Image Contrast Enhancement Using Discrete Dual Hahn Moments

The main objective of this paper is to develop a simple technique for contrast enhancement of monochrome and color images using Discrete Dual Hahn (DDH) moments. The basic idea of our approach is to measure a local contrast at each band of a DDH moment matrix and use it to modify them. These modified moments are used to construct the enhanced image by taking the inverse DDH moment transform. For color images only luminance image was enhanced using the above procedure. Hence, other components are not changed. We compute image entropy, coefficient of information content and universal quality index for verifying the results with alpha rooting, Kratchouk moment and Tchebichef moment based approaches.