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Variability in Color Discrimination Data Explained by a Generic

Summary: Variability in Color Discrimination
Data Explained by a Generic
Model with Nonlinear and
Adaptive Processing
David Alleysson,* Jeanny He´ rault
Laboratoire des Images et des Signaux LIS-INPG/UJF, 46 av. Felix Viallet 38031 Grenoble Cedex, France
Received 27 August 1999; accepted 27 October 1999
Abstract: A generic model of color discrimination is pre-
sented. It involves adaptive nonlinearities at photoreceptor
level and in color-opponent pathways. This model, with few
parameters, can reproduce the various aspects of the ob-
served data from six individual observers, as reported in
studies by MacAdam, Wyszecki and Fielder, and Brown and
MacAdam. It is base on two main hypotheses: (1) all the
observers have the same kind of nonlinear adaptive func-
tions; (2) each observer has his or her own coding of color
oppositions. Therefore, for each observer, the mean model
parameters are adjusted to fit all the data in the particular
available experimental conditions. The model is unique, one
set of its parameters depends only on the adaptation state,


Source: Alleysson, David - Laboratoire de Psychologie et NeuroCognition, Université Pierre Mendes France


Collections: Biology and Medicine