Multiresolution Bilateral Filtering for Image Denoising

Authors:
Ming Zhang;B. K. Gunturk
Affiliations:
Dept. of Electr. & Comput. Eng., Louisiana State Univ., Baton Rouge, LA;-
Venue:
IEEE Transactions on Image Processing
Year:
2008

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Abstract

The bilateral filter is a nonlinear filter that does spatial averaging without smoothing edges; it has shown to be an effective image denoising technique. An important issue with the application of the bilateral filter is the selection of the filter parameters, which affect the results significantly. There are two main contributions of this paper. The first contribution is an empirical study of the optimal bilateral filter parameter selection in image denoising applications. The second contribution is an extension of the bilateral filter: multiresolution bilateral filter, where bilateral filtering is applied to the approximation (low-frequency) subbands of a signal decomposed using a wavelet filter bank. The multiresolution bilateral filter is combined with wavelet thresholding to form a new image denoising framework, which turns out to be very effective in eliminating noise in real noisy images. Experimental results with both simulated and real data are provided.