Speckle Reduction From SAR Images Based on Dual Tree Complex Wavelet Transform
Ying Li · Microelectronics & Computer · 2007
In this paper,a speckle reduction method for Synthetic Aperture Radar (SAR) images based on Dual Tree Complex Wavelet Transform (DTCWT) is proposed,for the DTCWT has approximate shift-invariant and good directional selectivity. It first presumes the probability distribution function for complex wavelet coefficients of the original nature image,and then applies MAP theory to estimate coefficients from the noisy wavelet coefficients. Filtered image can be derived after inversed DTCWT. Experimental results demonstrate that the proposed method has superior performance to several other denoising methods.