Mixed Local-Global Criterion for Image Denoising in the Wavelet Domain

F. García-Ugalde and B. Pšenička (Mexico)


Image denoising, wavelets


This paper presents an image denoising method based on a two-step empirical Bayes approach. A linear minimum mean squared error-like estimation is performed to estimate the wavelet coefficients of the denoised image. These coefficients rely on a suitable estimation of the variance of the wavelet coefficients for the “clean” image. The later uses maximum likelihood estimation over a local neighborhood. As opposed to the approach presented in [3], the estimation of the variance of the coefficients for the “clean” image is performed only at locations corresponding to father and descendant wavelet coefficients greater than a threshold T. Thus, the proposed method is based on a mixed local-global criterion in the wavelet domain and the results achieved are among the best reported in the literature.

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