Ms. Xiu-Man Huang Profile

Xiu-Man Huang

at National Taiwan Univ

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Proceedings Article | 15 October 2015 Paper

Modified wavelet kernel methods for hyperspectral image classification

Pai-Hui Hsu, Xiu-Man Huang

Proceedings Volume 9643, 96432C (2015) https://doi.org/10.1117/12.2194890

KEYWORDS: Wavelets, Hyperspectral imaging, Image classification, Discrete wavelet transforms, Remote sensing, Feature extraction, Continuous wavelet transforms, Earth sciences, Wavelet transforms, Image processing

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Hyperspectral images have the capability of acquiring images of earth surface with several hundred of spectral bands. Providing such abundant spectral data should increase the abilities in classifying land use/cover type. However, due to the high dimensionality of hyperspectral data, traditional classification methods are not suitable for hyperspectral data classification. The common method to solve this problem is dimensionality reduction by using feature extraction before classification. Kernel methods such as support vector machine (SVM) and multiple kernel learning (MKL) have been successfully applied to hyperspectral images classification. In kernel methods applications, the selection of kernel function plays an important role. The wavelet kernel with multidimensional wavelet functions can find the optimal approximation of data in feature space for classification. The SVM with wavelet kernels (called WSVM) have been also applied to hyperspectral data and improve classification accuracy. In this study, wavelet kernel method combined multiple kernel learning algorithm and wavelet kernels was proposed for hyperspectral image classification. After the appropriate selection of a linear combination of kernel functions, the hyperspectral data will be transformed to the wavelet feature space, which should have the optimal data distribution for kernel learning and classification. Finally, the proposed methods were compared with the existing methods. A real hyperspectral data set was used to analyze the performance of wavelet kernel method. According to the results the proposed wavelet kernel methods in this study have well performance, and would be an appropriate tool for hyperspectral image classification.

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