Divisive inhibition model for chromoluminance pattern equidiscrimination contours

Chien-Chung Chen; John M. Foley; David H. Brainard

doi:10.1117/12.348484

19 May 1999 Divisive inhibition model for chromoluminance pattern equidiscrimination contours

Chien-Chung Chen, John M. Foley, David H. Brainard

Author Affiliations +

Proceedings Volume 3644, Human Vision and Electronic Imaging IV; (1999) https://doi.org/10.1117/12.348484
Event: Electronic Imaging '99, 1999, San Jose, CA, United States

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.

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Chien-Chung Chen, John M. Foley, and David H. Brainard "Divisive inhibition model for chromoluminance pattern equidiscrimination contours", Proc. SPIE 3644, Human Vision and Electronic Imaging IV, (19 May 1999); https://doi.org/10.1117/12.348484

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