I. Introduction
The spectral power distribution reflected from a surface is a mixture of light spectrum and surface reflectance spectrum. The latter is a "still" property of a given material, which is beneficial for human eyes to identify materials based on color cues. This task, in the field of color vision, is termed as Color Constancy. Computational approaches aims to achieve color constancy relying on 1) estimating the ambient illumination color and then 2) applying a color correction step. Even though some pschophysical studies [1] have shown the superior ability of human eyes in color constancy, which still remains challenging and needs to be farther investigated in color research.