Sensory, computational and cognitive components of human colour constancy

Sensory, computational and cognitive components of human colour constancy.

When the illumination on a scene changes, so do the visual signals elicited by that scene. In spite of these changes, the objects within a scene tend to remain constant in their apparent colour. We start this review by discussing the psychophysical procedures that have been used to quantify colour constancy. The transformation imposed on the visual signals by a change in illumination dictates w...

A computational analysis of colour constancy

Four issues concerning colour constancy and relational colour constancy

Four issues concerning colour constancy and relational colour constancy are briefly considered: (1) the equivalence of colour constancy and relational colour constancy; (2) the dependence of relational colour constancy on ratios of cone excitations due to light from different reflecting surfaces, and the association of such ratios with von Kries' coefficient rule; (3) the contribution of chroma...

Colour constancy

What is colour constancy? Colour constancy is the tendency of objects to appear the same colour even under changing illumination. A yellow banana appears yellow whether you see it in the tungsten light of the kitchen or in sunlight outdoors. Under these different conditions, the banana reflects very different light spectra to your eyes, but you see instead its unchanging material properties. Th...

Relaxed Grey-World: Computational Colour Constancy by Surface Matching

In this paper we present a new approach to computational colour constancy problem based on the process of surface matching. Classical colour constancy methods do not usually rely on this important source of information and they often use only partial information in the images. Our proposal is to introduce the use of a set of canonical surfaces and its matching versus the content of the image us...