计算机工程与应用Issue(18)：1-5,5.DOI:10.3778/j.issn.1002-8331.1303-0403
改进的P-M扩散方程在相干斑抑制中的应用
Application of improved P-M diffusion equation in speckle reducing
摘要
Abstract
The filter based on P-M diffusion equation directly has been proven to be efficient to the additive noise, but it often fails when facing the multiplicative noise(such as the SAR image speckle). A novel speckle reduction method based on improved P-M diffusion equation is presented. By discussing the influence of applying log transfer to speckle, the theoretical foundation of applying P-M diffusion equation to speckle reduction is provided. A new diffusion coefficients based on Tukey’s Biweight Estima-tor error norm by recurring to the relationship between robust statistics and P-M diffusion is built. Simultaneously, the nonlinear time-dependent cooling technique for gradient threshold is incorporated into the new diffusion coefficients. In the experiment, the method is proven good performance in reducing speckle noise and preserving edges and details at the same time. Moreover, the filtered SAR images look good.关键词
相干斑/对数变换/P-M扩散方程/稳健统计/梯度阈值Key words
speckle/log-transform/Perona-Malik(P-M)diffusion equation/robust statistics/gradient threshold分类
信息技术与安全科学引用本文复制引用
陈少波,侯建华,张华..改进的P-M扩散方程在相干斑抑制中的应用[J].计算机工程与应用,2013,(18):1-5,5.基金项目
国家自然科学基金（No.61201448）；湖北省自然科学基金（No.2011CHB043）；武汉市科技攻关项目（No.201212521825）；中南民族大学中央高校基本科研业务费专项资金项目（No.CZY10001）。 （）
