研究者詳細 - 天野　敏之

論文 - 天野　敏之

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AN ITERATIVE CONVERGENCE ALGORITHM FOR SINGLE/MULTI GROUND PLANE DETECTION AND ANGLE ESTIMATION WITH RGB-D CAMERA

Yankun Lang, Haiyuan Wu, Toshiyuki Amano, Qian Chen

2015 IEEE INTERNATIONAL CONFERENCE ON IMAGE PROCESSING (ICIP) ( IEEE ) 2895 - 2899 2015年 [査読有り]

In this paper, we propose an innovative algorithm for detecting single or multiple ground planes and estimating the orientation of the ground plane with a RGB-D camera. In our algorithm, we use Kernel Density Estimator for selecting the ground plane reliably under a given tilt angle. Camera tilt angle is estimated with probability theory and then used as a feedback to improve the accuracy of detection. Our algorithm is evaluated on several challenging data set and is shown to hold great superiority and effectiveness.

DOI

AN ITERATIVE CONVERGENCE ALGORITHM FOR SINGLE/MULTI GROUND PLANE DETECTION AND ANGLE ESTIMATION WITH RGB-D CAMERA

Yankun Lang, Haiyuan Wu, Toshiyuki Amano, Qian Chen

2015 IEEE INTERNATIONAL CONFERENCE ON IMAGE PROCESSING (ICIP) ( IEEE ) 2895 - 2899 2015年 [査読有り]

DOI

質感プロジェクションマッピング

天野敏之

日本バーチャルリアリティ学会誌 19 ( 2 ) 78-81,66(1) - J533 2014年06月 [招待有り]

プロジェクションディスプレイ技術を応用した質感操作技術は,テーマパークや美術館での演出，プロダクトデザイン補助，さらには宝飾品のライトアップなど，様々な応用が期待できる．しかし,既存のプロジェクションディスプレイ技術による質感操作は，投影対象のモデルが必要であるうえに投影像の位置合わせも必要であり，利用者には多大な手間が要求される．そこで，本論文では認知科学により得られた知見に基づく画像処理アルゴリズムを提案し，Fujiiらが提案している投影中心が一致したプロジェクタ・カメラ系と筆者らが提案している見かけの操作技術へ実装することで透明感と光沢感を光投影によって連続的に操作する方法を提案する．実験では，陶器やプラスチック，シルクへの適用結果を示し，提案手法の有効性を考察する．さらに，本論文ではプロジェクションディスプレイ技術を応用した質感操作の限界について述べる．

DOI

プロジェクタカメラ系を用いた光沢感と透明感の実時間操作

天野敏之

映像情報メディア学会誌(Web) ( 一般社団法人映像情報メディア学会 ) 68 ( 12 ) J528-J533 (J-STAGE) - J533 2014年01月 [査読有り]

DOI

Successive Wide Viewing Angle Appearance Manipulation with Dual Projector Camera Systems.

Toshiyuki Amano, Isao Shimana, Shun Ushida, Kunioki Kono

International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments, ICAT-EGVE 2014, Bremen, Germany, December, 8-10, 2014. ( Eurographics Association ) 49 - 54 2014年 [査読有り]

DOI

Projection Center Calibration for a Co-located Projector Camera System

Toshiyuki Amano

2014 IEEE CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION WORKSHOPS (CVPRW) ( IEEE ) 449 - 454 2014年 [査読有り]

A co-located projector camera system where the projector and camera are positioned in the same optical position by a plate beam splitter enables various spatial augmented reality applications for dynamic three dimensional scenes. The extremely precise alignment of the projection centers of the camera and projector is necessary for these applications. However, the conventional calibration procedure for a camera and projector cannot achieve high accuracy because an iterative verification process for the alignment is not included. This paper proposes a novel interactive alignment approach that displays a capture of the projected grid pattern on the calibration screen. Additionally, a misalignment display technique that employs projector camera feedback is proposed for fine adjustment.

DOI

プロジェクタカメラ系による印刷媒体での新たな立体提示

天野敏之

電子情報通信学会論文誌. D, 情報・システム = The IEICE transactions on information and systems (Japanese edition) ( 一般社団法人電子情報通信学会 ) 96 ( 8 ) 1865 - 1873 2013年08月 [査読有り]

本論文は,プロジェクタカメラ系を用いた印刷媒体での新たな立体提示手法を提案する.提案手法は,符号化印刷と見かけの制御の二つのコア技術より構成される.符号化印刷ではHSV色空間にで定義される法線マップ画像により形状を色彩で表現し,3Dコンテンツの立体情報をカラー印刷によって印刷媒体へ埋め込む.また,プロジェクタカメラ系は印刷媒体のキャプチャ画像から印刷媒体に埋め込まれた立体情報を復元する.その後,3Dコンテンツに応じた陰影アニメーションを見かけの制御により印刷媒体上に提示し,ユーザに立体知覚を促す.ユーザスタディによる提案手法の評価では,提案手法による陰影アニメーションは静止した陰影提示よりも1%有意水準において立体提示手法とし有意であることが確認された.

プロジェクタカメラシステムへの誘い

天野敏之

電子情報通信学会誌 : The Journal of the Institute of Electronics, Information and Communication Engineers ( 一般社団法人電子情報通信学会 ) 96 ( 6 ) 435 - 440 2013年06月 [招待有り]

プロジェクタは映像をスクリーンへ表示するための単なるディスプレイ装置ではなく,光学的に現実世界へ働き掛けることを可能にする出力装置と考えることもできる.また,カメラによる実環境のセンシングを加えたプロジェクタカメラシステムでは,一方的に映像を提示するだけではなく,日常生活環境に応じてひずみのない鮮やかな映像を投影したり,物体の見かけを操作することも可能となる.本稿は工学の基礎を習得し,これからプロジェクタカメラシステムの研究に取り組む初学者が読むことを想定し,基礎技術として幾何学レジストレーション,光学補償,光輸送について解説する.

A model-based tracking framework for textureless 3D rigid curved objects

Marina Oikawa, Takafumi Taketomi, Goshiro Yamamoto, Makoto Fujisawa, Toshiyuki Amano, Jun Miyazaki, Hirokazu Kato

SBC Journal on 3D Interactive Systems, Special Issue of the XIV Symposium on Virtual and Augmented Reality 3 ( 2 ) 2 - 15 2013年01月 [査読有り]

Projection Based Real-time Material Appearance Manipulation

Toshiyuki Amano

2013 IEEE CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION WORKSHOPS (CVPRW) ( IEEE ) 918 - 923 2013年 [査読有り]

We introduce a new projection display technique that converts a visual material appearance of target object. Unlike conventional projection display, our approach allowed us successive material appearance manipulation by the projector camera feedback without scene modeling. First, we introduce an appearance control framework with a coaxial projector camera system. Next, we introduce two image based material appearance manipulation methods of translucency and glossiness. Last, we verify the ability of the material appearance manipulation of the proposed display technique through the experiments.

DOI

粒子法とウェーブレットを用いたサブパーティクルスケール乱流の高速なシミュレーション

藤澤誠, 三村豪, 天野敏之, 宮崎純, 加藤博一

情報処理学会論文誌ジャーナル(CD-ROM) 53 ( 7 ) 1915 - 1923 2012年07月 [査読有り]

本論文ではパーティクル法とウェーブレット解析を用いた高速な乱流シミュレーション手法を提案する．高速に流体の流れを再現するためにパーティクル法の一種であるSPHを用い，そのパーティクル間の相互関係から直接ウェーブレット解析により乱流が発生する領域を検出する方法を提案する．検出された領域にウェーブレットノイズに基づき渦場を付加することで乱流を再現する．さらに，乱流エネルギーに基づきパーティクルを分割・回転させることで，サブパーティクルスケールでの乱流を実現する．最後にこれらの処理のほとんどはGPU上で容易に実装可能であり，リアルタイムに近い速度で実行できることを示す．This paper presents a fast simulation method for turbulent flow which uses a particle method and wavelet analysis. To simulate fluid flow, the method uses smoothed particle hydrodynamics (SPH), which discretizes the fluid into a collection of particles, and detects regions where turbulent flow will occur by using wavelet analysis without a spatial grid. By taking the curl of wavelet noise, the turbulent flow is then appended as a divergence-free turbulence velocity field. Additionally, by using a particle splitting, which characterize the vortex features of turbulence, a sub-particle-scale representation of turbulent flow is proposed. Implementing almost all processes on a graphics processing unit (GPU), simulations are performed in near real time.

DOI

Meetsu: Augmented Reality Co-located Meeting Support System

Igor de Souza Almeida, Jun Miyazaki, Goshiro Yamamoto, Makoto Fujisawa, Toshiyuki Amano, Hirokazu Kato

The 5th Korea-Japan Workshop on Mixed Reality (KJMR2012) 2012年04月

Interactive photomosaic system using GPU

Makoto Fujisawa, Toshiyuki Amano, Takafumi Taketomi, Goshiro Yamamoto, Yuki Uranishi, Jun Miyazaki

MM 2012 - Proceedings of the 20th ACM International Conference on Multimedia ( ACM ) 1297 - 1298 2012年 [査読有り]

DOI

Local quadrics surface approximation for real-time tracking of textureless 3D rigid curved objects

Marina Atsumi Oikawa, Takafumi Taketomi, Goshiro Yamamoto, Makoto Fujisawa, Toshiyuki Amano, Jun Miyazaki, Hirokazu Kato

Proceedings - 2012 14th Symposium on Virtual and Augmented Reality, SVR 2012 ( IEEE Computer Society ) 246 - 253 2012年 [査読有り]

This paper addresses the problem of tracking textureless rigid curved objects. A common approach uses polygonal meshes to represent curved objects and use them inside an edge-based tracking system. However, in order to accurately recover their shape, high quality meshes are required, creating a trade-off between computational efficiency and tracking accuracy. To solve this issue, we suggest the use of quadrics for each patch in the mesh to give local approximations of the object shape. The novelty of our research lies in using curves that represent the quadrics projection in the current viewpoint for distance evaluation instead of using the standard method which compares edges from mesh and detected edges in the video image. This representation allows to considerably reduce the level of detail of the polygonal mesh and led us to the development of a novel method for evaluating the distance between projected and detected features. The experiments results show the comparison between our approach and the traditional method using sparse and dense meshes. They are presented using both synthetic and real image data. © 2012 IEEE.

DOI

Shading illusion: A novel way for 3-D representation on paper media

Toshiyuki Amano

IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops ( IEEE Computer Society ) 1 - 6 2012年 [査読有り]

Content printed on the paper media is not rewritable, but its appearances can be controlled by illumination. In this paper, we propose a new method to represent three-dimensional (3-D) shape on the print media by the shading animation using projector-camera feedback. The proposed method consists of a hue, saturation, and value (HSV) map and an appearance control technique, and these are key technologies. The HSV map represents a normal map of the 3-D content, and it is embedded in the printed media by full color print. While the system is projecting a shading animation for the 3-D representation, the embedded information is decoded by modulation estimation using the appearance control technique. © 2012 IEEE.

DOI

Appearance Control for Human Material Perception Manipulation

Toshiyuki Amano, Kenichi Komura, Takashi Sasabuchi, Shota Nakano, Shunya Yamashita

2012 21ST INTERNATIONAL CONFERENCE ON PATTERN RECOGNITION (ICPR 2012) ( IEEE ) 13 - 16 2012年 [査読有り]

We describe a new concept of human visual perception manipulation using illumination projection. The idea is to alternate material appearance of an object using projector camera feedback and a manipulation technique of an image-based material appearance. Unlike the simple display technique, our approach can manipulate human material perception for any object using the appearance control technique in real time without scene modeling. The experimental results show the ability of manipulating both human translucent perception and gloss perception.

プロジェクタカメラフィードバックのためのアンチベイヤ投影法

天野敏之

日本バーチャルリアリティ学会論文誌 ( 特定非営利活動法人日本バーチャルリアリティ学会 ) 16 ( 4 ) 653 - 662 2011年12月 [査読有り]

In this paper, the problem of the over-projection when we use the Bayer imaging for the drastic appearance control by the projector camera feedback is denoted and the mechanism of how it arise is explained. As a solution for this problem, a simple approach of anti-Bayer projection which restricts over-projection caused by Bayer imaging is proposed. The computational simulations and experimental results which employed Bayer camera show the effectiveness of anti-Bayer projection for the drastic appearance control by the projector camera feedback.

DOI

AR based Co-located Meeting Support System

Igor de Souza Almeida, Jun Miyazaki, Goshiro Yamamoto, Makoto Fujisawa, Toshiyuki Amano, Hirokazu Kato

In Proceedings of The 21st International Conference on Artificial Reality and Telexistence (ICAT2011) 146 - 146 2011年11月 [査読有り]

Model Based Tracking of Rigid Curved Objects using Sparse Polygonal Meshes

Marina Atsumi Oikawa, Goshiro Yamamoto, Makoto Fujisawa, Toshiyuki Amano, Jun Miyazaki, Hirokazu Kato

In Proceedings of The 21st International Conference on Artificial Reality and Telexistence (ICAT2011) 145 - 145 2011年11月 [査読有り]

Quantitative Evaluation Method for Model-based Tracking of 3D Rigid Curved Objects

Marina Atsumi Oikawa, Goshiro Yamamoto, Makoto Fujisawa, Toshiyuki Amano, Jun Miyazaki, Hirokazu Kato

Proc. of the 2nd International Workshop on AR/MR Registration, Tracking and Benchmarking 2011年10月 [査読有り]

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