Contourlet域中邻域窗最优阈值滤噪算法  

Denoising Algorithm with Neighboring Window Optimal Threshold in Contourlet Domain

作　　者：王晅[1] 张小景[1] 马进明[2] 

机构地区：[1]陕西师范大学物理学与信息技术学院,西安710062 [2]上海电力学院,上海200090

出　　处：《计算机工程》2010年第5期223-224,227,共3页Computer Engineering

基　　金：陕西省自然科学基金资助项目(2009JM8003);陕西师范大学研究生培养创新基金资助项目(2009CXS025)

摘　　要：提出一种基于Contourlet变换域的图像滤噪算法,对带噪图像进行多尺度、多方向的Contourlet分解,依据Contourlet变换域系数的估计损失期望最小化准则,在Contourlet域中得到各子带内邻域系数的滤噪最优阈值与最优窗口尺寸,利用Contourlet变换域系数的萎缩实现滤噪。仿真结果表明,与现有的Contourlet变换域图像滤噪算法相比,该算法能有效保护图像的细节和纹理,具有较好的视觉效果和较高的峰值信噪比。This paper proposes a novel image denoising algorithm based on Contourlet domain. By using Contourlet transform, the noised image is decomposed into a low frequency subband and a set of multiscale and multidirectional high frequency subbands. Optimal thresholds and neighbouring window sizes for each subband arc determined by minimizing the loss expectation of estimating Contourlet coefficients and image denoising is implemented via shrinkage of Contourlet coefficients. Simulation results show the superiority of the proposed method in den＇oising noise and preserving texture details compared with the existing methods and the proposed method yields better visual effect and higher PSNR as a result of considering dependencies of Contourlct neighborhood coefficients.

关 键 词：图像滤噪 CONTOURLET变换 STEIN估计 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]