| 光谱学与光谱分析 |
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| Hyperspectral Remote Sensing Image Classification Based on SVM Optimized by Clonal Selection |
| LIU Qing-jie1, 2, JING Lin-hai1, 2, WANG Meng-fei3, LIN Qi-zhong1, 2 |
1. Center for Earth Observation and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China
2. Key Laboratory of Digital Earth, Chinese Academy of Sciences, Beijing 100094, China
3. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China |
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Abstract Model selection for support vector machine (SVM) involving kernel and the margin parameter values selection is usually time-consuming, impacts training efficiency of SVM model and final classification accuracies of SVM hyperspectral remote sensing image classifier greatly. Firstly, based on combinatorial optimization theory and cross-validation method, artificial immune clonal selection algorithm is introduced to the optimal selection of SVM (CSSVM) kernel parameter σ and margin parameter C to improve the training efficiency of SVM model. Then an experiment of classifying AVIRIS in India Pine site of USA was performed for testing the novel CSSVM, as well as a traditional SVM classifier with general Grid Searching cross-validation method (GSSVM) for comparison. And then, evaluation indexes including SVM model training time, classification overall accuracy (OA) and Kappa index of both CSSVM and GSSVM were all analyzed quantitatively. It is demonstrated that OA of CSSVM on test samples and whole image are 85.1% and 81.58, the differences from that of GSSVM are both within 0.08% respectively; And Kappa indexes reach 0.821 3 and 0.772 8, the differences from that of GSSVM are both within 0.001; While the ratio of model training time of CSSVM and GSSVM is between 1/6 and 1/10. Therefore, CSSVM is fast and accurate algorithm for hyperspectral image classification and is superior to GSSVM.
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Received: 2012-08-17
Accepted: 2012-11-20
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Corresponding Authors:
LIU Qing-jie
E-mail: qijliu@ceode.ac.cn
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