Color image enhancement algorithm based on logarithmic transform coefficient histogram

This paper presents a new technique for color enhancement based on manipulation of the histogram of logarithmic transform coefficients. The proposed technique is simple but more effective than some existing techniques in most case. This method is based on the properties of the histogram of DCT coefficients, also use the fact that the relationship between stimulus and perception is logarithmic and can afford a marriage between enhancement qualities and computational efficiency. A human visual system-based quantitative measurement of image contrast improvement is also used to determine the optimal parameters for the algorithm. A number of experimental results are presented to illustrate the performance of the proposed algorithm.