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Customizing kernel functions for SVM-based hyperspectral image classification

Guo, B., Gunn, S. R., Damper, R. I. and Nelson, J. D. B. (2008) Customizing kernel functions for SVM-based hyperspectral image classification IEEE Transactions on Image Processing, 17, (4), pp. 622-629. (doi:10.1109/TIP.2008.918955).

Record type: Article

Abstract

Previous research applying kernel methods such as support vector machines (SVMs) to hyperspectral image classification has achieved performance competitive with the best available algorithms. However, few efforts have been made to extend SVMs to cover the specific requirements of hyperspectral image classification, for example, by building tailor-made kernels. Observation of real-life spectral imagery from the AVIRIS hyperspectral sensor shows that the useful information for classification is not equally distributed across bands, which provides potential to enhance the SVM's performance through exploring different kernel functions. Spectrally weighted kernels are, therefore, proposed, and a set of particular weights is chosen by either optimizing an estimate of generalization error or evaluating each band's utility level. To assess the effectiveness of the proposed method, experiments are carried out on the publicly available 92AV3C dataset collected from the 220-dimensional AVIRIS hyperspectral sensor. Results indicate that the method is generally effective in improving performance: spectral weighting based on learning weights by gradient descent is found to be slightly better than an alternative method based on estimating ";relevance"; between band information and ground truth

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Published date: 2008
Organisations: Electronic & Software Systems, Southampton Wireless Group

Identifiers

Local EPrints ID: 265043
URI: http://eprints.soton.ac.uk/id/eprint/265043
ISSN: 1057-7149
PURE UUID: d3b59de0-2ee0-4ce8-9d3b-93dc2fbddb2d

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Date deposited: 17 Jan 2008 11:54
Last modified: 18 Jul 2017 07:29

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Contributors

Author: B. Guo
Author: S. R. Gunn
Author: R. I. Damper
Author: J. D. B. Nelson

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