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Guided patch-wise nonlocal SAR despeckling

Sergio Vitale 1      Davide Cozzolino 2      Giuseppe Scarpa 2      Luisa Verdoliva 2      Giovanni Poggi 2     
1 Engineering Department of University Parthenope, Naples, Italy
2 Department of Electrical Engineering and Information Technology, University Federico II of Naples, Italy


We propose a new method for SAR image despeckling which leverages information drawn from co-registered optical imagery. Filtering is performed by plain patch-wise nonlocal means, operating exclusively on SAR data. However, the filtering weights are computed by taking into account also the optical guide, which is much cleaner than the SAR data, and hence more discriminative. To avoid injecting optical-domain information into the filtered image, a SAR-domain statistical test is preliminarily performed to reject right away any risky predictor. Experiments on two SAR-optical datasets prove the proposed method to suppress very effectively the speckle, preserving structural details, and without introducing visible filtering artifacts. Overall, the proposed method compares favourably with all state-of-the-art despeckling filters, and also with our own previous optical-guided filter.



author={S. Vitale and D. Cozzolino and G. Scarpa and L. Verdoliva and G. Poggi}, 
title={Guided patch-wise nonlocal SAR despeckling},