| 单视数SAR图像Speckle滤波方法的研究 |
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| 引用本文： | 徐新,廖明生,朱攀,卜方玲.单视数SAR图像Speckle滤波方法的研究[J].武汉大学学报(信息科学版),1999,24(4):51. |
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| 作者姓名： | 徐新 廖明生 朱攀 卜方玲 |
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| 作者单位： | 武汉测绘科技大学光电工程学院,武汉市珞喻路129号,430079 |
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| 基金项目： | 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 |
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| 摘 要： | 在分析单机数SAR影像的Speckle局部统计特性和现有的空间滤波算法的基础上，提出了一种新的Speckle滤波方法，该方法采用特殊的滤波窗口邻域划分方法，根据窗口相对标准差自适应地调整窗口尺寸和窗口内的滤波区域。该方法被用于多幅单视数ERS-1/2SAR图像去Speckle处理，并与以往的典型算法进行了比较，取得了较好的实验结果。
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| 关 键 词： | 合成孔径雷达 斑点噪声 相对标准差 单视数 有效视数 |
| 修稿时间： | 1999-04-13 |
Research on Speckle Filtering of Single-look SAR Image |
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| Xu Xin,Liao Mingsheng,Zhu Pan,Pu Fangling.Research on Speckle Filtering of Single-look SAR Image[J].Geomatics and Information Science of Wuhan University,1999,24(4):51. |
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| Authors: | Xu Xin Liao Mingsheng Zhu Pan Pu Fangling |
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| Abstract: | 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 Cx
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| Keywords: | synthetic aperture radar speckle relative standard deviation single-look effective number of looks |
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