 3362182

    登録日: 2002年12月25日 

    出願日: 2000年07月06日 ( 特願2000-204573 )   公開日: 2002年01月23日 ( 特開2002-22559 )  

    発明者: 森本吉春、野村孝徳、藤垣元治、松井亮  出願人: 国立大学法人和歌山大学

  • 光学装置、撮像システム、分析システム、方法、及び空間光変調素子

    出願日: 2019年12月12日 ( 特願2019-224774 )   公開日: 2021年06月17日 ( 特開2021-92732 )  

    発明者: 最田裕介、野村孝徳、米田成  出願人: 国立大学法人和歌山大学

  • 布帛の透け難さの評価方法

    出願日: 2008年04月30日 ( 特願2008-118142 )   公開日: 2009年11月12日 ( 特開2009-263830 )  

    発明者: 田村篤男、藤堂良、野村孝徳  出願人: 国立大学法人和歌山大学、帝人ファイバー株式会社

研究交流

  • ホログラフィックディスプレイ,コンピュータ合成ホログラムに関する打ち合わせ

    2019年11月
     

    国際研究交流

  • 計算イメージングに関する研究打ち合わせ,ディジタルホログラフィに関する特別講演

    2019年09月
     

    国際研究交流

  • ディジタルホログラフィや強度輸送方程式を用いた位相計測に関する研究打ち合わせ

    2019年04月
     

    国際研究交流

  • 計算イメージングに関する研究打合せ,Computational ghost imaging using random amplitude modulationの特別講演

    2018年09月
     

    国際研究交流

  • 計算イメージングに関する研究打合せ,Computational imaging using random amplitude/phase modulationの特別講演

    2018年09月
     

    国際研究交流

  • 情報フォトニクスに関する研究打ち合わせ

    2018年05月
     

    国際研究交流

  • ホログラフィック顕微鏡に関する研究打合せ

    2018年04月
     

    国際研究交流

  • 2015年第62回応用物理学会春季学術講演会

    2016年03月
     
  • SPIE Optical Engineering + Applications 2015

    2015年08月
     
  • フォトニクス技術フォーラム平成27年度第1回光情報技術研究会

    2015年07月
     
  • 2015 International Conference on Optical Instrument and Technologies

    2015年05月
     
  • Fourth Japan-Korea Workshop on Digital Holography and Information Photonics

    2014年12月
     
  • 日本光学会(応用物理学会)年次学術講演会OPJ2014

    2014年11月
     
  • IWH2014

    2014年10月
     
  • 2014年秋季第75回応用物理学会学術講演会

    2014年09月
     
  • フォトニクス技術フォーラム平成25年度第4回光情報技術研究会

    2014年02月
     
  • 応用光学懇談会第146回講演会

    2014年01月
     
  • フォトニクス技術フォーラム平成25年度第3回光情報技術研究会

    2013年12月
     
  • 日本光学会(応用物理学会)年次学術講演会OPJ2013

    2013年11月
     
  • Third Korea-Japan Workshop on Digital Holography and Information Photonics

    2013年11月
     
  • 2013年秋季第74回応用物理学会学術講演会

    2013年09月
     
  • フォトニクス技術フォーラム平成25年度第2回光情報技術研究会

    2013年09月
     
  • SPIE Optical Engineering + Applications 2013

    2013年08月
     
  • ISOM2013

    2013年08月
     
  • CLEO-PR & OECC/PS 2013

    2013年07月
     
  • フォトニクス技術フォーラム平成25年度第1回光情報技術研究会

    2013年07月
     

▼全件表示

科学研究費

  • 設計された点像分布関数を用いたレンズレス定量複素振幅イメージング

    2023年04月
    -
    2026年03月
     

    基盤研究(C)  代表

  • ランダム位相変調によるインライン型光学系を用いた瞬時複素振幅情報取得法

    2018年04月
    -
    2021年03月
     

    基盤研究(C)  代表

  • 単一露光一般化並列位相シフト法を用いた多次元複素振幅情報取得に関する研究

    2014年04月
    -
    2017年03月
     

    基盤研究(C)  代表

  • 波面符号化並列位相シフト法による瞬時複素振幅情報取得に関する研究

    2011年04月
    -
    2014年03月
     

    基盤研究(C)  代表

  • ワンショット位相シフト法を用いた低コヒーレントディジタルホログラフィの開発

    2006年04月
    -
    2008年03月
     

    基盤研究(C)  代表

  • 光秘匿データ記録蓄積および圧縮伝送システムに関する研究

    2002年04月
    -
    2004年03月
     

    基盤研究(C)  代表

▼全件表示

公的資金(他省庁、省庁の外郭団体、地方自治体等)

  • 認証機能を有する光暗号化ホログラフィックメモリ

    2006年04月
    -
    2007年03月
     

    代表

財団・企業等からの寄附金、公募型研究助成等

  • システム工学部寄附金(財団法人旭硝子財団研究助成)

    2008年04月
    -
    2010年03月
     

    研究助成  代表

公開講座等の講師、学術雑誌等の査読、メディア出演等

  • 諮問委員会委員

    2024年01月04日
    -
    2024年03月31日

    独立行政法人国立高等専門学校機構和歌山工業高等専門学校

     詳細を見る

    「学協会、政府、自治体等の公的委員」以外の委員

    諮問委員会委員に就任し、意見をいただく。
    委員会は2月中の1日、14時から予定。
    (野村先生には別途日程照会を郵送)

  • 寄稿

    2023年11月10日
    -
    2023年12月21日

    日本工業出版株式会社

     詳細を見る

    寄稿

    月刊『光アライアンス』誌原稿依頼、入稿編集等

  • 諮問委員会委員

    2022年09月01日
    -
    2023年03月31日

    独立行政法人 国立高等専門学校機構 和歌山工業高等専門学校

     詳細を見る

    助言・指導

    諮問委員会委員に就任し、意見をいただく。
    (9月26日(月)~9月30日(金)のうちの1日、14時から予定)

  • フォトニクス技術フォーラム 副委員長

    2022年06月07日
    -
    2024年03月31日

    一般財団法人 大阪科学技術センター

     詳細を見る

    運営参加・支援

    フォトニクス技術フォーラムについてご指導・ご協力をお願いします。

  • 和歌山工業高等専門学校諮問委員会委員

    2021年11月01日
    -
    2022年03月31日

    和歌山工業高等専門学校

     詳細を見る

    「学協会、政府、自治体等の公的委員」以外の委員

    和歌山工業高等専門学校の令和3年度諮問委員会の委員として委員会にご出席いただき、学校運営全般に亘って、ご指導、ご助言をいただく業務。

  • 参与会参与

    2021年10月01日
    -
    2024年06月30日

    一般財団法人大阪科学技術センター

     詳細を見る

    助言・指導

    法人の科学技術の振興に関する諸事業を総合的かつ効果的に推進するために、参与会を構成し、この法人の運営に関し、助言指導いただく。

  • 令和3年度 評議員

    2021年07月27日

    関西工業教育協会

     詳細を見る

    「学協会、政府、自治体等の公的委員」以外の委員

    関西工業教育協会令和3年度第1回評議員会において書面審議いただく。

  • OSA MNIT Student Chapter webinar講演

    2020年07月20日

    国立マラヴィア工科大学(インド)

     詳細を見る

    応用光学,情報フォトニクス,計測技術

    位相計測技術に関するオンライン講演

  • メキシコ国立自治大学南行洋教授訪問対応

    2019年12月

    その他

     詳細を見る

    国際交流事業

    12/2から12/10まで和歌山大学に滞在された南教授の対応(授業見学のスケジューリング,交渉など).,相手国:メキシコ合衆国

  • 外国人研究者等の受入

    2019年04月

    インド工科大学

     詳細を見る

    外国人研究者等の受入

    外国人研究者等の受入,氏名:Nishchal Naveen

  • SPIE Visiting Lecturer

    2018年09月

    SPIE Student Chapter at Indian Institute of Space Science and Technology

     詳細を見る

    国際交流事業

    Visiting Lecturerとしての講演(Government Engineering College, Trivandrum),相手国:India

  • SPIE Visiting Lecturer

    2018年09月

    SPIE Student Chapter at Indian Institute of Space Science and Technology

     詳細を見る

    国際交流事業

    Visiting Lecturerとしての講演(Indian Institute of Space Science and Technology)および大学院生との学術交流,相手国:India

  • 編集査読委員

    2018年08月
    -
    継続中

    Optics and Lasers in Engineering査読

     詳細を見る

    学術雑誌等の編集委員・査読・審査員等

    編集査読委員等

  • 編集査読委員

    2018年07月
    -
    継続中

    Optical Review査読

     詳細を見る

    学術雑誌等の編集委員・査読・審査員等

    編集査読委員等

  • 編集査読委員

    2018年04月
    -
    継続中

    Optics Express査読

     詳細を見る

    学術雑誌等の編集委員・査読・審査員等

    編集査読委員等

  • 編集委員長,Editor in Chief

    2017年03月
    -
    2019年02月

    Optical Review, Optical Society of Japan

     詳細を見る

    学術雑誌等の編集委員・査読・審査員等

    編集委員長,Editor in Chief,任期:2年

  • 第89回わだい浪切サロン

    2017年01月

    不明

     詳細を見る

    公開講座・講演会の企画・講師等

    デジタルカメラのしくみ,日付:18日

  • 講師

    2016年10月
    -
    継続中

    関西大倉学園出張講義

     詳細を見る

    講演講師等

    講師

  • 関西大倉中学校・高等学校 高大連携講座「学問体感vol.12

    2016年10月

    その他

     詳細を見る

    小・中・高校生を対象とした学部体験入学・出張講座等

    ホログラフィ~光を使って立体像を表現~,日付:4

  • 副編集委員長

    2016年06月
    -
    2017年02月

    Optical Review(日本光学会英文誌)

     詳細を見る

    学術雑誌等の編集委員・査読・審査員等

    副編集委員長

  • 光科学及び光技術調査委員長

    2016年04月
    -
    2018年03月

    光学,日本光学会

     詳細を見る

    学術雑誌等の編集委員・査読・審査員等

    光科学及び光技術調査委員長,任期:2年

  • 編集委員

    2012年04月
    -
    2013年03月

    Optical Review

     詳細を見る

    学術雑誌等の編集委員・査読・審査員等

    編集委員,任期:継続中

  • Board of Editors

    2009年04月
    -
    継続中

    Optical Society of Korea

     詳細を見る

    学術雑誌等の編集委員・査読・審査員等

    Board of Editors,任期:継続中

  • 委員 レーザー学会の学術雑誌「レーザー研究」の企画・編集をおこなう.

    2006年04月
    -
    2011年03月

    レーザー研究編集委員

     詳細を見る

    学術雑誌等の編集委員・査読・審査員等

    委員 レーザー学会の学術雑誌「レーザー研究」の企画・編集をおこなう.,任期:2006.4~2011.3

  • 学術雑誌等の査読

    1995年04月
    -
    継続中

    OPTICA, SPIEほか

     詳細を見る

    情報フォトニク

    査読(年間10本以上)

▼全件表示

学協会、政府、自治体等の公的委員

  • 評議員

    2023年09月01日
    -
    2024年08月31日
     

    関西工学教育協会

     詳細を見る

    学協会、政府、自治体等の公的委員

    会長の諮問に答申する。

  • Program委員

    2022年04月
    -
    継続中
     

    International Symposium on Optical Memory

     詳細を見る

    学協会、政府、自治体等の公的委員

    シンポジウムに投稿された論文の査読,プログラムの設定,任期:3年

  • 評議員

    2021年09月01日
    -
    2022年08月31日
     

    関西工学教育協会

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    学協会、政府、自治体等の公的委員

    評議員

  • Program Chair

    2019年04月
    -
    2022年03月
     

    International Symposium on Optical Memory

     詳細を見る

    学協会、政府、自治体等の公的委員

    シンポジウムに投稿された論文の査読,プログラムの設定,任期:3年

  • Program Chair

    2018年04月
    -
    2019年04月
     

    Information Photonics 2019 (IP2019)

     詳細を見る

    学協会、政府、自治体等の公的委員

    講演会プログラムの作成,管理,任期:1年

  • Optical Review Editor in Chief

    2018年02月
    -
    2020年02月
     

    日本光学会

     詳細を見る

    学協会、政府、自治体等の公的委員

    日本光学会機関誌Optical Review 責任編集,任期:2年

  • general co-chair

    2017年10月
    -
    2018年03月
     

    The 7th Korea-Japan Workshop on Digital Holography and Information Photonics

     詳細を見る

    学協会、政府、自治体等の公的委員

    general co-chair,任期:1年

  • 理事他役員

    2017年04月
    -
    2021年03月31日
     

    The Optical Society of Japan

     詳細を見る

    学協会、政府、自治体等の公的委員

    OSJ – OSA Joint Symposia on Digital Photonics

  • Program Committee

    2017年01月
    -
    継続中
     

    Optical Instrument and Technology

     詳細を見る

    学協会、政府、自治体等の公的委員

    Optoelectronics Imaging/Spectroscopy and Signal Processing Technology

  • Program co-chair

    2016年04月
    -
    2019年03月
     

    International Symposium on Optical Memory

     詳細を見る

    学協会、政府、自治体等の公的委員

    シンポジウムに投稿された論文の査読,プログラムの設定,任期:3年

  • 光科学及び光技術調査委員長

    2016年04月
    -
    2018年03月
     

    日本光学会

     詳細を見る

    学協会、政府、自治体等の公的委員

    光科学及び光技術調査委員会の円滑な運営,任期:2年

  • 委員

    2016年04月
    -
    2018年03月
     

    フォトニクス技術フォーラム光情報技術研究会学識委員

     詳細を見る

    国や地方自治体、他大学・研究機関等での委員

    委員,任期:2016年4月-2018年3月

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    2014年03月
     

    日本光学会(応用物理学会)

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    学協会、政府、自治体等の公的委員

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    2012年08月
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    国や地方自治体、他大学・研究機関等での委員

    国や地方自治体、他大学・研究機関等での委員,任期:2012/08/01~2014/03/31

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    大阪府立佐野高等学校学校協議会委員

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    国や地方自治体、他大学・研究機関等での委員

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    2012年12月
     

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    日本光学会(応用物理学会)ディジタルオプティクス研究G

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    フォトニクス技術フォーラム光情報技術研究会

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    継続中
     

    SPIE Optics + Photonics Conference

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    2006年04月
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    日本光学会(応用物理学会)ボリュームホログラフィックメモリ技術研究G

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    2017年03月
     

    日本学術振興会 産学協力研究委員会 フォトニクス情報システム 第179委員会

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    2001年04月
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    2018年03月
     

    日本光学会(応用物理学会)情報フォトニクス研究G

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