To eliminate the illumination influence to color image,an illumination compensation method based on homomorphic filtering is proposed.In frequency range,the homomorphic filtering is employed to process the image,and the Butterworth high pass filtering function is introduced into the homomorphic filter to design a new dynamic Gauss homomorphism filter.Then the luminance component of the image in YIQ color space is enhanced and the chrominance component maintains invariable,by which the high frequency compone...