基于小波域中SOT结构的SAR相干斑抑制

Speckle reduction in SAR images based on the SOT structure in the wavelet domain

论述了在小波域中通过空间向树结构对合成孔径雷达(SAR)图像相干斑噪声的抑制。首先从SAR图像相干斑噪声产生的机理出发,论述了采用传统滤波方法去除SAR图像中相干斑噪声的局限性以及在小波变换域中如何通过空间向树结构对相干斑噪声进行有效的滤波;实验结果表明,此方法对SAR图像相干斑噪声有良好的抑制作用,同时还尽可能多保留目标的纹理细节。

This paper mainly deals with speckle reduction in SAR images based on the spatial orientation tree structure in the wavelet domain. The reason of generating speckles in SAR images is interpreted, and the disadvantages of speckle reduction based on conventional methods are discussed, and then it is expounded in detail how to filter the speckles by the spatial orientation tree（SOT） structure in the wavelet domain. Experiment results have shown that the performance of the filter is satisfactory in both reducing speckles and edge preservation.