| 基于非下采样Contourlet域局部高斯模型和MAP的SAR图像相干斑抑制 |
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| 引用本文： | 凤宏晓,侯彪,焦李成,卜晓明.基于非下采样Contourlet域局部高斯模型和MAP的SAR图像相干斑抑制[J].电子学报,2010,38(4):811-0816. |
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| 作者姓名： | 凤宏晓 侯彪 焦李成 卜晓明 |
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| 作者单位： | 西安电子科技大学智能信息处理研究所及智能感知与图像理解教育部重点实验室,陕西西安,710071 |
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| 基金项目： | 国家自然科学基金(No.60672126,60673097,60702062,60971128);;国家863高技术研究发展计划(No.2007AA12Z136,2008AA01Z125,2009AA12Z210);;国家973重点基础研究发展规划重点项目(No.2006CB705707) |
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| 摘 要： | 对SAR图像应用非对数加性模型，通过研究SAR图像中同质区域在非下采样Contourlet域的分布特性，提出对非下采样Contourlet域中、与同质区域相对应的平稳区域的非对数加性噪声使用高斯分布建模。基于该模型，利用局部滑动窗口和对非对数加性噪声方差的自适应估计，在最大后验准则的基础之上求得真实信号的非下采样Contourlet系数。由于未对图像进行对数变换，本文算法很好地保持了原始图像的辐射特性，相干斑被有效地抑制，均匀区域很少有伪吉布斯效应，同时边缘纹理清晰。无论视觉效果还是客观评价指标本文算法都优于许多现存的抑斑算法。
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| 关 键 词： | SAR图像抑斑 非下采样Contourlet变换 局部高斯模型 最大后验 |
SAR Image Despeckling Based on Local Gaussian Model and MAP in NSCT Domain |
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| FENG Hong-xiao,HOU Biao,JIAO Li-cheng,BU Xiao-ming.SAR Image Despeckling Based on Local Gaussian Model and MAP in NSCT Domain[J].Acta Electronica Sinica,2010,38(4):811-0816. |
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| Authors: | FENG Hong-xiao HOU Biao JIAO Li-cheng BU Xiao-ming |
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| Affiliation: | Institute of Intelligent Information Processing and Key Laboratory of Intelligent Perception and ImageUnderstanding of Ministry of Education;Xidian University;Xi'an;Shaanxi 710071;China |
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| Abstract: | Applying nonlogarithmic additive model for SAR image,the distribution characteristic of SAR image isotropic regions are researched in Nonsubsampled Contourlet Transform(NSCT) domain,and then Gaussian Model is proposed to model the nonlogarithmic additive noise of the isotropic region in NSCT domain.Based on this model,we apply local sliding windows and adaptively estimate the variation of the nonlogarithmic additive noise,and then the solution of real NSCT coefficient is determined by using Maximum a Poster... |
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| Keywords: | SAR image despeckling Nonsubsampled Contourlet Transform Local Gaussian Model maximum a posteriori |
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