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基于自适应窗和形状自适应小波变换的SAR图像相干斑抑制

Keywords: SAR图像相干斑抑制,自适应窗,形状自适应小波变换,局部多项式近似-置信区间交叉,基于稀疏性的权值

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Abstract:

结合SAR图像空域的先验知识和小波域系数的特性,提出了一种新的SAR图像相干斑抑制算法.使用最近提出的局部多项式近似-置信区间交叉(localpolynomialapproximation-intersectionofconfidenceintervals(LPA-ICI))构造自适应窗,寻找到与SAR图像中每个像素点相对应的同质区域,在每个同质区域内利用本文给出的快速形状自适应小波变换进行硬阈值收缩抑斑,最后根据本文提出的稀疏加权方法融合多个估计样本获得最终抑斑图像.实验结果表明本文提出的算法有着很好的抑斑性能,尤其是在去除重构图像中的"振铃"效应以及有效保留原始SAR图像中的点目标方面性能更突出.

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