Contrast Enhancement of Gray Image using proposed mask in Discrete Cosine Transform Domain
Nivedita V. Hippalgaonkar, Shaila Dinkar Apte · International journal of innovation and applied studies · 2014
In this paper contrast of gray image is enhanced using proposed mask in discrete cosine transform and discrete wavelet transform domain. In this technique the image is converted into DCT and DWT domain and respective coefficients are modified using proposed mask for its domain then the enhanced image is reconstructed using inverse transform. The discrete cosine transform outperforms with better image quality and highest PSNR value. We compare this approach with enhancement based on the discrete wavelet transform.