多視極化SAR圖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: 本文研究多視極化合成孔徑雷達(dá)(SAR)圖象的相干斑抑制,提出多視極化白化濾波(MPWF)法,并進(jìn)一步將它發(fā)展成具有多通道輸出的全極化濾波器。本文還定量地分析了MPWF方法抑制相干斑的能力,并在理論上同全功率法、加權(quán)法和功率均衡法進(jìn)行了比較。應(yīng)用NASA/JPL機(jī)載L波段四視全極化SAR數(shù)據(jù)的試驗(yàn)結(jié)果驗(yàn)證了所提方法的有效性和優(yōu)越性,也說(shuō)明了MPWF處理能顯著地提高SAR圖象的分類精度。
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關(guān)鍵詞:
- 極化合成孔徑雷達(dá); 多視處理; 乘性相干斑模型; 相干斑抑制; 紋理; 分類
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. -
Zebker H A, van Zyl J J, Held D N. Imaging radar polarimetry from wave synthesis[J].J. Geophys. Res.1987, 92(131):683-701[2]Novak L M, Burl M C. Optimal speckle reduction in polarimetric SAR imagery. IEEE Trans. on AES, 1990, AES-26(2): 293-305.[3]Lee J S, Grunes M R, Mango S A. Speckle reduction in multi-frequency and multi-polarization SAR imagery. IEEE Trans. on GE, 1991, GE-29(1): 535-544.[4]Lee J S, Grunes M R, Kwok R. Classification of multi-look polarimetric SAR imagery based on complex Wishart distribution. Int. J. Remote Sensing, 1994, 15(11): 12299-2311.[5]Liu Guoqing, Huang Shunji, Torre A, Rubertone F. Statistical analysis of multi-look polarimetric SAR data. the European Symposium on Satellite Remote Sensing II, Paris, France: Sep. 1995, SPIE 2584: 212-223. -
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