Dr. Anya C. Hurlbert Profile

Dr. Anya C. Hurlbert

Reader in Visual Neuroscience at Univ of Newcastle upon Tyne

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Proceedings Article | 30 May 2002 Paper

Contribution of local and global cone-contrasts to color appearance: a Retinex-like model

Anya Hurlbert, Christopher Wolf

Proceedings Volume 4662, (2002) https://doi.org/10.1117/12.469525

KEYWORDS: Colorimetry, Cones, MATLAB, RGB color model, Detection and tracking algorithms, Visual process modeling, Data modeling, Receptors, Image sensors, Spatial frequencies

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Recent psychophysical experiments demonstrate that for simple configurations, colour appearance is largely determined by the ratios of within-type cone excitations (cone contrasts) between a target surface and its immediate background. Other experiments demonstrate that both the mean and variance of the cone excitations from remote surfaces may influence the colour of a target surface. The relative contribution of local and remote surfaces to the colour appearance of a centrally viewed target also depends on adaptational state and, therefore, on stimulus duration. Cone-contrast models of colour appearance that include the influence of cone excitations from local and global surfaces may be viewed as modern-day successors of the Retinex model for colour constancy. Here we describe psychophysical experiments of colour matching under simulated illumination changes, and examine the effects of the size and configuration of local and remote chromatic elements in a complex background on the colour appearance of a central target. We compare the observed colour matches with predictions from a standard Retinex model and from a modified Retinex-like model with weighting factors on the distance-order of chromatic edges.

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