Edge preservation evaluation of digital speckle filters

This paper makes three contributions. It clarifies the definition of edge preservation in SAR images. The definition of edge preservation is important for edge preservation evaluation of digital speckle filters. Only if the definition of edge preservation is reasonable, can the edge preservation evaluation be successfully performed. Second, an algorithm to evaluate edge preservation of digital speckle filters is proposed. Third, we analyze the reason why the enhanced Lee, enhanced Frost, gamma, and Kuan filters cannot effectively preserve edges. The main contribution in this paper is that we clarified the difference between edge preservation and edge point preservation. It is important to develop new methods to reduce speckle in SAR images, which can successfully preserve edges in smoothed images.