Study of Image Enhancement Techniques: A Review

The aim of image enhancement is to improve the interpretability or perception of information in images for human viewers, or to providebetter' input for other automated image processing techniques. Histogram equalization (HE) is one of the effective & simple technique for enhancing image quality. However, the conventional histogram equalization methods usually result in excessive contrast enhancement. This paper presents a review of histogram techniques for image contrast enhancement. The major difference among the methods is only the criteria used to divide the input histogram.