Demultiplexing, orientation selectivity, and spatial filters in color vision

Eugenio Martinez-Uriegas

doi:10.1117/12.152720

8 September 1993 Demultiplexing, orientation selectivity, and spatial filters in color vision

Eugenio Martinez-Uriegas

Proceedings Volume 1913, Human Vision, Visual Processing, and Digital Display IV; (1993) https://doi.org/10.1117/12.152720
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1993, San Jose, CA, United States

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.

Citation Download Citation

Eugenio Martinez-Uriegas "Demultiplexing, orientation selectivity, and spatial filters in color vision", Proc. SPIE 1913, Human Vision, Visual Processing, and Digital Display IV, (8 September 1993); https://doi.org/10.1117/12.152720

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