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Proceedings Paper

Divisive inhibition model for chromoluminance pattern equidiscrimination contours
Author(s): Chien-Chung Chen; John M. Foley; David H. Brainard
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Paper Abstract

We studied the detection of chromoluminance patterns in the presence of chromoluminance pedestals. We examined how thresholds depend on the color directions of the target and the pedestal. Both targets and pedestals were spatial Gabor patterns. The patterns were spatially modulated in color, luminance or both. Equidiscrimination contours describe contrast thresholds for targets in different color directions on the same pedestal. We measured the equidiscrimination contours on green/red and blue/yellow pedestals. The equidiscrimination contours changes with the contrast and the color directions of the pedestals. We applied a model with three pairs of mechanisms that we proposed earlier to these data. Each mechanism consists of a linear receptive-field like color-spatial operator followed by a nonlinear process. The nonlinear process takes two inputs: the excitation comes directly from the linear operator and the divisive inhibition is a nonlinear sum of all linear operator response. Two linear operator pairs are color opponent while the third is non-opponent. The detection variable is computed from the outputs of the nonlinear processes combine by Quick's pooling rule.

Paper Details

Date Published: 19 May 1999
PDF: 10 pages
Proc. SPIE 3644, Human Vision and Electronic Imaging IV, (19 May 1999); doi: 10.1117/12.348484
Show Author Affiliations
Chien-Chung Chen, Smith-Kettlewell Eye Research Institute (Canada)
John M. Foley, Univ. of California/Santa Barbara (United States)
David H. Brainard, Univ. of California/Santa Barbara (United States)

Published in SPIE Proceedings Vol. 3644:
Human Vision and Electronic Imaging IV
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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