Sensitivity to modulation of color distribution in multicolored textures.
We evaluated the discriminability of color distributions in square-element textures. Each texture contained 225 colors, represented by a distribution of color vectors in color space defined by the L-M and S-(L+M) axes. Each color distribution was systematically manipulated by modulating the distribution of the vector lengths sinusoidally as a function of the direction in the color space. The results showed that it is difficult to resolve a color distribution modulated in more than three cycles per 360 degrees in the chromatic direction. The difference in components along the cardinal axes is not a critical factor in the discrimination of the color distribution. An analysis using a line-element model suggested that the discrimination of the color distribution is mediated by multiple chromatic channels that are tuned to a variety of directions in the color space with a half-height-half-bandwidth of about 40 degrees in the chromatic direction.
Goda
N
N
ATR Human Information Processing Research Laboratories, 2-2 Hikaridai, Seika-cho, Soraku-gun, 619-0288, Kyoto, Japan. ngoda@isd.atr.co.jp
Fujii
M
M
D003118:Color Perception / Q000502:physiology*; D015350:Contrast Sensitivity / Q000502:physiology*; D004056:Differential Threshold / Q000502:physiology; D004192:Discrimination, Psychological / Q000502:physiology*; D006801:Humans; D011594:Psychometrics; D017949:Retinal Cone Photoreceptor Cells / Q000502:physiology