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Pattern Recognition, International Conference on (2010)
Istanbul, Turkey
Aug. 23, 2010 to Aug. 26, 2010
ISSN: 1051-4651
ISBN: 978-0-7695-4109-9
pp: 1011-1014
ABSTRACT
Large-scale geophysical monitoring systems raise the need for real-time feature extraction and signal classification. We study support vector machine (SVM) classification of hydroacoustic signals recorded by the Comprehensive Nuclear-Test-Ban Treaty's verification network. Due to constraints in the early signal processing most samples have incomplete feature sets with values missing not at random. We propose kernel functions explicitly incorporating Boolean representations of the missingness pattern through dedicated sub-kernels. For kernels with more than a few parameters, gradient-based model selection algorithms were employed. In the case of binary classification, an increase in classification accuracy as compared to baseline SVM and linear classifiers was observed. In the multi-class case we evaluated four different formulations of multi-class SVMs. Here, neither SVMs with standard nor with problem-specific kernels outperformed a baseline linear discriminant analysis.
INDEX TERMS
support vector machine, missing data, underwater sound, CTBTO, treaty verification
CITATION

C. Igel, M. Tuma and M. Prior, "Hydroacoustic Signal Classification Using Kernel Functions for Variable Feature Sets," 2010 20th International Conference on Pattern Recognition (ICPR 2010)(ICPR), Istanbul, 2010, pp. 1011-1014.
doi:10.1109/ICPR.2010.253
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