Noises Suppression of Radar Images of Directionlets Synthetic Aperture
Xiaowei Chen · Jisuanji fangzhen · 2011
To overcome the disadvantages that wavelets lack of the sensitivity to high-dimensional directional information and can not effectively preserve the edges,contours and textures in SAR images in speckle noise supperssion,in this paper we proposed a non-subsampled directionlets based denoising method.The directionlets that based on digital segments and integer grids theory can not only inherit the characteristics of dimension-dependable wavelets,but also obtain the flexible multi-directional characteristic by changing the directions of transform and sequences,so presents better performance in noise reduction of SAR images.Some experiments are taken and the results show that the proposed method can overcome the wavelet ringing and the edges blurring,and the numerical result also proves its efficiency.