Faculty Profiles - NOMURA Takanori

Published Papers - NOMURA Takanori

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Random sparse sampling and compressive sensing based reconstruction for computational optical scanning holography

Naru Yoneda, Masamitsu Sugimoto, Yusuke Saita, Osamu Matoba, Takanori Nomura

Applied Optics ( Optica Publishing Group ) 64 ( 7 ) B102 - B102 2025.02

Optical scanning holography (OSH) is one of the single-pixel imaging (SPI) techniques. Although OSH can obtain an incoherent hologram using a single-pixel detector, OSH needs a complicated optical setup to generate Fresnel zone patterns (FZPs). Computational OSH (COSH) has been proposed to overcome the complexity of OSH by using a spatial light modulator (SLM). However, the measurement time of COSH is restricted by the refresh rate of an SLM for changing FZPs. While the number of measurements can be reduced by applying compressive sensing in conventional OSH, the scanning trajectory of FZPs is limited to the spiral manner because of the requirement of sequential scanning using galvo mirrors. The spiral scanning trajectory induces undesired artifacts in reconstructed images under sparse sampling conditions. If holograms can be randomly subsampled, these undesired artifacts can be reduced. In this paper, under COSH’s configuration, random sparse sampling of a hologram is proposed to overcome the problem of the limited trajectory of FZPs by discretely displaying FZPs on an SLM. In addition, compressive sensing is applied to reconstruct an object image from a randomly sampled hologram. The feasibility of the proposed method is confirmed numerically and experimentally. The experimental results indicate that the proposed method can identify the object even when the hologram is randomly subsampled with a sampling rate of 5%.

Single-shot Compressive Hyperspectral Imaging Utilizing Both Positive and Negative Diffracted Waves

Yusuke Saita, Ryohei Takahashi, Takanori Nomura

Advanced Devices & Instrumentation ( American Association for the Advancement of Science (AAAS) ) 2025.01

Adaptive sampling strategy for Fourier single-pixel imaging

Hongjie Liu, Yuki Matsuda, Shujun Zheng, Yusuke Saita, Xiao Lin, Takanori Nomura, Xiaodi Tan

Optics Communications ( Elsevier BV ) 573 131027 - 131027 2024.12

Computational Optical Scanning Holography

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

Photonics ( MDPI AG ) 11 ( 4 ) 347 - 347 2024.04

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.

Orthogonal matrix of polarization combinations: concept and application to multichannel holographic recording

Shujun Zheng, Jiaren Tan, Hongjie Liu, Xiao Lin, Yusuke Saita, Takanori Nomura, Xiaodi Tan

Opto-Electronic Advances ( Opto-Electronic Advances ) 7 ( 10 ) 230180 - 230180 2024

Quantitative phase imaging based on motionless optical scanning holography

Naru Yoneda, Osamu Matoba, Yusuke Saita, Takanori Nomura （Part： Last author )

Optics Letters ( Optica Publishing Group ) 48 ( 20 ) 5273 - 5273 2023.10

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.

Polarization imaging by use of optical scanning holography

Naru Yoneda, Yusuke Saita, Takanori Nomura （Part： Last author )

Optical Review ( Springer Science and Business Media LLC ) 2022.11 [Refereed]

Common-path off-axis single-pixel holographic imaging

Naru Yoneda, Yusuke Saita, Takanori Nomura （Part： Last author )

Optics Express ( Optica Publishing Group ) 30 ( 11 ) 18134 - 18134 2022.05 [Refereed]

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

Yusuke Saita, Daiki Shimoyama, Ryohei Takahashi, Takanori Nomura （Part： Last author )

Applied Optics ( The Optical Society ) 61 ( 5 ) 1106 - 1106 2022.02 [Refereed]

[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 （Part： Last author )

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

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 2021.10 [Refereed] [Invited]

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

Naru Yoneda, Yusuke Saita, Takanori Nomura （Part： Last author )

Applied Physics Letters ( AIP Publishing ) 119 ( 16 ) 161101 - 161101 2021.10 [Refereed]

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 （Part： Last author )

Applied Optics ( The Optical Society ) 60 ( 28 ) 8802 - 8802 2021.10 [Refereed]

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 2021.09 [Refereed]

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

Naru Yoneda, Takahiro Sakai, Takanori Nomura （Part： Last author )

Applied Optics ( The Optical Society ) 60 ( 24 ) 7500 - 7501 2021.08 [Refereed]

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

Naru Yoneda, Teruyoshi Nobukawa, Toshiyuki Morimoto, Yusuke Saita, Takanori Nomura （Part： Last author )

Optics Letters ( The Optical Society ) 46 ( 12 ) 2920 - 2920 2021.06 [Refereed]

Pupil-modulation ghost phase imaging

Takafumi Ito, Koshi Komuro, Takanori Nomura （Part： Last author,　Corresponding author )

Applied Optics 60 ( 15 ) 4398 - 4403 2021.05 [Refereed]

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.

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 （Part： Last author )

Optics Express ( OPTICAL SOC AMER ) 29 ( 4 ) 4783 - 4801 2021.02 [Refereed]

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.

Spatially divided phase-shifting motionless optical scanning holography

Naru Yoneda, Yusuke Saita, Takanori Nomura （Part： Last author )

OSA Continuum ( OPTICAL SOC AMER ) 3 ( 12 ) 3523 - 3535 2020.12 [Refereed]

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.

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

Shota Sakamaki, Naru Yoneda, Takanori Nomura （Part： Last author,　Corresponding author )

APPLIED OPTICS ( OPTICAL SOC AMER ) 59 ( 22 ) 6612 - 6618 2020.08 [Refereed]

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

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