Denoising using linear and nonlinear multiresolutions
Sergio Amat, Hedi Cherif, J. Carlos Trillo · Engineering Computations · 2005
Purpose To provide several comparisons between linear and nonlinear approaches in denoising applications. Design/methodology/approach The comparison is based on the peak signal noise ratio (PSNR) image quality measure. Which one of the algorithms gives higher PSNR and then denoises more the original picture is studied. Findings Nonlinear reconstruction operators can improve the accuracy of the prediction in the vicinity of isolated singularities. A better treatment of the singularities corresponding to the image edges and, therefore, an improvement on the sparsity of the multiresolution representation of images are then expected. Research limitations/implications In this paper the point‐value framework is considered. Other frameworks, as the cell‐average discretization, are more suitable for image processing where noise and texture appear. But, the point value schemes can be adapted to the cell‐average discretization using primitive function. Practical implications People can use the new denoising algorithm presented in the paper. Originality/value In this paper nonlinear schemes in the Harten's multiresolution framework that improve the results of the classical linear schemes are presented.