光学精密工程2017，Vol.25Issue(6)：1662-1668,7.DOI:10.3788/OPE.20172506.1662
改进的各向异性扩散方程的超声图像滤波方法
Improved speckle reducing anisotropic diffusion for ultrasound image filtering
摘要
Abstract
In order to eliminate the block effect and the blurring details of images caused by the traditional speckle reducing anisotropic diffusion,an improved anisotropic diffusion algorithm was proposed,in which a new diffusion coefficient constituted by the hyperbolic tangent function was used to replace the original diffusion coefficient,thus can wipe off the block effect in the uniform region of images.A damping factor was used to guide the speed of attenuation in the no-uniform area,thus reserving the details and the weak edges of images.In the meanwhile,the relative smooth increment was introduced to monitor the degree of filtering automatically,and could stop the iteration process of the partial differential equation adaptively.The experiments show that the proposed method can not only filter the speckle noises of the images effectively,but also eliminate the block effect problem lead by the traditional anisotropic diffusion.In addition,it can improve the ability of preserving the detail informations of images and enhance the structural similarity between the filtered images and the original images.关键词
超声图像/斑点噪声/各项异性扩散/图像滤波Key words
ultrasound image/speckle noise/anisotropic diffusion/image filtering分类
机械制造引用本文复制引用
许贤泽,赵文成,徐逢秋,刘盼盼..改进的各向异性扩散方程的超声图像滤波方法[J].光学精密工程,2017,25(6):1662-1668,7.基金项目
国家973重点基础研究资助项目(No.2011CB707904) （No.2011CB707904）
