| 光谱学与光谱分析 |
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| Classification Technique for Hyperspectral Image Based on Subspace of Bands Feature Extraction and LS-SVM |
| GAO Heng-zhen, WAN Jian-wei, ZHU Zhen-zhen, WANG Li-bao, NIAN Yong-jian |
| School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China |
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Abstract The present paper proposes a novel hyperspectral image classification algorithm based on LS-SVM (least squares support vector machine). The LS-SVM uses the features extracted from subspace of bands (SOB). The maximum noise fraction (MNF) method is adopted as the feature extraction method. The spectral correlations of the hyperspectral image are used in order to divide the feature space into several SOBs. Then the MNF is used to extract characteristic features of the SOBs. The extracted features are combined into the feature vector for classification. So the strong bands correlation is avoided and the spectral redundancies are reduced. The LS-SVM classifier is adopted, which replaces inequality constraints in SVM by equality constraints. So the computation consumption is reduced and the learning performance is improved. The proposed method optimizes spectral information by feature extraction and reduces the spectral noise. The classifier performance is improved. Experimental results show the superiorities of the proposed algorithm.
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Received: 2010-11-05
Accepted: 2011-02-12
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Corresponding Authors:
GAO Heng-zhen
E-mail: gaohengzhen@gmail.com
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