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Research on Speckle Filtering of Single-look SAR Image

Xu Xin; Liao Mingsheng; Zhu Pan; Pu Fangling (School of Photoelectric Engineering, WTUSM, 129 Luoyu Road, Wuhan, China, 430079)  
Since synthetic aperture radar (SAR) is a coherent system, images acquired by SAR are accompanied with speckle noise which disturbs image interpretation and target classification. This noise is conspicuous in single-look SAR images. Based on the analysis of the local speclke statistics charcteristics of single-look SAR image and algorithms of spatial filtering,an adaptive speckle fil tering method is presented in this paper. The Kuan filter which is based on MMSE criterion ismedified in the methed. One of the bol points of the algorithm is to find the set of pixels which belong to the same homogenoous area within filtering windows adaptively. The local relative standard deviation within filtering windows is und as the crucial paramter while a speial neighborhood model is used in the filtering window in order to che the largst homogneous area within filtering windows. Firstly the foral relative standard deviation Cx of filtering window is calculated.Then the filtering window is divided into eight mutually exclusive sub-window and the central pixel is the only repetitious pixel in each sub-window. For every sub-window, the local relative standard deviation Ci is calculated. If Cx is largr than a threshold Cu,the sub-window with the greatest Ci is removed from filtering window and Cx of remaining pixels in filtering window is recalculated. Repeat the procedure until CxCu. The remaining sub-window are meed as filtering area. The selected filtering area is the largest homogneous area in filtering window and the Kuan filtering algorithm is adopted within the filtering area. If all sub-window within filtering window are removed, reduce the size of window for the determination of homogeneous area. If the size of window is 3 by 3 pixels, replace the central pixel with the average of the neares four pixelsaround it. The methed is applied to several single-look ER-1/2 SAR images. The results show that the performance of the approach presented is satisfactory in both speckle filtering and the Preservation of image details, and in generating visually-natural images as well.
【Fund】: 国家自然科学基金;;测绘遥感信息工程国家重点实验室开放研究基金!69782001及WKL(98)2108
【CateGory Index】: TP751
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