| 基于小波变换和中值滤波相结合的SAR图像相干斑的抑制 |
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| 引用本文： | 詹胜,左振生.基于小波变换和中值滤波相结合的SAR图像相干斑的抑制[J].唐山师范学院学报,2009,31(2):89-92. |
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| 作者姓名： | 詹胜 左振生 |
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| 作者单位： | 1. 唐山师范学院,数学与信息科学系,河北,唐山,063000
2. 唐山师范学院,后勤管理处,河北,唐山,063000 |
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| 摘 要： | 合成孔径雷达图像中相干斑噪声的存在降低了图像的质量，影响了图像的解译和后续处理。分析了图像相干斑噪声产生的机理，介绍了基于空域和频域的滤波方法的研究现状，并在阐述小波阈值去噪声方法的基础上考虑根据小波系数子带分布特征用定向窗口中值滤波代替阈值去噪声，提出了结合中值滤波的小波域SAR相干斑抑制方法，并通过和已有的方法比较，说明该方法非常有效。
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| 关 键 词： | 合成孔径雷达 相干斑噪声 中值滤波 小波变换 |
The Speckle Reduction of SAR Based on Wavelet Transform and Median Filter |
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| ZHAN Sheng,CHEN Zhi-peng.The Speckle Reduction of SAR Based on Wavelet Transform and Median Filter[J].Journal of Tangshan Teachers College,2009,31(2):89-92. |
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| Authors: | ZHAN Sheng CHEN Zhi-peng |
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| Institution: | ZHAN Sheng, CHEN Zhi-peng (1. Department of Mathematics and Information Science, Tangshan Teachers College, Tangshan Hebei 063000, China; 2. Department of Logistics Administration, Tangshan Teachers College, Tangshan Hebei 063000, China) |
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| Abstract: | Speckle degrades the quality of Synthetic Aperture Radar （SAR） images and has an effect on interpretation of future analysis and processing for SAR images. Firstly speckle generative mechanism was analyzed and the the present method based on the spatial domain and frequency domain were introduced. Then for speckle reduction in wavelet domain median filter was selected in high frequency coefficients region windows, and the new method to correlate the median filter and wavelet transform was put forward. The experimental result has shown that the algorithm is valid to reduce SAR images speckle noise. |
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| Keywords: | SAR speckle reduction median filter wavelet transform |
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