This a two stage method in which at first image RGB compensated and then converted to YCbCr to normalise overall illumination of image.Its cascaded implementation of section 2.A of paper "A FAST SKIN REGION DETECTOR" by Phil Chen, Dr.Christos Greecos

matlab的光照补偿程序，可以运行，挺有用的-Matlab Illumination compensation program, you can run quite used