Modified Edge Based Color Constancy Using Non-Local Means

The color constancy is a procedure that measures the influence of different light sources on a digital image. The goal of the computational color constancy is to account for the effect of the illuminate.Many traditional methods such as Grey-world method, Max RGB and learning-based method were used to measure the color constancy of digital images affected by light source. All these methods have an obvious disadvantage that the light source across the scene is spectrally uniform. This assumption is often violated as there might be more than one light source illuminating the scene. This paper has proposed a modified edge based color constancy using non local means and the adaptive histogram equalization. The proposed algorithm has ability to reduce the uneven illuminate problem of edge based color constancy and also non-local means has produced sharper results. The proposed algorithm is designed and implemented in the MATLAB using image processing toolbox. The comparison among the modified edge based color constancy and the edge based color constancy has shown that the proposed algorithm is quite effective over the available methods.