Speckle Suppression Method in SAR image Based on Curvelet Domain BivaShrink Model

Based on the statistical property of SAR image speckle noise and the property that the multiscale geometric analysis can capture the intrinsic geometrical structure of image, combining curvelet transform with BivaShrink denoising model, a method of SAR image denoising based on curvelet domain is presented in this paper. According to calculation of variance homogeneous measurement and curvelet coefficients of current layer and its parent layer, the local adaptive window is determined to optimally estimate shrinkage factor. The method can effectively reduce SAR speckle noise and preserving details of SAR image well through the correlation of curvelet coefficients in the same direction of subband and parent-layer subband. The experimental results show the presented method greatly improves the subjective visual effect and the numerical indicators of the denoised image.