Kernel-based methods for hyperspectral image classification

Gustau Camps‐Valls

doi:10.1109/TGRS.2005.846154

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Kernel-based methods for hyperspectral image classification

2005-06-01

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Gustau Camps‐Valls

Lorenzo Bruzzone

DOI：10.1109/TGRS.2005.846154

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Abstract

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This paper presents the framework of kernel-based methods in the context of hyperspectral image classification, illustrating from a general viewpoint the main characteristics of different kernel-based approaches and analyzing their properties in the hyperspectral domain. In particular, we assess performance of regularized radial basis function neural networks (Reg-RBFNN), standard support vector machines (SVMs), kernel Fisher discriminant (KFD) analysis, and regularized AdaBoost (Reg-AB). The novelty of this work consists in: 1) introducing Reg-RBFNN and Reg-AB for hyperspectral image classification; 2) comparing kernel-based methods by taking into account the peculiarities of hyperspectral images; and 3) clarifying their theoretical relationships. To these purposes, we focus on the accuracy of methods when working in noisy environments, high input dimension, and limited training sets. In addition, some other important issues are discussed, such as the sparsity of the solutions, the computational burden,,and the capability of the methods to provide outputs that can be directly interpreted as probabilities.

Keywords:

AdaBoost

feature space

hyperspectral classification

kernel-based methods

kernel Fisher discriminanit analysis

radial basis function neural networks

regularization

support vector machines