Journal of University of Chinese Academy of Sciences >
An improved anisotropic diffusion equation for SAR speckle reduction
Received date: 2010-03-24
Revised date: 2010-05-31
Online published: 2011-03-15
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
ZHANG Qiang , ZHANG Yi . An improved anisotropic diffusion equation for SAR speckle reduction[J]. Journal of University of Chinese Academy of Sciences, 2011 , 28(2) : 223 -227 . DOI: 10.7523/j.issn.2095-6134.2011.2.013
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