一种改进的提高SAR图像分辨率的偏微分方程方法  

An improved PDE method of bettering SAR image′s resolution

作　　者：刘县[1] 康宝生[1] 刘成[1] 

机构地区：[1]西北大学信息科学与技术学院,陕西西安710127

出　　处：《西北大学学报（自然科学版）》2012年第6期911-914,共4页Journal of Northwest University（Natural Science Edition）

基　　金：陕西省自然科学基金资助项目(2005A14)

摘　　要：目的提高SAR图像的分辨率,滤除噪声干扰。方法利用了P-M非线性扩散方程在提高SAR图像分辨率时既能滤除噪声又能很好保护边缘的优势,借鉴了边缘增强扩散方程能够增强图像边缘的特性,提出了一种将两种方法相结合的处理方式。结果得到了一种将2种方法相结合的混合模型。结论该方式既避免了P-M非线性扩散方程无法改善SAR图像边缘的缺陷,又回避了边缘增强扩散方程容易产生虚假条纹的劣势,使图像的整体分辨率得到了提高。Aim Improving the resolution of SAR images and removing the interference of noise. Methods An approach combining P_ M nonlinear diffusion equation and edge enhancing diffusion equation was proposed, which used P_ M nonlinear diffusion equation＇s advantages that remove the noise and protect images＇ edges at the same time and used edge enhancing diffusion equation＇s feature that can enhance the edge of images. Results A mixed model that combined P_ M nonlinear diffusion equation and edge enhancing diffusion equation was obtained. Con- clusion Experiments showed that this method avoid the disadvantage that P_ M nonlinear diffusion equation can＇t improve the edge of image and edge enhancing diffusion equation may produce line-like structure, the resolution of the whole image was improved.

关 键 词：SAR图像 分辨率 P-M非线性扩散方程 边缘增强扩散方程 梯度 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]