基于各向异性扩散的SAR图像斑点噪声滤波算法

张良培, 王 毅, 李平湘

电子学报 ›› 2006, Vol. 34 ›› Issue (12) : 2250-2254.

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电子学报 ›› 2006, Vol. 34 ›› Issue (12) : 2250-2254.
论文

基于各向异性扩散的SAR图像斑点噪声滤波算法

  • 张良培, 王 毅, 李平湘
作者信息 +

The Filtering Algorithm for SAR Image Speckle Noise Based on Anisotropic Diffusion

  • ZHANG Liang-pei, WANG Yi, LI Ping-xiang
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文章历史 +

摘要

在SAR(Synthetic Aperture Radar)图像噪声抑制处理中,为了有效地保持图像边缘,作者在斑点噪声去除的各向异性扩散模型(SRAD模型)的基础上,提出了一个基于各向异性扩散的SAR图像斑点噪声滤波算法.该算法对应的扩散系数从理论上满足Charbonnier 等人提出的构造扩散系数准则,同时该算法能够通过对边缘直方图上累计百分比和相对信噪比阈值进行调节来得到一系列不同的滤波效果,从而满足不同的应用需求,如绘图、高分辨率或细节丰富的处理结果.实验结果表明,与传统的方法相比,该算法不论从噪声去除能力、边缘和纹理保持能力上,还是从视觉评价效果来看,都具有一定的优越性.

Abstract

In order to effectively preserve SAR image edges while filtering,the authors propose an anisotropic diffusion filtering algorithm for speckle noise based on speckle reduction anisotropic diffusion (SRAD) model.On one hand,it can be proved that the diffusion coefficient in the proposed algorithm theoretically satisfies the conditions for the design of diffusion coefficients presented by Charbonnier,et al;on the other hand,the proposed algorithm can achieve a series of different filtered results,through the simple adjustment of two parameters.One parameter is a threshold of the accumulative histogram in the edge image,and the other one is a threshold of the relative signal to noise ratio.And the algorithm is applicable in different applications,including mapping and applications in which fine details and high resolution are required.The experimental results show that the proposed algorithm has capabilities of efficiently filtering speckle noise and preserving edge and texture features.Moreover,it outperforms the four traditional filtering methods in speckle smoothing,edge and texture preservation and visual assessment.

关键词

各向异性扩散 / 斑点噪声去除 / SAR图像 / 扩散系数 / 滤波

Key words

anisotropic diffusion / speckle noise reduction / SAR(Synthetic Aperture Radar) image / diffusion coefficient / filtering algorithm

引用本文

导出引用
张良培, 王 毅, 李平湘. 基于各向异性扩散的SAR图像斑点噪声滤波算法[J]. 电子学报, 2006, 34(12): 2250-2254.
ZHANG Liang-pei, WANG Yi, LI Ping-xiang. The Filtering Algorithm for SAR Image Speckle Noise Based on Anisotropic Diffusion[J]. Acta Electronica Sinica, 2006, 34(12): 2250-2254.
中图分类号: TP751   

基金

国家重点基础研究发展规划 (973计划)项目 (No.2006CB701302); 国家自然科学基金 (No.40471088,No.40523005)
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