Speckle Restraint of SAR Image Based on Wavelet Packets Decomposition
Hu Cheng Zhao, Gis La · Journal of Xuzhou Normal University · 2003
This paper describes an algorithm of speckle restraint for SAR image using wavelet packets decomposition and soft threshold theory. First, the SAR image is decomposed by wavelet packets,and the optimized wavelet bases are chosen in order to increase the difference between wavelet coefficients.Then,Donoho soft threshold theory is applied to restrain speckle of SAR image and a suitable threshold is selected. Last,SAR image after despeckling is reconstructed using wavelet packets reconstruction technique. The experimentation shows that the speckle is effectively restrained using the algorithm.