Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
Contact information
External link
OKABE Takahiro
Degree
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博士（情報理工学） ( 東京大学 )
Research Areas
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Informatics / Perceptual information processing
Committee Memberships
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情報処理学会 コンピュータビジョンとイメージメディア研究会 運営委員
2020.4 - 2024.3
Committee type：Academic society
Papers
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FluoNeRF: Fluorescent Novel-View Synthesis Under Novel Light Source Colors Reviewed
Lin Shi, Kengo Matsufuji, Ryo Kawahara, Takahiro Okabe
2025 IEEE/CVF Winter Conference on Applications of Computer Vision (WACV2025) 2032 - 2041 2025.2
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Separating Direct and Global Components from Novel Viewpoints Reviewed
Kengo Matsufuji, Lin Shi, Ryo Kawahara, Takahiro Okabe
2025 IEEE/CVF Winter Conference on Applications of Computer Vision (WACV2025) 1829 - 1838 2025.2
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Polarization as Texture: Microscale 3D Shape from Polarized Light Focus Reviewed
Ren Matsumoto, Takahiro Okabe, Ryo Kawahara
2025 IEEE/CVF Winter Conference on Applications of Computer Vision (WACV2025) 515 - 524 2025.2
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Estimating absorption coefficient from a single image via entropy minimization Reviewed
Junya Katahira, Ryo Kawahara, Takahiro Okabe
Proc. the 34th British Machine Vision Conference (BMVC2023), 2023.11
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Light Source Separation and Intrinsic Image Decomposition under AC Illumination Reviewed
Yusaku Yoshida, Ryo Kawahara, Takahiro Okabe
2023 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR2023) 5735 - 5743 2023.6
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Soma Kajiyama, Taihe Piao, Ryo Kawahara, Takahiro Okabe
2023 IEEE/CVF Winter Conference on Applications of Computer Vision (WACV2023) 2548 - 2557 2023.1
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One-Shot Polarization-Based Material Classification with Optimal Illumination Reviewed
Miho Kurachi, Ryo Kawahara, Takahiro Okabe
Proceedings of the 20th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications 738 - 745 2025.2
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Shape from Mirrored Polarimetric Light Field Reviewed
Shunsuke Nakagawa, Takahiro Okabe, Ryo Kawahara
Proceedings of the 20th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications 790 - 796 2025.2
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Attached Shadow Constrained Shape from Polarization Reviewed
Momoka Yoshida, Ryo Kawahara, Takahiro Okabe
Proceedings of the 20th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications 640 - 647 2025.2
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Manipulating Gloss of Real Objects Under Omnidirectional Lighting Reviewed
Yuki Miyoshi, Ryo Kawahara, Takahiro Okabe
Proceedings of the 20th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications 429 - 434 2025.2
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Learning Projection Patterns for Direct-Global Separation Reviewed
Takaoki Ueda, Ryo Kawahara, Takahiro Okabe
Proceedings of the 19th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISAPP2024) 599 - 606 2024.2
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Measuring spatially-varying PSFs of 3D translucent objects Reviewed
Yuki Ide, Ryo Kawahara, Takahiro Okabe
Proc. the 30th International Workshop on Frontiers of Computer Vision (IW-FCV2024) 2024.2
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Using Extended Light Sources for Relighting from a Small Number of Images Reviewed
Toshiki Hirao, Ryo Kawahara, Takahiro Okabe
Proceedings of the 19th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISAPP2024) 607 - 615 2024.2
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Polarimetric Underwater Stereo Reviewed
Ryo Kawahara, Meng-Yu Jennifer Kuo, Takahiro Okabe
Proc. the 22nd Scandinavian Conference on Image Analysis (SCIA2023), LNCS 13885 534 - 550 2023.4
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Event-Based Reflectance Separation Reviewed
Ryota Kunimasu, Ryo Kawahara, Takahiro Okabe
Proc. the 29th International Workshop on Frontiers of Computer Vision (IW-FCV2023) 2023.2
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BRDF Measurement with TDCRA Reviewed
Atsushi Kimura, Ryo Kawahara, Takahiro Okabe
Proc. the 29th International Workshop on Frontiers of Computer Vision (IW-FCV2023) 2023.2
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Spectral Absorption from Two-view Hyperspectral Images Reviewed
Kenta Kageyama, Ryo Kawahara, Takahiro Okabe
Proceedings of the 17th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications (VISAPP2022) 715 - 721 2022.2
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Online Illumination Planning for Shadow-Robust Photometric Stereo Reviewed
Hirochika Tanikawa, Ryo Kawahara, Takahiro Okabe
Proc. the 28th International Workshop on Frontiers of Computer Vision (IW-FCV2022) 2022.2
Books
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Computational Imaging for Scene Understanding: Transient, Spectral, and Polarimetric Analysis
Takuya Funatomi, Takahiro Okabe（ Role： Joint editor）
2024.5 （ ISBN:1789451507 ）
MISC
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イメージベーストレンダリングのそのとき
岡部孝弘
電子情報通信学会誌 106 ( 12 ) 1086 - 1090 2023.12
Research Projects
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Computational Illumination with High Degrees-of-Freedom Active Light Fields
Grant number：20H00612 2020.04 - 2025.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
岡部 孝弘, 天野 敏之, 宮崎 大輔, 松岡 諒
Grant amount：\44720000 （ Direct expense: \34400000 、 Indirect expense：\10320000 ）
本研究課題を構成するAからDの4つの柱，さらにA1からD1の7つの項目のうち，令和3年度は，前年度から継続のB1動的シーンの成分分離とC1表面粗さの推定に加えて，A1物体の幾何学的・光学的モデリング，B2動的シーンの形状復元，および，C2物体の幾何学的・光学的モデリングのための照明計画に取り組んだ．
A1の幾何学的・光学的モデリングでは，前処理として重要になる相互反射除去に取り組んだ．多波長・多方向光源下画像の低ランク性に基づいて，非負値行列因子分解とロバストPCAを組み合わせた相互反射除去手法を提案した．
B1の成分分離とB2の形状復元については，両方の基盤となる鏡面反射成分と拡散反射成分の分離に取り組んだ．鏡面反射成分と拡散反射成分のいずれもが部分偏光であることを仮定して，単一のカラー偏光画像から，色情報と偏光情報に基づいて反射成分を分離する手法を提案した．また，偏光イベントベースカメラを用いた成分分離手法も提案した．
C1の表面粗さ推定では，液晶ディスプレイ-偏光カメラシステムを用いた平面物体の表面粗さと鏡面反射率の推定に取り組んだ．ノイズの伝播解析に基づいて，少数画像からの表面粗さと鏡面反射率の推定を実現した．さらに，3次元物体への拡張を目指して，表面粗さと鏡面反射率に加えて法線を推定する手法も提案した．
C2の照明計画では，液晶ディスプレイ-偏光カメラシステムを用いた照度差ステレオに取り組んだ．光源方向の可視性と線形独立性を考慮することで，少数の画像からカゲ（影と陰の両方）と鏡面反射に頑健な法線推定を実現した．
その他に，関連技術・派生技術として，映り込み除去や光弾性法などの偏光解析の研究や吸収特性などに関するスペクトルイメージングの研究にも取り組んだ． -
Deep Lighting: Data-Driven Active Light Fields
Grant number：23H04357 2023.04 - 2025.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Transformative Research Areas (A)
岡部 孝弘
Authorship：Principal investigator
Grant amount：\7800000 （ Direct expense: \6000000 、 Indirect expense：\1800000 ）
Class subject in charge
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3-D Image Processing （2024academic year） Fourth semester - 火1～2,木5～6
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Seminar in Pattern Information Processing （2024academic year） Year-round - その他
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Artificial Intelligence （2024academic year） 1st semester - 火3～4,金5～6
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Artificial Intelligence （2024academic year） 1st semester - 火3～4,金5～6
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Basic of Information Technology （2024academic year） 3rd and 4th semester - その他
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Engineering English （2024academic year） Late - その他
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Image Media Processing （2024academic year） Fourth semester - 木1～2
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Image Media Processing （2024academic year） Fourth semester - 木1～2
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Advanced Study （2024academic year） Other - その他
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Image Processing （2024academic year） Fourth semester - 火1～2,木5～6
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Image Processing （2024academic year） Fourth semester - 火1～2,木5～6
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Fundamental Image Processing （2024academic year） Fourth semester - 火1～2,木5～6
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Image Information Processing （2024academic year） Prophase - 水3～4
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Image Information Processing （2024academic year） Prophase - 水3～4
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Intelligent Image Information Processing （2024academic year） Late - その他
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Technical Writing 1 （2024academic year） Prophase - その他
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Technical Writing 2 （2024academic year） Late - その他