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Modeling color percepts of dichromats.
Wachtler T, Dohrmann U, Hertel R.
fur Biologie III, Albert-Ludwigs-Universitat, Schanzlestr. 1, 79104
Freiburg, Germany. email@example.com
and deuteranopes, despite lacking a chromatic dimension at the receptor
level, use the color terms "red" and "green", together with "blue" and
"yellow", to describe their color percepts. Color vision models
proposed so far fail to account for these findings in dichromats. We
confirmed, by the method of hue scaling, the consistent use of these
color terms, as well as their dependence on intensity, in subjects
shown to have only a single X-chromosomal opsin gene each. We present a
model for the processing of photoreceptor signals which, under
physiologically plausible assumptions, achieves a trichromat-like
representation of dichromatic receptor signals. Key feature of the
dichromat model is the processing of the photoreceptor signals in
parallel channels with different gains and nonlinearities. In this way,
the two-dimensional receptor signals are represented on a manifold in a
higher-dimensional space, supporting categorization for efficient image
segmentation. Introducing a third cone opsin yields a model that
explains normal, trichromat hue scaling.
PMID: 15342228 [PubMed - indexed for MEDLINE]