方向波合成孔径雷达图像噪声抑制  

Noises Suppression of Radar Images of Directionlets Synthetic Aperture

作　　者：张健[1] 陈孝威[1] 

机构地区：[1]贵州大学计算机科学与信息学院,贵州贵阳550025

出　　处：《计算机仿真》2011年第3期44-47,共4页Computer Simulation

基　　金：贵州省省长基金(黔省专合字(2007)14号)

摘　　要：关于提高孔径雷达图像质量,应研究雷达图像去噪问题,针对目前小波对高维信息的方向性不敏感,在合成孔径雷达图像斑点噪声抑制中不能很好的保留图像的边缘、轮廓与纹理信息的缺点,为提高图像质量,提出一种方向波的SAR图像斑点噪声抑制方法。根据数字化线段理论和整数栅格理论的方向波不仅继承了小波变换维数可分性的特点,而且通过选择变换方向和队列方向来获得灵活的多方向性进行仿真,从而能够更好的捕获图像方向信息,经实验证明,所提出的方法能够克服小波去噪中"振铃效应"和边缘模糊等现象,证明了方法有效性。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 direetionlets 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.

关 键 词：方向波 非下采样 整数栅格 合成孔径雷达图像 斑点噪声抑制 

分 类 号：TP951[自动化与计算机技术]