Wavelet packet-based nonlinear speckle reduction in optical synthetic aperture radar image analysis
Khan M. Iftekharuddin, Theresa A. Tuthill · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1996
A new technique for efficient speckle reduction in synthetic aperture radar (SAR) images using wavelet packets is proposed. A phenomenological approach is used in adapting the wavelet packet transform to minimize the speckle coefficients. With thresholding and averaging, the resulting non-linear, multirate filtering can be used to preprocess images for reduction of speckle while retaining contrast in key objects necessary for target classification. An example of the algorithm using a SAR image is provided.