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14 March 2003 Wavelet-based filter for SAR speckle reduction and the comparative evaluation on its performance
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Speckle noise is a common phenomenon in SAR images. The reduction of Speckle is necessary for any further processing of SAR image such as segmentation, classification and other procedures for information extraction. In this paper, after a brief review of conventional filters for SAR speckle reduction, a wavelet-based soft-thresholding filter for SAR speckle reduction is presented. To evaluate the performance of this filter, the adaptive local statistics filters, which include Lee, Frost, Enhanced Lee, Enhanced Frost, Kuan, and the Gamma-Map filter are applied to the speckle reduction for a same typical SAR image. The performances are compared in several aspects including Radiometric preservation, feature preservation, speckle reduction in extended uniform regions and the absence of artifacts. The results show that the wavelet-based speckle reduction filter performs better in every aspect in evaluation than the conventional filters do.
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Yanchen Bo, Jinfeng Wang, Caiying Zhu, and Yong Ge "Wavelet-based filter for SAR speckle reduction and the comparative evaluation on its performance", Proc. SPIE 4886, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology II, (14 March 2003);

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