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Despeckling Synthetic Aperture Radar Imagery using the Contourlet Transform

A novel method of Synthetic Aperture Radar (SAR) image despeckling using the contourlet transform representation is presented. Justification for the use of the contourlet signal representation, originally developed for natural images, is given. Methods of evaluating the despeckling performance of various algorithms are provided. Finally, a comparison of performance of multilook processing, wavelet-based despeckling, contourlet- based despeckling, and contourlet-based despeckling with cycle spinning is provided for both simulated and actual SAR images. It is shown that the contourlet methods have better performance than multilook or wavelet methods.