KATAYAMA Ichiro

    Department of Human Factors Engineering and Environmental Design Professor
Last Updated :2024/03/24

Researcher Information

Research funding number

  • 70369916

J-Global ID

Research Interests

  • 照明   色彩   color science   

Research Areas

  • Nanotechnology/Materials / Optical engineering and photonics

Association Memberships

  • 日本照明委員会   Optical Society of America   JAPAN ERGONOMICS SOCIETY   JAPAN SOCIETY OF KANSEI ENGINEERING   日本建築学会   日本インテリア学会   日本光学会   日本色彩学会   照明学会   

Published Papers

  • Effects of angular distances between colour stimuli on colour conspicuity
    Rumiko Takata; Ichiro Katayama
    Journal of the International Colour Association 34 1 - 11 2023/12 [Refereed]
  • 繰り返し発令された緊急事態宣言解除直後の公共空間における利用者の停留・滞留行動-JR大阪駅アトリウム広場を対象として-
    船曵悦子; 片山一郎
    日本建築学会技術報告集 29 (71) 352 - 356 2023/02 [Refereed]
  • Application of colour feelings prediction formulas to the estimation of two-colour combination feelings of “Kimono”
    Ichiro Katayama; Sachiko Noguchi; Rumiko Takata; Kaori Segawa
    Journal of the International Colour Association 29 11 - 21 2022/03 [Refereed][Invited]
  • 「新しい生活様式」が公共空間の利用者の停留・滞留行動に与える影響 − JR大阪駅アトリウム広場を対象として−
    船曵悦子; 片山一郎
    日本建築学会技術報告集 27 (67) 1379 - 1383 2021/10 [Refereed]
  • 昼光模擬光源とハイパースペクトルカメラを用いて測定した口腔内の歯冠の分光放射輝度率
    片山一郎
    歯科の色彩 27 (1) 3 - 10 2021/03 [Refereed]
  • 2006年と2016年に実施したアンケート結果に見る市庁舎の市民空間の利用に関する変化
    船曵悦子; 片山一郎; 松本直司
    日本建築学会計画系論文集 84 (765) 2259 - 2269 2019/11 [Refereed]
  • 日本人大学生が自己の歯冠色に対して抱く心的イメージと生活習慣との関係
    片山一郎
    歯科の色彩 25 (1) 4 - 16 2019/05 [Refereed]
  • Performance Comparison of Various Whiteness Formulas Based on Visual Evaluation Experiments
    Ichiro Katayama
    Journal of Science and Technology in Lighting 43 7 - 17 2019 [Refereed]
     
    The Technical Committee TC 1-95 established in the International Commission on Illumination (CIE) is currently active in improving the CIE whiteness formula to extend the scope of the applicability of lighting conditions other than the standard illuminant D65. However, it is important to examine whether or not the CIE whiteness formula is significantly superior to other whiteness formulas under the standard illuminant D65. In this study, we conducted comparisons of the predictive performance of 19 whiteness formulas, including the CIE whiteness formula. These comparisons were based on the results of nine visual evaluation experiments that were conducted by four research groups. The results of the analysis clearly demonstrated that, compared to the CIE whiteness formula, the Uchida and Grum whiteness formulas had better outcomes. The predictive performance of the CIE whiteness formula was ranked 11th among the 19 whiteness formulas. This low predictive performance is due to the structure of the CIE whiteness formula, which does not have a penalty term. We also found that the structure of the Grum whiteness formula was simpler and had better predictive performance than the Uchida whiteness formula. Thus, we conclude that the Grum whiteness formula is superior to the Uchida whiteness formula.
  • Formulation to Inspect Qualities of Pyrolyzed Wood Pellets using CIELAB Color Parameters
    Toru Sawai; Ichiro Katayama; Tamio Ida
    Advanced Experimental Mechanics 3 65 - 71 2018/08 [Refereed]
  • 位置情報を活用したゲームアプリが公共空間の利用者の行動に与える影響 -JR札幌駅西コンコースを対象として-
    船曵悦子; 片山一郎; 松本直司
    日本インテリア学会論文報告集 28 63 - 70 2018/03 [Refereed]
  • 色彩感情予測式を用いたビジネスホテルの客室壁面に見る2色配色の定量的分析
    片山一郎; 船曵悦子
    日本インテリア学会論文報告集 28 21 - 27 2018/03 [Refereed]
  • Improvement of color feelings prediction formulas to evaluate interior color combinations
    Ichiro Katayama; Etsuko Funabiki; Sumio Yano
    AIDIA Journal 17 86 - 93 2017/11 [Refereed]
  • Ichiro Katayama; Kimio Matsumoto; Kenta Noda; Noboru Kawanishi
    Journal of the Illuminating Engineering Institute of Japan (Shomei Gakkai Shi) The Illuminating Engineering Institute of Japan 101 (2) 75 - 81 1349-838X 2017/02 [Refereed]
     
    An index for quantitative evaluation of the color discrimination property of sunglass lenses was calculated as the ratio of the color gamut area formed by the eight CIE-1974 test-color samples for the general color rendering index on the CIECAM02 colorfulness plane under the standard illuminant D65 after passing through the sunglass lenses under test to the gamut area formed by the samples on the plane under the illuminant D65. The index was validated by a very high simple correlation coefficient between the visual evaluation results and the indices of the color discrimination property. Furthermore, it was shown that blocking the spectral component around 565 nm effectively improves the color discrimination property and that a spectral transmittance factor that blocks wavelength components in a 500-nm area effectively improves color discrimination and enhances colorfulness for the color yellow simultaneously.
  • 本津 茂樹; 平井 瑞樹; 片山 一郎; 山本 衛; 加藤 暢宏; 吉川 一志
    Journal of bio-integration バイオインテグレーション学会 7 (1) 39 - 43 2186-2923 2017 [Refereed]
  • Toru Sawai; Ichiro Katayama; Tamio Ida; Hiroki Imamura; Takeshi Kajimoto
    Mechanical Engineering Journal The Japan Society of Mechanical Engineers 4 (1) 16 - 00320-16-00320 2017/01 [Refereed]
     

    Noticing the color variation of torrefied woody biomass with pyrolysis process, a non-invasive method to estimate energy properties such as elemental contents, higher heating value and energy yield is investigated. When the torrefied biofuel is produced and utilized, the quality control concerning energy properties is indispensable. The energy properties of torrefied woody biomass are correlated with its mass yield, and the relationship between mass yields and colorimetric values defined by CIELAB is experimentally examined. The results obtained for torrefied Japanese cedar are as follows. (1) The energy properties of torrefied Japanese cedar are expressed by simple relations of mass yield. The optimum torrefaction condition to produce torrefied biofuel can be evaluated by the mass yield. (2) To estimate the mass yield of torrefied Japanese cedar, the experimental correlations with colorimetric values are proposed. In the case of the sap-wood and heart-wood samples for brightness, L* above 45, the mass yield is correlated with L*, and in the case of the sap-wood, heart-wood and bark samples for L* below 45, the mass yield is correlated with color coordinate, a*. From the comparison between predicted mass yields and experimental data, it is found that the proposed experimental correlations can estimate the mass yield within an accuracy of ±10%. Therefore, the energy properties of torrefied Japanese cedar is easy to be checked by using the present non-invasive estimation method with colorimetric values.

  • Comparison of optimal illuminance and correlated color temperature for various daily-life activities -Experiment using LED lighting equipment that can adjust illuminance and correlated color temperature-
    KATAYAMA Ichiro
    AIDIA Journal 14 89 - 99 2014/11 [Refereed]
  • 船曵悦子; 松本直司; 片山一郎
    日本インテリア学会論文報告集 日本インテリア学会 23 (23) 61 - 66 1882-4471 2013/03 [Refereed]
  • Application of Color Feelings Prediction Formulae for Evaluation of Interior Coloration
    Ichiro Katayama; tsuko Funabiki; Sumio Yano
    AIDIA Journal 11 106 - 112 2011/11 [Refereed]
  • Katayama Ichiro; Uchida Hiroko; Sobagaki Hiroaki; Baba Gorow
    Journal of the Color Science Association of Japan 日本色彩学会 35 (1) 2 - 9 0389-9357 2011/03 [Refereed]
     
    Although studies on whiteness have been done in various countries, many of them are experiments using their own sample sets and methods in their own regions. Even if the same white sample set is used, it is possible that differences in culture and environment in lives of the observers influence the experimental results. Accordingly, we have carried out visual evaluation experiment on whiteness using the same sample set in three places including outside of Japan, and compared the observers living in different spheres of culture. For the experiment, 18 kinds of white samples are used, and the ranking method is adopted for the visual evaluation. As a result, the analysis has clarified that, although tendency of whiteness evaluation by the observers can be broadly classified into three or four types, there exists no clear relationship between the evaluation types and attributes of the observers, in every place of experiment. In addition, the percentages of each evaluation type show no statistically significant differences among the places of experiment, and the average results of whiteness evaluation show high correlation among the places of the experiment. Thus it has been clarified that differences in internal criteria in evaluating whiteness are found among the observers although they are not caused by the differences in cultural backgrounds of the observers. While correlation is high between the CIE whiteness index and the average results of whiteness evaluation by all the observers, its correlation with the Uchida whiteness index, which takes into account how red and green tint colors influence whiteness perception, is higher.
  • Ichiro Katayama; Mark D. Fairchild
    COLOR RESEARCH AND APPLICATION JOHN WILEY & SONS INC 35 (6) 410 - 418 0361-2317 2010/12 [Refereed]
     
    This article describes a new perceived whiteness index, C/V index, which focuses on the brightness-enhancement effect of color components included in the spectral reflectance factor distribution of approximate white objects or in the spectral power distribution of illuminations. The index is developed on the basis of a color vision model. The perceived whiteness of 18 approximate white samples was evaluated, and then a predictability of the index was compared with 17 types of existing whiteness indices. As a result, the C/V index was one of the indices indicating the best predicting performance. The aforementioned findings show that the C/V index is effective in evaluating the perceived whiteness of approximate white objects and the brightness-enhancement effect of color components is an important factor in determining the perceived whiteness. (C) 2009 Wiley Periodicals, Inc. Col Res Appl, 35, 410-418, 2010; Published online 10 November 2009 in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/col.20551
  • ISHI Hanae; KATAYAMA Ichiro; SUZUKI Yuri
    Transactions of Japan Society of Kansei Engineering Japan Society of Kansei Engineering 10 (1) 35 - 43 1884-0833 2010/12 [Refereed]
     
    Shadow letters refer to subjectively-perceived letters that lack actual contours, but have illusory contours acquired as a result of shading. This study aims to examine the colorimetric factors affecting the evaluation of impressions of chromatic shadow letters on the basis of the corresponding relationship between psychological evaluation and colorimetric values. In the impression rating experiment, twenty participants rated the impressions of - conspicuousness, legibility, and three dimensionality - of each letter string on a 7-point scale. It was inferred that the rating values increased when the participants observed differences in hues or tones between the colors of the shadow and background. Further, the colorimetric values of the stimuli between the colors of the shadow and background were evaluated based on the color measurement. An analysis of the correlation between the psychological rating values and the colorimetric values of the stimuli revealed that the impression strength of the shadow letter strings was largely dependent on the color difference.
  • Influence of Color Vision Characteristics on Categorical Color Perception to Self-luminous Color Stimuli
    KATAYAMA Ichiro
    AIDIA Journal 10 152 - 160 2010/11 [Refereed]
  • Influence of Illuminance and Chromaticity of Illuminant on Categorical Color Perception to Self-luminous Color Stimuli -Appearance of Small Self-luminous Color Stimuli in a Room-
    KATAYAMA Ichiro
    AIDIA Journal 10 143 - 151 2010/11 [Refereed]
  • Properties of Daylight Measured Indoors -A Comparison of North and South-facing Window Light-
    Ichiro Katayama; Tsutomu Aoki
    AIDIA Journal 9 142 - 147 2009/11 [Refereed]
  • KATAYAMA Ichiro; AOKI Tsutomu
    Transactions of Japan Society of Kansei Engineering Japan Society of Kansei Engineering 9 (1) 81 - 86 2009/11 [Refereed]
     
    To identify the characteristics of the two-color combinations called “Kasane-Irome” which are found in the noble attire of the Heian Period, we calculated their estimated values of the affection factors by using color affection prediction formulas and compared them with the values calculated for two-color combinations of 201 colors of Practical Color Co-ordinate System (PCCS). The result showed that in 120 types of “Kasane-Irome”, the average value of the “contrast” factor was lower and those of the “floridness” and “warmth” factors were higher as compared with the values of 20100 two-color combinations of PCCS 201 colors. However, there was no statistically significant difference found in the average value of the “pleasantness” factor that shows degree of good harmony. There was no statistically significant difference in the average values of the factors such as “pleasantness” “contrast” “floridness” and “warmth” which are caused by “Kasane-Irome” used in different seasons.
  • Ichiro Katayama; Kazuyoshi Masumi; Tsutomu Aoki
    Journal of Light and Visual Environment 31 (2) 80 - 88 0387-8805 2007/11 [Refereed]
     
    The perceived whiteness of 12 approximate white-color samples was evaluated under four different fluorescent lamps (EXD, EXN, EXWW, and EXL) using a paired comparison method, and then an interval scale was configured. Under all illuminatons, the perceived whiteness of purple and red hue samples was highly evaluated while green and blue-green hue samples were poody evaluated. The C/V index, a perceived whiteness evaluation index, which focused on the brightness-enhancement effect of color components that were included in the approximate white objects or illuminations, showed a high correlation with the interval scale value under each illumination. Furthermore, compared to various color appearance models, the index showed a superior predicting performance. The above findings confirmed that the C/V index was effective in evaluating the perceived whiteness of approximate white objects under different illuminations, and the brightness-enhancement effect of color components was an important factor in determining the perceived whiteness.
  • Elapse Change in Color Rendering Properties of Fluorescent Lamps
    Ichiro Katayama; Tsutomu Aoki
    AIDIA Journal 7 142 - 148 2007/10 [Refereed]
  • Effects of Chromatic Illuminant on Color Emotion and Peripheral Blood Flow
    Ichiro Katayama; Naoko Kagawa; Tsutomu Aoki
    AIDIA Journal 6 174 - 179 2006/10 [Refereed]
  • Age-related Changes in Whiteness Evaluation under Various Illumination
    KATAYAMA Ichiro
    AIDIA Journal 5 217 - 221 2005/11 [Refereed]
  • Effect of the Correlated Color Temperature of Space Illumination on the Hue Discrimination
    Ichiro Katayama; Tsutomu Aoki
    AIDIA Journal 4 13 - 18 2004/10 [Refereed]
  • 空間照度変化に起因する色の見えのモード遷移
    片山一郎; 桝見和孝; 靑木 務
    照明学会誌 88 (8A) 507 - 516 2004/08 [Refereed]
  • 片山一郎; 桝見和孝; 靑木 務
    照明学会誌 86 (5) 286 - 291 2002/05 [Refereed]
  • 色彩感情評価への色の見えモデルの適用
    片山一郎; 張 暁莉; 靑木 務
    日本インテリア学会論文報告集 12 1 - 7 2002/03 [Refereed]
  • KATAYAMA Ichiro; MASUMI Kazuyoshi; AOKI Tsutomu
    Journal of the Illuminating Engineering Institute of Japan The Illuminating Engineering Institute of Japan (IEIJ) 85 (5) 338 - 345 0019-2341 2001/05 [Refereed]
     
    The perceived whiteness of 12 whitish samples with different spectral reflectance distributions (SRDs) was investigated using psychological experiments under two types of illuminants: incandescent lamps and D_<65> simulated ones. The illuminance level was kept constant at 1000 lx. The scale value of the perceived whiteness was determined visually by paired comparison. An index developed in a previous study [J. Illum. Inst. Jpn. Vol.83 No.11 (1999)] was found to accurately estimate the perceived whiteness under various illuminants. The index is proportional to the ratio between the chromatic and achromatic responses in the visual system. In the present study, the index was modified to estimate the perceived whiteness of whitish samples with various SRDs. The modified index correlated highly with the experimental results. It can thus be used to estimate the perceived whiteness of whitish samples with various SRDs under different illuminants.
  • KATAYAMA Ichiro; IIYAMA Masao; MASUMI Kazuyoshi
    Journal of the Illuminating Engineering Institute of Japan The Illuminating Engineering Institute of Japan (IEIJ) 83 (11) 847 - 853 0019-2341 1999/11 [Refereed]
     
    The perceived whiteness of a white object was investigated using psychological experiments. Six types of whitish light sources were used; their spectral distributions were varied by using four kinds of colored filters. The illuminance level was kept constant at 1000 lx. Paired comparison was used to construct the interval scale for the perceived whiteness. A new index was developed to estimate the perceived whiteness under various illuminants. The index is proportional to the ratio between the chromatic and achromatic responses in the visual system. The chromatic response is based on opponent color theory. The index was highly correlated with the results of the experiments. It can thus be used to estimate perceived whiteness under various illuminants and suggests that the chromatic response affects the perceived whiteness.

MISC

  • Improvement of Color Feelings Prediction Formulas for the Estimation of Color Combination Feelings of "Kimono"
    Ichiro Katayama; Sachiko Noguchi; Rumiko Takata; Kaori Segawa  AIC2022 Conference Proceedings  645  -651  2022/06
  • Application of color feelings prediction formulas to the estimation of two-color combination feelings of “kimono”
    Sachiko Noguchi; Rumiko Takata; Kaori Segawa; Ichiro Katayama  AIC2021 Conference Proceedings  527  -532  2021/09
  • Effect of the shade due to the surface unevenness of objects on whiteness perception
    Ichiro Katayama; Kin'nosuke Yamaji  AIC2021 Conference Proceedings  497  -502  2021/09
  • Effect of texture on whiteness perception
    Ichiro Katayama; Kin’nosuke Yamaji; Shogo Nishi; Motonori Doi  AIC2020 Conference Proceedings  324  -328  2020/11
  • Characteristics of the tooth crown colours of people in fashion magazines
    Ichiro Katayama; Etsuko Funabiki; Sumio Yano  AIC2018 Conference Proceedings  339  -343  2018/09
  • Visual evaluation results of whiteness under the illuminant D50 condition and their predictions
    Ichiro Katayama; Sumio Yano  Proceedings of the conference on "Smarter Lighting for Better Life" at the CIE Midterm Meeting 2017  877  -880  2017/10
  • Effects of Watercolor Illusion on Perceived Whiteness
    Ichiro Katayama; Shoko Isawa; Yoshihiko Nakamura; Sumio Yano  AIC2016 Conference Proceedings  314  -317  2016/10
  • Toru Sawai; Ichiro Katayama; Tamio Ida; Takeshi Kajimoto  The 12th International Conference on Power Engeneering  2015/12  [Refereed]
  • Development of a formula for estimating properties of upgraded wood pellets by pyrolysis treatment using colorimetric values
    Toru Sawai; Ichiro Katayama; Tamio Ida; Takeshi Kajimoto; Hiroki Imamura  The 10th International Symposium on Advanced Science and Technology in Experimental Mechanics  2015/11  [Refereed]
  • Performance comparison of various whiteness formulas based on visual evaluation experiments
    Ichiro Katayama  Proceedings of 28th CIE Session 2015  1072  -1080  2015/07
  • The relationship between whiteness perception of watercolor illusion and color vision characteristics
    Shoko Isawa; Koichi Iga; Ichiro Katayama; Tsuneo Suzuki  AIC2015 Conference Proceedings  835  -838  2015/05
  • Relationship between perceived whiteness and color vision characteristics
    Ichiro Katayama; Koichi Iga; Shoko Isawa; Tsuneo Suzuki  AIC2015 Conference Proceedings  782  -786  2015/05
  • Optical design of sunglass lenses for archery competitions using CIECAM02
    Ichiro Katayama; Masahiko Okamoto; Kenta Noda; Noboru Kawanishi  AIC2014 Conference Proceedings  717  -721  2014/10
  • Evaluation of color discrimination property for sunglasses based on the color gamut area ratio
    Ichiro Katayama; Masahiko Okamoto; Kimio Matsumoto; Kenta Noda  AIC2013 Conference Proceedings  181  -184  2013/07
  • Testing the performance of whiteness formulas using the PF/3 and STRESS indices
    Manuel Melgosa; Ichiro Katayama; Maria D. Huete; Pedro A. García  AIC2013 Conference Proceedings  173  -176  2013/07
  • Comparison of Various Whiteness Formulae based on Results of Whiteness Evaluation Experiments
    Ichiro Katayama; Hiroko Uchida; Hiroaki Sobagaki; Gorow Baba  AIC2012 Conference Proceedings  610  -613  2012/09
  • Whiteness of paper containing fluorescent whitening agent under white LED and fluorescent lamp illumination
    Ichiro Katayama  AIC2011 Conference Proceedings  463  -466  2011/06

Industrial Property Rights

  • 特許6037266:眼用レンズの視認性評価方法    2016/11/11
    片山一郎, 岡本正彦, 松本公男, 野田健太

Awards & Honors

  • 2019 日本歯科色彩学会 学会賞(論文)
     
    受賞者: 片山 一郎
  • 2000 照明学会 研究奨励賞
     JPN

Research Grants & Projects

  • Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    Date (from‐to) : 2021/04 -2025/03 
    Author : 片山 一郎; 土居 元紀; 西 省吾
     
    白紙や白布などの白色製品は, 白さの程度によってその価値が左右される.そのため, 古くから増白技術や白さの定量的評価方法が研究されてきた. 一方,多くの白色物体は,その表面に固有のテクスチャを有し,われわれはテクスチャに起因する輝度の2次元分布に基づいて,白色を知覚している.しかし,テクスチャが白色知覚に与える影響は未解明であり,現行の白色度評価法は, 測定領域を平均化した輝度情報に基づくため, テクスチャを有する白色物体の適切な評価ができない. そこで本研究は,テクスチャが白色感に与える影響を明らかにし,新たな白色度評価方法の提案を目指している. 令和3年度は,テクスチャが異なる壁紙3種類と布3種類を標準刺激として選定し,テクスチャの3次元形状および輝度の2次元分布を測定するとともに,表面が平滑な比較刺激との白さを比較する視感評価実験を行った. 被験者に一定照度で照明された標準刺激と白さが等しくなるように比較刺激の照度を調整させ,その時の比較刺激の輝度(主観的等価輝度)を記録した. その結果,視覚系のコントラスト感度が最大となる周波数帯域の空間周波数成分を多く含む表面では,平均輝度以上に明るくより白く知覚される傾向が見られた.これは,低輝度部分を一様な高明度表面の凹凸によってできた低照度領域と知覚するか,さまざまな輝度成分から構成される表面と知覚するかの違いによるものと考えられる.
  • オンラインでの手話の見やすさを考える-カラーユニバーサルデザインに基づく手・服・背景の組み合わせ-
    公益財団法人 三菱財団:社会福祉事業・研究助成金
    Date (from‐to) : 2022/10 -2023/09 
    Author : 長谷川由美; 片山一郎
  • Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    Date (from‐to) : 2018/04 -2022/03 
    Author : Katayama Ichiro
     
    In this study, we conducted visual evaluation experiments to clarify the effect of texture on white perception using textured images by luminance modulation and real object samples with uneven surface. The subjective equivalent luminance was higher than the average luminance in both the images and the real objects, and thus the whitening effect was observed. It is considered that this is because the low-luminance part of the stimulus is perceived not as a low reflectance region but as a shadow of a uniform white surface caused by unevenness.
  • Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    Date (from‐to) : 2018/04 -2022/03 
    Author : FUNABIKI Etsuko
     
    Stations and surrounding squares are attracting attention as they play an important role in the formation of compact urban areas. Therefore, this study aims to use a visual line measuring device to grasp the perception of space by human vision and to demonstrate spatial design techniques to realize a safe and secure space around the station. Analysis of the pedestrian's frequency of gaze and the influence of the pedestrian on the object of gaze and the pedestrian's influence in the square and in front of the ticket gate revealed that the object and the frequency of gaze are determined by the subject.
  • Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research
    Date (from‐to) : 2018/04 -2021/03 
    Author : ISAWA Shoko
     
    Since no previous research exists on the application of the watercolor illusion effect to improve whiteness perception, the feasibility of applying this effect was investigated, for example, in graphic printing and clothing design. A stimulus presentation device was used to acquire whiteness perception data, and psychophysical experiments were performed. To verify the effect of the changes in the brightness of two chromatic colors used in designs to improve whiteness perception, chromatic brightness was set at three levels: low, medium, and high. Whiteness evaluation experiments were performed using the two-alternative forced-choice method. The obtained results confirmed that changes in the brightness of a combination of two chromatic colors affected whiteness perception owing to the watercolor illusion effect.

Committee Membership

  • 2017/07 - Today   CIE   JTC-10
  • 2016/01 - Today   CIE   TC1-95


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