物理学报Issue(17)：1-11,11.DOI:10.7498/aps.63.179502
一种抑制合成孔径雷达图像相干斑的各向异性扩散滤波方法
An anisotropic diffusion filtering metho d for sp eckle reduction of synthetic ap erture radar images
摘要
Abstract
An anisotropic diffusion filtering method is proposed to reduce multiplicative speckle noise in synthetic aperture radar images. A new anisotropic diffusion equation , which can effectively smooth speckles near the edges and reduce blocking artifacts in homogeneous regions, is established by embedding the mean curvature motion controlled by an adaptive coupling function into a traditional speckle reducing anisotropic diffusion equation. Moreover, a new direction-constrained diffusion function formed by combining the local directional ratios with the improved Frost filtering is introduced into the new anisotropic diffusion equation, so that it can further reduce blocking artifacts and obviously improve the edge distortion problem in the despeckled synthetic aperture radar images. Experimental results show that the proposed method can obviously reduce blocking artifacts, sufficiently smooth speckle noise in homogeneous regions and near the edges while preserving edges, and effectively improve the edge distortion problem. Visual quality and performance indexes of the despeckled images show that the proposed method outperforms several despeckling methods.关键词
相干斑抑制/各向异性扩散/方向约束/平均曲率运动Key words
speckle reduction/anisotropic diffusion/direction constraint/mean curvature motion引用本文复制引用
朱磊,韩天琪,水鹏朗,卫建华,顾梅花..一种抑制合成孔径雷达图像相干斑的各向异性扩散滤波方法[J].物理学报,2014,(17):1-11,11.基金项目
国家自然科学基金(批准号:61271295)和陕西省教育厅自然科学基金(批准号:14JK1303)资助的课题 （批准号:61271295）
