Journal
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
Volume 38, Issue 5, Pages 2258-2269Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/36.868883
Keywords
Bayesian inference; Gauss-Markov random fields (GMRFs); speckle noise; synthetic aperture radar (SAR); texture
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Basic textures as they appear, especially in high resolution SAR images, are affected by multiplicative speckle noise and should be preserved by despeckling algorithms. Sharp edges between different regions and strong scatterers also must be preserved. To despeckle images, we use a maximum a posteriori (MAP) estimation of the cross section, choosing between different prior models. The proposed approach uses a Gauss Markov random held (GMRF) model for textured areas and allows an adaptive neighborhood system for edge preservation between uniform areas. In order to obtain the best possible texture reconstruction, an expectation maximization algorithm is used to estimate the texture parameters that provide the highest evidence. Borders between homogeneous areas are detected with a stochastic region-growing algorithm, locally determining the neighborhood system of the Gauss Markov prior. Smoothed strong scatterers are found in the ratio image of the data and the filtering result and are replaced in the image. In this way, texture, edges between homogeneous regions, and strong scatterers are well reconstructed and preserved. Additionally, the estimated model parameters can be used for further image interpretation methods.
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