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Proceedings Paper

Demultiplexing, orientation selectivity, and spatial filters in color vision
Author(s): Eugenio Martinez-Uriegas
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Paper Abstract

Chromatic-achromatic demultiplexing is the only model that merges three neurophysiological characteristics found only after precortical levels of vision processing in primates: (1) orientation selectivity, (2) interaction of on and off cells, and (3) color decoding. For example, a demultiplexing cortical unit is selective to purely achromatic changes only when they take place at its preferred orientation, but its signal is chromatic-achromatic ambiguous for any other angle; this hypothetical unit is fed with outputs from alternate rows of on and off color- opponent neurons of the lateral geniculate nucleus (LGN). It has a spatial sensitivity profile well described by either difference-of-Gaussian models, Gabor-like models or n-derivative-of- Gaussian models that include orientation tuning. In consequence, current models of spatial filtering and orientation tuning of cortical neurons can be consistently connected with the chromatic-achromatic dimensions through the multiplexing model.

Paper Details

Date Published: 8 September 1993
PDF: 11 pages
Proc. SPIE 1913, Human Vision, Visual Processing, and Digital Display IV, (8 September 1993); doi: 10.1117/12.152720
Show Author Affiliations
Eugenio Martinez-Uriegas, SRI International (United States)

Published in SPIE Proceedings Vol. 1913:
Human Vision, Visual Processing, and Digital Display IV
Jan P. Allebach; Bernice E. Rogowitz, Editor(s)

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