Computational color constancy using chromagenic filters in color filter arrays
Original version
Shrestha, R. & Hardeberg, J. Y. (2012). Computational color constancy using chromagenic filters in color filter arrays. Proceedings of SPIE, the International Society for Optical Engineering, 8298. http://dx.doi.org/10.1117/12.912073Abstract
We have proposed, in this paper, a new color constancy technique, an extension to the chromagenic color constancy.
Chromagenic based illuminant estimation methods take two shots of a scene, one without and one with a specially chosen
color filter in front of the camera lens. Here, we introduce chromagenic filters into the color filter array itself by placing
them on top of R, G or B filters and replacing one of the two green filters in the Bayer’s pattern with them. This allows
obtaining two images of the same scene via demosaicking: a normal RGB image, and a chromagenic image, equivalent
of RGB image with a chromagenic filter. The illuminant can then be estimated using chromagenic based illumination
estimation algorithms. The method, we named as CFA based chromagenic color constancy (or 4C in short), therefore,
does not require two shots and no registration issues involved unlike as in the other chromagenic based color constancy
algorithms, making it more practical and useful computational color constancy method in many applications.
Experiments show that the proposed color filter array based chromagenic color constancy method produces comparable
results with the chromagenic color constancy without interpolation.
Description
This is the copy of journal's version originally published in Proc. SPIE 8298: http://dx.doi.org/10.1117/12.912073. Reprinted with permission of SPIE.