收稿日期: 2010-03-24
修回日期: 2010-05-31
网络出版日期: 2011-03-15
An improved anisotropic diffusion equation for SAR speckle reduction
Received date: 2010-03-24
Revised date: 2010-05-31
Online published: 2011-03-15
张强 , 张毅 . 一种用修正各向异性扩散方程抑制SAR相干斑的算法[J]. 中国科学院大学学报, 2011 , 28(2) : 223 -227 . DOI: 10.7523/j.issn.2095-6134.2011.2.013
In using anisotropic diffusion equation to reduce SAR image speckles, a number of iterations are needed, which makes it impossible to deal with real-time processing. To solve this problem, an improved algorithm is presented in the paper. Weights of the central pixel and all the direction diffusion coefficients are adaptively adjusted according to image differential coefficients of variation. Diffusion process is accelerated in the homogeneous region, while performance remains in inhomogeneous region. Airborne SAR image was used to verify the effectiveness of the approach. Less iterations are needed in the improved method than in the normal method.
Key words： SAR image; speckle; filter; anisotropic diffusion equation
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