Showing papers on "Color constancy published in 1982"
TL;DR: Von-Kries-invariant reflectance spectra are computed for illuminant spectral power distributions that are arbitrary linear combinations of the first three daylight phases to give color constancy.
Abstract: Necessary and sufficient spectral conditions are presented for Von Kries chromatic adaptation to give color constancy. Von-Kries-invariant reflectance spectra are computed for illuminant spectral power distributions that are arbitrary linear combinations of the first three daylight phases. Experiments are suggested to test models of color constancy using computed spectra (either exact or approximate) within the illuminant-invariant framework.
164 citations
TL;DR: It is approximately true that the visual system discounts the color of an illuminant but not its t and d, which indicates that many common vapor-discharge illuminants systematically distort object colors.
Abstract: Starting with an opponent-colors formulation of color vision, two parameters, t^ and d^, may be defined that express an illuminant’s ability to realize red–green and blue–yellow contrasts of objects. For instance, calculation of t^ and d^ for daylight shows that on a gray day, color contrasts are actually reduced. By these measures, many common vapor-discharge illuminants systematically distort object colors. Because red–green contrasts contribute to border distinctness, and both types of color contrast contribute to brightness, such systematic distortions probably affect the overall clarity and brightness of what is perceived visually. Experimental data are consistent with this idea. In relation to color-constancy (retinex) experiments, it is approximately true that the visual system discounts the color of an illuminant but not its t^ and d^.
31 citations
TL;DR: The ability to temporally resolve color stimuli was compared in young and old adults and data indicate a decline with age in temporal resolution in color vision, which is more appropriately attributed to age-related differences in visual/neural mechanisms than to changes in the ocular media or photoreceptor activity.
Abstract: The ability to temporally resolve color stimuli was compared in young and old adults. Stimuli consisted of pairs of brief green and red flashes separated by six levels of interstimulus interval and presented at two different luminance levels. Integration of the color pairs to produce reports of yellow decreased significantly with increasing interstimulus interval, particularly for the younger group. This difference remained when the age-related loss in retinal illumination was compensated by increased stimulus luminance. These data indicate a decline with age in temporal resolution in color vision. Further, they suggest that age differences in temporal resolution can be more appropriately attributed to age-related differences in visual/neural mechanisms than to changes in the ocular media or photoreceptor activity.
8 citations