The colour constancy strategy consists of the simple yet effective operation of normalizing each colour channel to length 1. As well, the dimensionality of colour is reduced to two-dimensional chromaticity. This results in an indexing scheme based on only a few values, and lends itself to a binary search approach to transition detection. The resulting method yields better values of Precision and Recall than previous methods. Moreover, illumination change produces very few false positives.
Colour correction is an important tool for digital colour imaging and reproduction.
I am interested in statistical, analytic, and optimization techniques for making tractable a difficult problem with a long history. To date, successful techniques have been developed and also implemented in some hardware for the colour correction task in digital still cameras. The methods developed also have applicabililty to colour scanners and, most recently, colour inkjet printers. Spectral modelling in Computer Graphics can produce much more photorealistically accurate images than simplistic RGB methods. Nevertheless 3-band methods are ubiquitous.