Image Enhancement Using Modified Exposure Based Histogram

Abstract: This paper addresses the contrast enhancement of low gray scale images by implementing the Histogram Equalization method using Exposure value. The Exposure value of an image is calculated using the maximum intensity present in the histogram and the image gets divided into sub-images using exposure value. The enhancement rate of the image is controlled by performing histogram clipping. The individual histogram of sub images is equalized independently by using equalization based on exposure and integrated into one image for analysis. The proposed method results in a better contrast enhancement of gray scale images as well as for color images and improves image quality, entropy preservation.

Keywords: Image Enhancement, Image Segmentation, Image Exposure, Histogram, Histogram clipping.