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Color constancy: The role of low-level mechanisms

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image of Spatial Vision
For more content, see Multisensory Research and Seeing and Perceiving.

Color constancy (CC) is an important psychophysical phenomenon, which has been studied extensively. However, it is not clearly understood. This study presents a novel biological model for the contribution of low level mechanisms to CC. The model is based on two chromatic adaptation mechanisms in the color-coded retinal ganglion cells, 'local' and 'remote', which cause a 'curve-shifting' effect at each receptive field subregion. Simulations are employed for calculating the perceived image and measuring the degree of CC using both 'human-perception' and 'machine-vision' indices. The results indicate that the contribution of adaptations to CC is significant, robust and in agreement with experimental findings. The model is successful in performing CC under multiple chromatic illumination sources, a condition which mimics common natural environments.


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