Spatial-Aware Dictionary Learning for Hyperspectral Image Classification

TitleSpatial-Aware Dictionary Learning for Hyperspectral Image Classification
Publication TypeJournal Article
Year of Publication2015
AuthorsSoltani-Farani, A., H. R. Rabiee, and S. A. Hosseini
JournalIEEE Transactions on Geoscience and Remote Sensing
Start Page527
Date Published01/2015
ISSNPrint ISSN: 0196-2892----Online ISSN: 1558-0644
Accession Number14513354
KeywordsClassification, dictionary learning, hyperspectral imagery, linear support vector machines, probabilistic joint sparse model
AbstractThis paper presents a structured dictionary-based model for hyperspectral data that incorporates both spectral and contextual characteristics of spectral samples. The idea is to partition the pixels of a hyperspectral image into a number of spatial neighborhoods called contextual groups and to model the pixels inside a group as members of a common subspace. That is, each pixel is represented using a linear combination of a few dictionary elements learned from the data, but since pixels inside a contextual group are often made up of the same materials, their linear combinations are constrained to use common elements from the dictionary. To this end, dictionary learning is carried out with a joint sparse regularizer to induce a common sparsity pattern in the sparse coefficients of a contextual group. The sparse coefficients are then used for classification using a linear SVM. Experimental results on a number of real hyperspectral images confirm the effectiveness of the proposed representation for hyperspectral image classification. Moreover, experiments with simulated multispectral data show that the proposed model is capable of finding representations that may effectively be used for classification of multispectral-resolution samples.
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