Wavelet based contrast enhancement for still images

This paper presents a fast and simple contrast enhancement technique, that uses the Dual-Tree Complex Wavelet transform (DTCWT), coupled with the bivariate Laplace model for local adaptive contrast improvement. In order to overcome the noise amplification that results from nonlinear operations especially in the homogeneous areas of the image, denoising using bishrink filter in the DTCWT domain is used.