魏志强^1,,,
毕海霞²
1.西安电子工程研究所 ??西安 ??710100
2.西安交通大学电子与信息工程学院 ??西安 ??710049

详细信息

作者简介:魏志强：男，1974年生，博士，研究员，研究方向为雷达系统工程、图像处理和太赫兹技术
毕海霞：女，1982年生，博士，高级工程师，研究方向为机器学习、遥感图像处理、大数据处理和通信技术

通讯作者:魏志强　 zqwei@fudan.edu.cn

中图分类号:TP75

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被引次数:0

出版历程

收稿日期:2018-03-09
修回日期:2018-08-22
网络出版日期:2018-08-29
刊出日期:2018-12-01

PolSAR Image Classification Based on Discriminative Clustering

Zhiqiang WEI^1,,,
Haixia BI²
1. Xi’an Electronic Engineering Research Institute, Xi’an 710100, China
2. School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China


摘要
摘要:该文提出一种基于判别式聚类框架的非监督极化SAR图像分类算法，利用判别式监督分类技术实现非监督聚类。为实现该算法，定义了一个结合softmax回归模型和马尔科夫随机场光滑性约束的能量函数。该模型中，像素类标和分类器均为需要优化的未知变量。该算法从基于${H / {\bar \alpha }}$目标极化分解和K-Wishart极化统计分布而产生的初始化类标开始，交替迭代优化分类器和类标的能量函数，从而实现对分类器和类标的求解。真实极化SAR数据上的实验结果证明了该算法的有效性和先进性。
关键词:极化SAR图像分类/
判别式聚类/
马尔科夫随机场/
softmax回归模型
Abstract:This paper presents a novel unsupervised image classification method for Polarimetric Synthetic Aperture Radar (PolSAR) data. The proposed method is based on a discriminative clustering framework that explicitly relies on a discriminative supervised classification technique to perform unsupervised clustering. To implement this idea, an energy function is designed for unsupervised PolSAR image classification by combining a supervised Softmax Regression (SR) model with a Markov Random Field (MRF) smoothness constraint. In this model, both the pixelwise class labels and classifiers are taken as unknown variables to be optimized. Starting from the initialized class labels generated by Cloude-Pottier decomposition and K-Wishart distribution hypothesis, the classifiers and class labels are iteratively optimized by alternately minimizing the energy function with respect to them. Finally, the optimized class labels are taken as the classification result, and the classifiers for different classes are also derived as a side effect. This approach is applied to real PolSAR benchmark data. Extensive experiments justify that the proposed approach can effectively classify the PolSAR image in an unsupervised way and produce higher accuracies than the compared state-of-the-art methods.
Key words:Polarimetric Synthetic Aperture Radar (PolSAR) image classification/
Discriminative clustering/
Markov Random Field (MRF)/
Softmax Regression (SR) model



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