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Development of new lighting technology to enhance luminance contrast for older people to read better

Research Project

Project/Area Number 16K06608
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Architectural environment/Equipment
Research InstitutionUniversity of Fukui

Principal Investigator

Akashi Yukio  福井大学, 学術研究院工学系部門, 教授 (10456436)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywords輝度コントラスト / 明視性 / 順応輝度 / 高齢者 / ロービジョン / グレア / プロジェクションマッピング / 光幕 / 照明 / 視作業 / コントラスト感度 / 視覚の加齢変化 / 読み易さモデル / 文字寸法 / 照度 / 読み易さ / 視覚 / 弱視 / プロジェクター / マッピング / アルゴリズム / 視覚特性 / 水晶体 / 眼球内散乱光 / 明視3要素 / 照明要件
Outline of Final Research Achievements

Readability of letters printed on a paper is determined by the letter size, luminance contrast, and adaptation luminance. Current lighting standards recommend increasing adaptation luminance. However, the contrast sensitivity of the human eye deteriorates while light scatters in eyeballs increase with aging. Therefore, it is more important to increase luminance contrast than adaptation luminance for the elderly. Conventional lighting techniques have not been able to enhance luminance contrast. Therefore, we proposed to apply the projection mapping technology that superimposes the image according to the shape of the irradiation target object to improve the luminance contrast. We have developed a new method that enhances the luminance contrast between the characters and the background by increasing the luminance of the background white paper without illuminating the black letters.

Academic Significance and Societal Importance of the Research Achievements

本研究成果は、視対象とその背景とを別々に照明できる最新のプロジェクションマッピング(以降、PMと呼ぶ)技術と読み易さモデルを用いて、作業者に眩しさを感じさせないで視対象の輝度コントラストを向上する手段を提供し、個人差が大きい高齢者とロービジョン者の個人の視覚特性に応じて最適な視環境を提供するという独創性と新規性の高い特徴を有する。
科学的に効果が認知されていながら、これまで具現化手段が無かった知見をシステム工学の最新のPM技術を用いて実現することを特長とする。建築環境の構成要素として不可欠な照明器具に応用することにより、生活形態を変革し、持続可能な社会の構築に貢献する。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (9 results)

All 2019 2018 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results) Book (1 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Veiling Luminance Caused by a Peripheral Glare Source on Extra-Foveal Vision2018

    • Author(s)
      Terai Norifumi、Iwamoto Kazushi、Akashi Yukio
    • Journal Title

      Journal of Science and Technology in Lighting

      Volume: 41 Issue: 0 Pages: 195-202

    • DOI

      10.2150/jstl.IEIJ170000605

    • NAID

      130006555894

    • ISSN
      2432-3225, 2432-3233
    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 高齢者の視覚支援のための輝度コントラスト強調照明技術2019

    • Author(s)
      久野悠太 村上香織 明石行生
    • Organizer
      照明学会全国大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 高齢者のコントラスト感度に応じた文字の読み易さ2018

    • Author(s)
      久野悠太、明石行生、村上香織
    • Organizer
      照明学会全国大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Senescent changes in readability of letters with various sizes, luminance contrasts, and background luminances2018

    • Author(s)
      Murakami, K., Yuta, K., Akashi, Y., Aoki, T., Inatani, M.
    • Organizer
      Lux Pacifica 2018 in Tokyo
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] AGEING EFFECTS ON DISCOMFORT GLARE SENSATION AND THEIR MECHANISMS2017

    • Author(s)
      Yukio Akashi, Sayuri Kojima, Tomoe Aoki, Masaru Inatani
    • Organizer
      Proceedings of the CIE Midterm Meeting 2017
    • Place of Presentation
      Korea
    • Year and Date
      2017-10-21
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] AGEING EFFECTS ON DISCOMFORT GLARE SENSATION AND THEIR MECHANISMS2017

    • Author(s)
      Akashi, Y., Kojima, S., Aoki, T., Inatani, M.
    • Organizer
      Conference on "Smarter Lighting for Better Life" at the CIE Midterm Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Book] CIE 227:2017 Lighting for older people and people with visual impairment in buildings2017

    • Author(s)
      Akashi Y、Akizuki Y、Cobham M、Itoh N、Miller N. J、Schlangen L-J.M、van den Broek Cools J.H.F
    • Total Pages
      67
    • Publisher
      International Commission on Illumination
    • Related Report
      2017 Research-status Report
  • [Patent(Industrial Property Rights)] 照明装置、照明方法及び照明システム2019

    • Inventor(s)
      平成
    • Industrial Property Rights Holder
      平成
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-052179
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] 照明装置、照明方法および照明システム2019

    • Inventor(s)
      明石行生、久野悠太、村上香織、稲谷大
    • Industrial Property Rights Holder
      明石行生、久野悠太、村上香織、稲谷大
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-052179
    • Filing Date
      2019
    • Related Report
      2018 Research-status Report

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Published: 2016-04-21   Modified: 2022-12-28  

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