GONG Jun-liang, HE Xin, WEI Zhong-hui, WANG Fang-yu. Local Adaptive Image Denoising Based on Bayesian Estimation in Shearlet Domain[J]. , 2013,28(5): 799-804
GONG Jun-liang, HE Xin, WEI Zhong-hui, WANG Fang-yu. Local Adaptive Image Denoising Based on Bayesian Estimation in Shearlet Domain[J]. , 2013,28(5): 799-804 DOI: 10.3788/YJYXS20132805.0799.
Based on the combination of Bayesian estimation and Shearlet transform
an algorithm for image denoising is proposed. In order to get Shearlet coefficients in all scales and directions
image with additive white Gaussian noise is processed by Shearlet transform. With the dependencies of the Shearlet coefficients
the new method select a proper neighbo-ring window by centering the current coefficient within it
and conclude the MAP expression and sub-band thresholds under Bayesian maximum posterior probability criteria when Shearlet coefficients is thought to have Laplace prior distribution
then made shrinkage on it by soft threshold. Inverse Shearlet transform is performed to the processed coefficients and get the denoised image. The experimental results demonstrate that compared with traditional wavelet domain denoising algorithms
the proposed method not only improves peak ratio of signal to noise but also have a remarkable visual effects.
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