Wavelet based image denoising with a mixture of Gaussian distributions with local parameters

H. Rabbani, M. Vafadoost, I. Selesnick

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The performance of various estimators, such as maximum a posteriori (MAP) is strongly dependent on correctness of the proposed model for noise-free data distribution. Therefore, the selection of a proper model for distribution of wavelet coefficients is very important in the wavelet based image denoising. This paper presents a new image denoising algorithm based on the modeling of wavelet coefficients in each subband with a mixture of Gaussian probability density functions (pdfs) that parameters of mixture model are local. The mixture model is able to capture the heavy-tailed nature of wavelet coefficients and the local parameters can model the empirically observed correlation between the coefficient amplitudes. Therefore, by using this relatively new statistical model, we are able to better model statistical property of wavelet coefficients. Within this framework, we describe a novel method for image denoising based on designing a MAP estimator, which relies on the mixture distributions with high local correlation. The simulation results show that our proposed technique achieves better performance than several published methods both visually and in terms of peak signal-to-noise ratio (PSNR).

Original languageEnglish (US)
Title of host publicationProceedings ELMAR-2006 - 48th International Symposium ELMAR-2006 Focused on Multimedia Signal Processing and Communications
Pages85-88
Number of pages4
DOIs
StatePublished - 2006
EventELMAR-2006 - 48th International Symposium ELMAR-2006 focused on Multimedia Signal Processing and Communications - Zadar, Croatia
Duration: Jun 7 2006Jun 9 2006

Publication series

NameProceedings Elmar - International Symposium Electronics in Marine
ISSN (Print)1334-2630

Other

OtherELMAR-2006 - 48th International Symposium ELMAR-2006 focused on Multimedia Signal Processing and Communications
CountryCroatia
CityZadar
Period6/7/066/9/06

Keywords

  • Complex Wavelet Transform
  • MAP Estimator
  • Mixture Model

ASJC Scopus subject areas

  • Engineering(all)

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