Polarimetric SAR Image Classification Based on Feature Enhanced Superpixel Hypergraph Neural Network

Abstract

Synthetic aperture radar (SAR) images can capture abundant spatial and polarimetric information of land cover objects, and thus polarimetric SAR (PolSAR) image classification has been developed for various applications. Combining the advantages of spatial and polarimetric information simultaneously is of great importance for PolSAR image classification. In this paper, a feature enhanced superpixel hypergraph neural network (FESHNN) is proposed for PolSAR image classification, which aims to take full advantage of spatial features and polarimetric features from PolSAR images. In the proposed model, superpixel hypergraph neural network is constructed for feature representation of superpixels, which aims to obtain spatial correlation and polarimetric correlation in a hypergraph. Then, a feature enhancement module is employed to refine the local features of pixels and the spatial features of superpixels, which aims to enhance the discrimination of feature representation. Experimental results on three PolSAR datasets demonstrate that the proposed method yields superior classification performance compared with other related approaches.