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A modified scattering model-based speckle filter (SMBSF) based on the spatial proximity principle was applied to the analysis of phased array type L-band synthetic aperture radar (PALSAR) polarimetric data in the coastal environment of North Carolina, USA. The modified filter preserved polarimetric characteristics and further reduced speckle noise qualitatively and quantitatively. Classification accuracy using the SAR data filtered by the modified filter was improved, especially for the forest class. [ABSTRACT FROM AUTHOR]

The problem of interferometric SAR (InSAR) image co-registration is addressed. Classical InSAR matching considers only the translation shift between two complex images. However, for accurate radar image matching (different swaths, paths, or aspects angles), other shift parameters would be useful. For two-dimensional images, the application of the Symmetric Phase Only Matching Filtering (SPOMF) to the Fourier-Mellin Invariant (FMI) descriptors allows an accurate and efficient registration of translated, rotated and scaled images. This paper discusses the utility and feasibility of the SPOMF technique on the FMI descriptors of two interferometric SAR images. The FMI-SPOMF technique is applied on different pairs of InSAR data corresponding to areas with different relief types, in France, Nepal and Tunisia. The results are compared with those of classical cross-correlation registration techniques. We find that the FMI-SPOMF descriptors of an interferometric pair of images allows more precise co-registration and moreover could decide on the exploitability of a given interferometric pair. [ABSTRACT FROM AUTHOR]

A filter for suppressing speckle in synthetic aperture radar (SAR) images utilizing wavelet is proposed. The filter suppresses speckle by reducing the amplitude of the detail images in wavelet subspaces, while preserving edges by releasing the amplitude reduction around edges; information on edges, contained in the detail images, is utilized for edge detection. Simulations and application to SAR images have shown that the performance of the filter is satisfactory in both smoothing and edge preservation, and in generating visually-natural images as well. [ABSTRACT FROM AUTHOR]