基于加权合成核与三重Markov场的极化SAR图像分类方法

doi:10.3969/j.issn.0372-2112.2016.03.004

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摘要

马尔可夫随机场(Markov Random Field,MRF)广泛用于处理遥感图像的分类问题,然而MRF在构建极化合成孔径雷达(Synthetic Aperture Radar,SAR)图像模型时未考虑其非平稳特性且对初始分类较为敏感,为此本文提出了一种基于加权合成核与三重马尔可夫随机场(Triplet Markov Field,TMF)的极化SAR图像分类方法.该方法依据训练样本在特征空间上的距离,提出了加权合成核函数权重系数的自适应确定方法以提高初始分类的精度和普适性;为充分考虑极化SAR图像的非平稳统计特性,利用TMF对极化SAR图像进行统计建模以实现贝叶斯分类.实验结果表明,与基于MRF的极化SAR图像分类方法相比,本文所提方法可获得更高的分类精度和更平滑的同质区域分类结果,而且本文方法能更好地保持图像边缘信息.

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	宋婉莹
	李明
	张鹏
	吴艳
	贾璐
	刘高峰

关键词 ：极化合成孔径雷达, 图像分类, 加权合成核, 三重马尔可夫随机场, 支持向量机

Abstract：

Markov random field (MRF) is widely applied to remote sensing images classification.However,the MRF-based classification method does not take the nonstationarity properties of images into account when it models polarimetric synthetic aperture radar (PolSAR) images,and is sensitive to the initial classification.Therefore,this paper proposes a classification method of PolSAR image based on the weighted composite kernel and the triplet Markov field (TMF).Based on the distances between the features of training samples,we compute the kernel weights of the weighted composite kernel for improving the accuracy and popularity of the initial classification.Then,taking the nonstationarity properties of PolSAR images into consideration,the TMF is introduced to model the statistics of real PolSAR images to realize the Bayesian classification.Experiments indicate that the proposed method can obtain higher classification accuracy and smoother homogeneous areas than the MRF-based PolSAR image classification method.Moreover,the proposed method can get more accurate edge location.

Key words： polarimetric synthetic aperture radar (PolSAR) image classification weight composite kernel Triplet Markov Field (TMF) support vector machine (SVM)

收稿日期: 2014-07-15 出版日期: 2015-02-27

ZTFLH:

TN957.52

基金资助:

国家自然科学基金(No.61271297,No.61272281,No.61301284);博士学科点科研专项基金(No.20110203110001);国家部委预研基金(No.9140A07020913DZ01001,No.9140C010205140C01004)

通讯作者: 李明 E-mail: liming@xidian.edu.cn

作者简介: 宋婉莹 女,1988年生于山东聊城.现为西安电子科技大学雷达信号处理国家重点实验室博士研究生.研究方向为极化SAR图像处理、多传感器信息融合等. E-mail:wanyingsong@hotmail.com;

引用本文:

宋婉莹, 李明, 张鹏, 吴艳, 贾璐, 刘高峰. 基于加权合成核与三重Markov场的极化SAR图像分类方法[J]. 电子学报, 2016, 44(3): 520-526. SONG Wan-ying, LI Ming, ZHANG Peng, WU Yan, JIA Lu, LIU Gao-feng. A Classification Method of PolSAR Image Based on Weighted Composite Kernel and Triplet Markov Field. Chinese Journal of Electronics, 2016, 44(3): 520-526.

链接本文:

http://www.ejournal.org.cn/CN/10.3969/j.issn.0372-2112.2016.03.004 或 http://www.ejournal.org.cn/CN/Y2016/V44/I3/520

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