Color image enhancement algorithms based on the DCT domain

This paper presents a novel modified multi scale contrast enhancement (MMCE) technique for color image enhancement based on manipulating the DCT coefficients. Modified multi contrast enhancement (MCE) is an improved version of multi contrast enhancement by redefining the frequency spectral bands and introducing more band enhancement techniques to achieve a better performance. This paper also uses an image contrast measure SDME to choose the optimal parameters and to demonstrate the effectiveness of the methods. Computer simulations and analysis are shown that the presented method outperforms the commonly used methods such as Retinex and the original MCE for most images.