Lee and the sigma lters, most new development of lters is in the nonlocal or patch- based frame-
work. The reported patch- based techniques have shown an excellent performance in speckle reduc-
tion of single- and multi- channel SAR images as compared to conventional local- based techniques.
We see that the current horizons of despeckling are moving towards this nonlocal framework. The
heart of the patch- based approach is the denition of the similarity criterion, while several measures
have been developed so far that are not only useful for despeckling, but can also be used for clas-
sication, change detection, and target identication. Some open issues still remain to be resolved,
although the patch- ...
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