Combination of histogram segmentation and modification to preserve the original brightness of the images

Abstract

Image enhancement by preserving the original brightness is the main challenge of the consumer electronics field. This paper concentrates on the modification of traditional histogram equalization (HE) method to increase its brightness preserving ability. In literature mainly two types of variants have been proposed based on segmentation and modification of the histogram. Both variants are able to preserve the original brightness to some extent. Actually the efficiency of these variants of HE depend on the optimal segmentation and proper modification of histogram. This study concentrates to prove that histogram segmentation or modification which one is better to preserve the image’s original brightness and how much it can be preserved by using the combination of two variants. New hybrid variants of HE method have been proposed in this paper to prove that fact. Results of the proposed methods have been analyzed visually and mathematically.