一種新的SAR圖像的相干斑濾波方法
A new method for speckle filtering of SAR images
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摘要: 該文分析了合成孔徑雷達(dá)(SAR)圖像中的相干斑(Speckle)的統(tǒng)計(jì)特性,基于小波變換(WT),提出了一種新的相干斑濾波方法,該方法將小波變換后的HH分量采用Lee濾波,對(duì)HG,GH和GG分量則利用恒虛警技術(shù)(CFAR),保留重要的目標(biāo)和邊緣,再將這四個(gè)分量進(jìn)行重構(gòu)。實(shí)驗(yàn)結(jié)果表明,該方法具有相當(dāng)良好的相干斑抑制性能,等效視數(shù)得以大幅度提高,并且能很好地保持原圖像的邊沿特征,其性能明顯優(yōu)于通常采用的Lee算法。
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關(guān)鍵詞:
- 合成孔徑雷達(dá); 相干斑; 濾彼; 小波變換; 等效視數(shù)
Abstract: This paper analyzes the statistics of speckle in SAR. And based on wavelet transform, this paper puts forwards a new method for speckle suppression. After wavelet transform, Lee filter is adopted for HH part and CFAR (Constant False Alarm Ratio) is used for HG, GH, HH. This method not only improves the ENL of images, but also keeps the important targets and edge. Compared with Lee algorithm that was generally used in SAR speckle filtering, this new method has the great advantage in speckle suppression and edge keeping. The experimental results prove the effectiveness of the method. -
M.Alberto,hnproved multilook techniques alpplied to SAR and SCANSAR imnages,IEEE Trans.on GRS.,1991,GRS-23(4),529-534.[2]J.S.Lee,A simple smoothing algorithm for synthetic aperture radar images,IEEE Trans.on Syst Man Cybern,1983,SMC-13(1),85-89.[3]J.S.Lee,Speckle suppression and analysis for synthetic alperture radar images,Opt Eng.,1986.25(5).636-643.[4]Yang Jinhao et al.,Speckle filtering for SAR images based on orthonormal wavelet transform.EUSAR,Germany,1996,151-154.[5]V.Zaitsev,Analysis of the speckle suppression algorithms based on the MAP aplproach,EUSAIR.Germany,1996,159-162.[6]S.Foucher et al.,Unsupervised multiscale speckle filtering,IEEE lint.Conference on Imagre Processing,1996,391-394.[7]李建平,小波分析與信號(hào)處理,重慶,重慶出版社,1997,282-300. -
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