Edge-Based Color Constancy

J. van de Weijer, T. Gevers, A. Gijsenij
2007 IEEE Transactions on Image Processing  
Color constancy is the ability to measure colors of objects independent of the color of the light source. A well-known color constancy method is based on the Grey-World assumption which assumes that the average reflectance of surfaces in the world is achromatic. In this article, we propose a new hypothesis for color constancy namely the Grey-Edge hypothesis, which assumes that the average edge difference in a scene is achromatic. Based on this hypothesis, we propose an algorithm for color
more » ... thm for color constancy. Contrary to existing color constancy algorithms, which are computed from the zero-order structure of images, our method is based on the derivative structure of images. Furthermore, we propose a framework which unifies a variety of known (Grey-World, max-RGB, Minkowski norm) and the newly proposed Grey-Edge and higher-order Grey-Edge algorithms. The quality of the various instantiations of the framework is tested and compared to the state-of-the-art color constancy methods on two large data sets of images recording objects under a large number of different light sources. The experiments show that the proposed color constancy algorithms obtain comparable results as the state-of-the-art color constancy methods with the merit of being computationally more efficient.
doi:10.1109/tip.2007.901808 pmid:17784594 fatcat:elqqd4ewy5borpvnyf2cczumlq