多视极化SAR图象相干斑抑制的研究
STUDY ON SPECKLE REDUCTION IN MULTI-LOOK POLARIMETRIC SAR IMAGE
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摘要: 本文研究多视极化合成孔径雷达(SAR)图象的相干斑抑制,提出多视极化白化滤波(MPWF)法,并进一步将它发展成具有多通道输出的全极化滤波器。本文还定量地分析了MPWF方法抑制相干斑的能力,并在理论上同全功率法、加权法和功率均衡法进行了比较。应用NASA/JPL机载L波段四视全极化SAR数据的试验结果验证了所提方法的有效性和优越性,也说明了MPWF处理能显著地提高SAR图象的分类精度。Abstract: This paper studies on the speckle reduction in multi-look polarimetric SAR image.A novel method,named the multi-look polarimetric whitening filtering (WPMF) method,is presented,and is further extended to construct a fully polarimetric filter with multi-channel output.The paper also quantifies the amount of speckle reduction achievable by using the MPWF,and compares this method with the span,weighting and power equalization (PE) methods in theory.Experimental results with the NASA/JPL L-band 4-look polarimetric SAR data demonstrate the effectiveness and superority of the MPWF,and show that the MPWF is of great advantage for enhancing SAR image classification.
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