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基于小波域边缘方向特征的SAR图象噪声抑制方法

DOI: 10.11834/jig.200304154

Keywords: 计算机图象处理(520?6040),合成孔径雷达(SAR),斑点噪声,小波,边缘方向性

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Abstract:

给出了一种新的基于小波变换的合成孔径雷达(SAR)图象斑点噪声抑制方法.利用每一级小波分解得到的小波系数子带HL和LH,以及对原图进行水平方向旋转正负45°扫描后得到的另外两个正交方向的小波系数子带rcHL和raHL,可以判断出对应点边缘方向性的强弱,通过设定方向性阈值,确定该点是否位于边缘上,进而对没有位于边缘的点进行平滑,达到保留图象边缘的同时,抑制斑点噪声的目的.为解决对某些振荡型边缘的检测问题,还结合阈值法,对该方法做了改进.实验表明,与小波域的硬阈值或软阈值去噪方法相比,此方法在有效地抑制斑点噪声的同时,更好地保留了SAR图象中的边缘和纹理信息.

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