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Spatial-spectral classification based on group sparse coding for hyperspectral image

In this paper, a novel hyperspectral image classification method is proposed, based on group sparse coding. The method is based on this acknowledgement that larger spatial variation exists in high spatial resolution hyperspectral image, which degrades the separability of hyperspectral image. In order to obtain a smooth representation, each pixel and its spatial neighbors are coded together by group sparse coding. Although nothing about class information is included, the neighbor pixels in a small spatial window are inclined to belong to the same class. Thus, that will reduce the within-class scatter and be favorable to the classification task. Then, the obtained sparse representation vectors are used for hyperspectral image classification with SVM. Experimental results show that our method exceeds the classical classification algorithms in accuracy and regional consistency.