| ASAR斑点噪声模型验证及噪声滤除效果评价 |
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| 引用本文： | 王军战,张友静,鲍艳松.ASAR斑点噪声模型验证及噪声滤除效果评价[J].地球信息科学,2008,10(2):183-189. |
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| 作者姓名： | 王军战 张友静 鲍艳松 |
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| 作者单位： | 1. 河海大学水文水资源及水利工程国家重点实验室, 南京 210098;
2. 河海大学土木工程学院, 南京 210098;
3. 南京信息工程大学, 南京 210044 |
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| 摘 要： | ASAR合成孔径雷达数据因影像中相干斑点噪声的存在,影响了地物信息定量的提取与应用效果。本文结合雷达信号传输理论,推导出适于ASAR多视图像的功率概率分布。并从理论推导和试验两方面证实了ASAR影像符合乘性噪声模型。利用乘性噪声模型的滤波算法,采用不同滤波器和不同大小窗口对ASAR影像的斑点噪声进行了滤除,并用平滑指数、边缘保持指数等因子对滤除结果进行评价,通过对比发现:7×7窗口的Enhanced Lee滤波的效果最好。
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| 关 键 词： | ASAR 乘性斑点噪声模型 滤波 滤除效果评价 |
| 收稿时间： | 2008-01-26; |
Validation Model of ASAR Speckle Noise and Evaluation Effect of Speckle Noise Filtering |
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| WANG Junzhan,ZHANG Youjing,BAO Yansong.Validation Model of ASAR Speckle Noise and Evaluation Effect of Speckle Noise Filtering[J].Geo-information Science,2008,10(2):183-189. |
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| Authors: | WANG Junzhan ZHANG Youjing BAO Yansong |
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| Institution: | 1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;
2. School of Civil Engineering, Hohai University, Nanjing 210098, China;
3. Nanjing University of Information Science & Technology, Nanjing 210044, China |
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| Abstract: | The existence of speckle noise on the ASAR(Advanced Synthetic Aperture Radar) images has exerted passive effect on the extraction of any quantitative information from the ASAR images,hence making the ASAR images ineffectively utilized.In this paper,based on radar signal transmission theory,the power probability distributing function of ASAR is deduced.For the multiplying noise model,it is validated by theoretic deduction and experiment data.Based on the noise model,different methods and filtering windows are used to reduce the noise.Comparing each filtering result with smooth index,edge keep index and so on,it is found out that the best effect is 7 pixel ×7 pixel of the Enhanced Lee filtering method. |
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| Keywords: | ASAR multiplying noise model filtering evaluation the effect of speckle noise filtering |
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