Heuristic wavelet shrinkage for denoising

Authors:
Chan-Cheng Liu;Tsung-Ying Sun;Shang-Jeng Tsai;Yu-Hsiang Yu;Sheng-Ta Hsieh
Affiliations:
Institution of Information Science, Academia Sinica, Taipei, Taiwan, ROC;Department of Electrical Engineering, National Dong Hwa University, Hualien, Taiwan, ROC;Department of Electrical Engineering, National Dong Hwa University, Hualien, Taiwan, ROC;Department of Electrical Engineering, National Dong Hwa University, Hualien, Taiwan, ROC;Department of Communication Engineering, Oriental Institute of Technology, Taipei County, Taiwan, ROC
Venue:
Applied Soft Computing
Year:
2011

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Abstract

Noise reduction without any prior knowledge of noise or signals is addressed in this study. Compared with conventional filters, wavelet shrinkage can respect this requirement to reduce noise from received signal in wavelet coefficients. However, wavelet threshold depends on an estimate of noise deviation and a weight relating signal's length cannot be applied in every case. This paper uses particle swarm optimization (PSO) to explore a suitable threshold in a complete solution space, named PSOShrink. A general-purpose objective function which is derived from blind signal separation (BSS) theory is further proposed. In simulation, four benchmarks signals and three degrading degrees are testing; meanwhile, three existing algorithm with state-of-the-art are performed for comparison. PSOShrink can not only recovers source signals from a heavy blurred signal but also remains details of a source signal from a light blurred signal; moreover, it performs outstanding denoising in every simulation case.