There commonly exists speckle noise in the SAR images. It badly disturbs the extraction and interpretation of the information of the objects, influences the application of the SAR images. So it has important meaning to reduce the speckle noise in the SAR images. In this paper, the mechanism and mathematical model of the speckle noise is firstly analyzed. Then the methods of filtering speckle noise is introduced, especially several local region adaptive filters. Two filter models are summarized to direct the construction of the new filter. Then for the typical filter, the contrast tests are carried out. At the last, it brings out a quantitative evaluation index to direct the filtering the speckle noise and the construction of the new filter.
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