Hyperspectral image classification based on deep separable residual attention network

Abstract

Hyperspectral image have rich spatial and spectral information, and how to fully extract and utilize the features of these two dimensions is a research hotspot in hyperspectral classification methods. At present, the unique convolutional operation and deep feature extraction structure of convolutional neural network enable them to have stronger feature representation capabilities and achieve good results in hyperspectral image classification. However, CNN methods do not assign different weights based on the importance of features in the feature extraction process, making it difficult to effectively utilize key features, and most importantly, using fixed shaped convolution kernel can easily overlook the differences between hyperspectral image features. A hyperspectral image classification method based on deep separable residual attention network is proposed to address the above issues. Firstly, to reduce the correlation between hyperspectral image data and minimize the interference of redundant information, principal component analysis is used to reduce the dimensionality of hyperspectral image. Secondly, a shallow feature extraction module is constructed, which can dynamically adjust the size of the receptive field according to the actual situation of the image, adaptively extract shallow features, and reduce the loss of original image features. Then, a depthwise separable residual attention mechanism module is proposed, based on which features are extracted. Starting from global and local features, contextual information on image features in channel and spatial domains is extracted. Finally, use a multi-scale feature fusion module to fully integrate feature maps at different scales. Using Indian Pines, Pavia University and Botswana as experimental datasets, the overall classification accuracy of this paper's method is 98.47 %, 98.70 %, 98.83 % with only 50, 50, 30 training samples per class. The Kappa coefficient is 98.25 %, 98.27 %, and 98.73 %, respectively. Compared with advanced methods, this method not only has higher classification accuracy, but also fully utilizes key features at various network levels.