Optical Driven Nonlocal SAR Despeckling
We propose a new synthetic aperture radar (SAR) despeckling technique based on nonlocal filtering and driven by a coregistered optical image. A preliminary homogeneous versus heterogeneous classification of theimage is used to decide where the optical guide can be safely used, thus preventing any distortion of the SAR geometry.
Even in regions where the use of optical data is enabled, despeckling is carried out exclusively in the SAR domain, and the optical guide is used only to improve the predictor selection in nonlocal filtering and, hence, in the estimationprocess. Experiments on real-world imagery confirm the potential of the proposed approach.
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