一种改进的二维经验模态分解SAR图像噪声抑制方法

Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University(2013)

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Abstract
针对二维经验模态分解(bidimensional empirical mode decomposition,BEMD)算法在抑制SAR图像噪声的过程中造成的边界污染问题,提出了一种改进的BEMD图像去噪方法.该方法在对含噪SAR图像进行BEMD分解的过程中,首先,对极值点进行三角剖分,同时在插值时进行边界周期延拓;其次,对插值后的曲面再进行IMF分解;然后,对分解后的含噪IMF分量进行小波滤波处理;最后,重构图像,从而达到抑制边界污染和去除斑点噪声的目的.实验结果表明,此方法同传统BEMD方法相比,边界污染抑制效果明显,在有效抑制SAR图像噪声的同时,较好地保持了图像的边缘和细节信息.
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Key words
BEMD,Noise suppression,SAR image,Speckle noise
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