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Establishment of a method for measuring optical reflection characteristics on curved surfaces and its application to cultural heritage archives

Research Project

Project/Area Number 21K11954
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 61010:Perceptual information processing-related
Research InstitutionTokyo Polytechnic University (2022-2023)
Chiba University (2021)

Principal Investigator

Inoue Shinichi  東京工芸大学, 工学部, 客員研究員 (70743813)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsBRDF / 光反射特性 / 曲面 / 光沢 / 光沢ムラ / 質感 / 測定 / 文化財アーカイブ
Outline of Research at the Start

本研究では,曲面においても光反射特性が計測可能な新たな計測手法の確立と,その文化財アーカイブへの応用を目的としている.光沢の特性を双方向反射率分布関数(bidirectional reflectance distribution function, BRDF)として計測する価値は高いが,曲面における光反射特性(BRDF)の計測は課題であった.これまで進めてきた光反射特性のオリジナル計測手法をさらに展開することで,光の反射角分布に加え,曲面の形状を同時に計測できる新しい技術への展開を図る.これに基づき,曲面における光反射特性(BRDF)計測手法の確立とその文化財アーカイブへの応用を目指す.

Outline of Final Research Achievements

We developed a new measurement technology for physical light reflection characteristics (BRDF, gloss unevenness), which affects gloss, which affects texture. As a result, we developed a BRDF measurement technique for curved surfaces that was difficult to measure conventionally by considering this as a reflection of a paraboloid, and using condensed lighting. Additionally, in order to analyze the phenomenon in which gloss unevenness appears differently depending on the angle of light, we have developed a variable angle gloss unevenness measurement technology with high angular resolution. We proceeded to develop a prototype of these as measuring devices. New light reflection characteristics (BRDF, gloss unevenness) can now be measured numerically. The relationship between these BRDFs, gloss unevenness, and perception was analyzed through experiments. We considered using it for cultural property archives and CG.

Academic Significance and Societal Importance of the Research Achievements

光沢は人間の知覚である質感に大きな影響を与える.このため光沢は重要な品質特性として産業界で広く計測評価されてきた.本研究により,新たに曲面のBRDF 計測技術が開発されたこと,角度分解能の高い変角光沢ムラ計測技術が開発されたことは,産業界においては品質管理,製品開発において従来は人間に頼っていた評価を数値化できる可能性がある.さらに,仏像のような光沢を有する文化財の光反射特性をアーカイブとして残すことが可能となる.学術的には,人間が素材に対する高級感のように,従来解析する上で計測できなかった光沢についての新たな情報が数値化できるようになる.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (15 results)

All 2024 2023 2022 2021

All Journal Article (4 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (9 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Measuring Method for Gloss Unevenness with Three Directional Lights2023

    • Author(s)
      Inoue Shinichi、Igarashi Yoshinori、Hoshi Takeyuki、Satoh Toshifumi
    • Journal Title

      London Imaging Meeting

      Volume: 4 Issue: 1 Pages: 25-29

    • DOI

      10.2352/lim.2023.4.1.07

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of light source distances and illuminances on the gloss perception of papers2022

    • Author(s)
      Zhu Xiaoyi、Inoue Shinichi、Sato Hiromi、Mizokami Yoko
    • Journal Title

      Journal of the Optical Society of America A

      Volume: 39 Issue: 6 Pages: B28-B28

    • DOI

      10.1364/josaa.450094

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Measuring BRDF for curved surfaces based on parabolic reflection2022

    • Author(s)
      Inoue Shinichi、Igarashi Yoshinori、Hoshi Takeyuki、Tsumura Norimichi
    • Journal Title

      Optics Continuum

      Volume: 1 Issue: 8 Pages: 1637-1637

    • DOI

      10.1364/optcon.453077

    • Related Report
      2022 Research-status Report
  • [Journal Article] EFFECT OF LIGHT SOURCE DISTANCE ON THE DISCRIMINATION AND GLOSS PERCEPTION OF PAPER2021

    • Author(s)
      X.Y. Zhu , S. Inoue , H. Sato , Y. Mizokami
    • Journal Title

      International Commission on Illumination, CIE

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] 光沢ムラ画像の識別における入射光角度条件の影響2024

    • Author(s)
      中村颯 , 井上信一 , 佐藤弘美 , 溝上陽子
    • Organizer
      日本視覚学会 2024年冬季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Study of Classification of Coated Paper Brands Using Gloss Images by Contrastive Learning2024

    • Author(s)
      Takechiyo Kaai;Noriko Yata;Yoshitsugu Manabe;Shinichi Inoue
    • Organizer
      IWAIT 2024
    • Related Report
      2023 Annual Research Report
  • [Presentation] 3方向同時照明によるワンショット光沢ムラ測定2023

    • Author(s)
      五十嵐美範 , 井上信一 , 佐藤利文
    • Organizer
      Optics & Photonics Japan(OPJ)
    • Related Report
      2023 Annual Research Report
  • [Presentation] 光沢ムラ測定による魔鏡の解析2023

    • Author(s)
      井上信一 , 五十嵐美範 , 機株式会 , 佐藤利文
    • Organizer
      日本文化財科学会第40回記念大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 光沢情報が紙の判別と印象に与える影響2022

    • Author(s)
      中村颯 , 井上信一 , 佐藤弘美 , 溝上陽子
    • Organizer
      日本視覚学会 2022年夏季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] テレセントリック光学系を用いた金の光沢ムラ測定2022

    • Author(s)
      井上信一, 中村颯, 五十嵐美範, 星武幸, 佐藤弘美, 溝上陽子
    • Organizer
      日本文化財科学会第39回大会 2022年9月11日
    • Related Report
      2022 Research-status Report
  • [Presentation] Measurement of Gloss Unevenness with Different Reflection Angles2022

    • Author(s)
      So Nakamura;Shinichi Inoue;Yoshinori Igarashi;Takeyuki Hoshi;Hiromi Sato;Yoko Mizokami
    • Organizer
      Color and Imaging Conference (CIC 30)
    • Related Report
      2022 Research-status Report
  • [Presentation] 視覚に近い光沢ムラの測定と表示方法2022

    • Author(s)
      井上信一 , 五十嵐美範 , 星武幸 , 矢田紀子 , 溝上陽子
    • Organizer
      情報処理学会年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 球体のBRDF測定技術2021

    • Author(s)
      井上信一 , 五 十嵐美範 , 星武幸 , 津村徳道
    • Organizer
      日本光学会年次学術講演会
    • Related Report
      2021 Research-status Report
  • [Patent(Industrial Property Rights)] 反射光分布測定装置及び方法2022

    • Inventor(s)
      井上信一 , 五十嵐美範 , 星武幸 , 津村徳道
    • Industrial Property Rights Holder
      井上信一 , 五十嵐美範 , 星武幸 , 津村徳道
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2022-024612
    • Filing Date
      2022
    • Related Report
      2021 Research-status Report
  • [Patent(Industrial Property Rights)] 反射光分布測定装置及び方法2021

    • Inventor(s)
      井上信一 , 五十嵐美範 , 星武幸 , 津村徳道
    • Industrial Property Rights Holder
      井上信一 , 五十嵐美範 , 星武幸 , 津村徳道
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2021-139043
    • Filing Date
      2021
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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