Table of Contents Author Guidelines Submit a Manuscript
Advances in Multimedia
Volume 2014, Article ID 682747, 14 pages
http://dx.doi.org/10.1155/2014/682747
Research Article

Salt and Pepper Noise Removal with Noise Detection and a Patch-Based Sparse Representation

1School of Computer and Information Engineering, Fujian Provincial University Key Laboratory of Internet of Things Application Technology, Xiamen University of Technology, Xiamen 361024, China
2Department of Electronic Science, Xiamen University, Xiamen 361005, China

Received 9 November 2013; Revised 30 January 2014; Accepted 30 January 2014; Published 13 March 2014

Academic Editor: Martin Reisslein

Copyright © 2014 Di Guo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Images may be corrupted by salt and pepper impulse noise due to noisy sensors or channel transmission errors. A denoising method by detecting noise candidates and enforcing image sparsity with a patch-based sparse representation is proposed. First, noise candidates are detected and an initial guide image is obtained via an adaptive median filtering; second, a patch-based sparse representation is learnt from this guide image; third, a weighted - regularization method is proposed to penalize the noise candidates heavier than the rest of pixels. An alternating direction minimization algorithm is derived to solve the regularization model. Experiments are conducted for 30%90% impulse noise levels, and the simulation results demonstrate that the proposed method outperforms total variation and Wavelet in terms of preserving edges and structural similarity to the noise-free images.