Despeckling SAR images using adaptive bandelet transform and Bayesian maximum a posteriori estimation
Qingwei Gao, Yanan Xu, Yixiang Lu, Weinian Zhong · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2009
Synthetic aperture radar (SAR) images are inherently affected by multiplicative speckle noise, which is due to the coherent nature of scattering phenomena. This paper presents a despeckling method for SAR images based on adaptive bandelet transform. Bayesian maximum a posteriori (MAP) estimation is applied to adaptive bandelet transform coefficients to achieve more satisfying results. The performances of adaptive bandelet transform and wavelet thresholding for despeckling SAR images are compared through an experiment. Experiment results clearly demonstrated the capability of the proposed scheme in SAR image speckle reduction especially for SAR images possessing detailed textures.