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Proceedings Paper

Relationship between color discrimination threshold and suprathreshold color-difference perception
Author(s): Haisong Hu; Hirohisa Yaguchi; Satoshi Shioiri
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Paper Abstract

Based on the psychophysical method of constant stimuli, an experiment was carried out, using CRT-generated stimuli and in CIELAB color space, to test the visual color differences in relation to colorimetric scales. The CIE Gray and Blue color centers, the most basic color and, perceptually, the most different color, respectively, were chosen, and the maximum average size of test color difference was 12 CIELAB ΔE units. The resultant visual data, procesed via probit analysis, were used to analyze the relationship between color discrimination threshold and suprathreshold color-difference preception. The equal color-difference contours, corresponding to all the visual scales, 4.0, 8.0, and 12.0 CIELAB ΔE units, were well fitted into ellipses while maintaining the orientation of the threshold one, but the shapes were not completely the same, especially at Blue center. The comparisons between visual color differences and their colorimetric counterparts, in teh CIELAB ΔE units or threshold units, show linear relations at both color centers, but the slopes were, in general, not equal to 45° and differed for all directions. Thus the suprathreshold color differences can be derived by enlarging the thresholds linearly but not uniformly, i.e. with different ratios for individual directions.

Paper Details

Date Published: 6 June 2002
PDF: 4 pages
Proc. SPIE 4421, 9th Congress of the International Colour Association, (6 June 2002); doi: 10.1117/12.464663
Show Author Affiliations
Haisong Hu, Chiba Univ. and Zhejiang Univ. (Japan)
Hirohisa Yaguchi, Chiba Univ. (Japan)
Satoshi Shioiri, Chiba Univ. (Japan)

Published in SPIE Proceedings Vol. 4421:
9th Congress of the International Colour Association
Robert Chung; Allan Rodrigues, Editor(s)

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