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Contrast gain control: a bilinear model for chromatic selectivity

B Singer¹, M D'Zmura

¹Department of Cognitive Sciences, University of California, Irvine 92717.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|April 1, 1995

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Color contrast induction experiments reveal that induced contrast linearly depends on both disk and annulus contrast at low to moderate levels. A bilinear model explains these findings, showing chromatic selectivity in gain control.

Area of Science:

Visual perception
Color vision
Neuroscience

Background:

Previous research demonstrated temporal contrast modulation can induce apparent contrast changes in a central disk at isoluminance.
Understanding interactions between luminance and color-opponent channels is crucial for visual processing models.

Purpose of the Study:

To investigate the interactions between luminance and color-opponent channels in color contrast induction.
To develop and validate a model for color contrast gain control based on psychophysical data.

Main Methods:

Conducted psychophysical experiments varying chromatic properties of central disks and surrounding annuli.
Systematically analyzed induced contrast magnitude and chromatic properties under different contrast levels.

Related Experiment Videos

Main Results:

Induced contrast showed a linear dependence on both disk and annulus contrast at low to moderate levels.
The proposed bilinear model accurately predicted the magnitude and chromatic characteristics of induced contrast.
Demonstrated chromatic selectivity in contrast gain control and minimal isoluminant effects on achromatic contrast.

Conclusions:

A bilinear model for color contrast gain control, realized as feed-forward multiplicative gain control, effectively explains experimental findings.
Saturating nonlinearities were incorporated to account for data at high contrast levels.
The model highlights the chromatic selectivity of visual system's contrast processing.