An Automatic Contrast Enhancement Technique Using Combination of Histogram-Based Methods

Abstract— this paper proposes the combination of histogram based methods in order to achieve an improved contrastenhancement technique. in the proposed method, at first the histogram is modified in a way that deals with thehistogram spikes with less computational complexity. a method is then utilized to preserve the mean brightness ofimage. in addition, black and white stretching is applied to increase the quality of resulting image. a new method isalso introduced so that the stretching parameters can be selected proportional to the intensity distribution of eachimage. the proposed method is fully automatic, robust against noise, and user-friendly. experimental results indicatethe efficiency of the new technique from both of the objective and subjective viewpoints.