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Speckle reduction: filtering related to spatial resolution

We have experimented on the effects on SAR ERS1 scenes of two classes of filters designed for speckle reduction according to the size of the objects to be extracted. The valuation of both classes of filters is done by two criteria: homogeneity and connectivity. The first class of filters is devoted to the extraction of thin features. In this case, the various filters operate within an elementary neighborhood. The filters belonging to the second class enable the extraction of larger elements. These filters are alternated sequential filters obtained by composition of morphological filters using structuring elements of increasing size. The comparison of the results provided by these filters, as well as the parameters quantifying homogeneity and connectivity, will allow the choice of the more accurate filter in order to ensure the extraction of features of various sizes on SAR-ERS1 images.