THE OPPONENT COLOUR FUNCTIONS AND THEIR RELATIONS WITH THE COLOUR DISCRIMINABILITY
Articles
Henrikas Vaitkevicius
Zenius Bliznikas
Žydrunas Stankevicius
Published 1995-01-01
https://doi.org/10.15388/Psichol.1995.0.4464
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Keywords

opponent functions
sensation
perception
colour discriminability

How to Cite

Vaitkevicius H., Bliznikas Z. and Stankevicius Žydrunas (1995) “THE OPPONENT COLOUR FUNCTIONS AND THEIR RELATIONS WITH THE COLOUR DISCRIMINABILITY”, Psichologija, 140, pp. 81-93. doi: 10.15388/Psichol.1995.0.4464.

Abstract

The paper deals with the problem of a construction of opponent functions, which stem from the linear summation of three receptor (R, G, B) signals. It is considered two stages model: stage of the receptors and stage of the opponent cells. Each stage has the own intrinsic independent generators of noise. The colour is determined by the point in three-dimensional space with coordinates {xi}, (i=l, 2, 3), where xi is value of the output signals of the opponent cells. Let V be the volume of “colour body” and be the volume of sphere, where an end of a colour vector is located with a given probability P0. Then a ratio V/s characterizes a colour discriminability: the greater ratio V/s the greater discriminability of the system. It is looking for such transformation of receptor signals into opponent those (i.e. searching a linear operator A), that the ratio V/s would be maximal. The properties of the proposed model were investigated. They fit well to the properties obtained in traditional psychophysical experiments: opponent colour functions, hue coefficients, wavelength and saturation discrimination, achromatic channel sensitivity, non-additivity of brightness. This led to conclusion that the possible role of the colour opponency is ensuring optimal colour discriminability in human vision.
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