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Structured Gaussian Components for Hyperspectral Image Classification

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2 Author(s)

The large number of bands in hyperspectral images leads to a large number of parameters to estimate. It has been argued in the literature that class-conditional distributions of hyperspectral images are non-Gaussian; thus, multiple components might be needed to describe the classes accurately. In this paper, we propose to represent the Gaussian components in the classifier with a smaller number of parameters by allowing some or all component distributions to share eigenstructure by decomposing the covariance matrix Sigmak of each of the k components into a product of three parameters, namely: 1) scalar lambdak measuring volume; 2) diagonal matrix Ak of normalized eigenvalues measuring shape; and 3) matrix of eigenvectors Dk measuring orientation. Any combination of these parameters can be common for any subset of the covariance matrices, allowing a flexible set of possible configurations that can be used to approximate the true covariance using fewer parameters. A simple bottom-up algorithm for searching for possible parameter-sharing models is developed. Experiments on three data sets were performed: one concerned with woodland classification and two on urban mapping. Results from these experiments indicate that the method outperforms conventional classifiers and performs comparably with state-of-the-art classifiers such as support vector machines

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IEEE Transactions on Geoscience and Remote Sensing  (Volume:44 ,  Issue: 11 )