Spectral-Spatial Classification of Hyperspectral Images Using Label Dependence

Hyperspectral images are rich in both spectral information and spatial dependence information between pixels; however, hyperspectral images are characterized by the high dimensionality of small data sets and the spectral variance. Facing these problems, spatial dependence information as supplementary information is a relatively effective means to solve them. And the label dependence characteristic of hyperspectral images is excellent spatial dependence information. Therefore, to address the above issues, based on residual network and spatial information extractor(RAS), which is based on a residual network, pixel embedding(PE), and a spatial information extractor(SIE). At the stage of mining spectral information, we use the residual network to mine spectral features; At the stage of mining spatial information, we utilize the label dependency characteristic to feed the set of pixels containing the target pixels into PE. Then, a pixel vector with location information and self-defined dimensionality is obtained. Next, this vector is fed into our proposed SIE to mine the spatial dependency information. In multi-group ablation experiments, our proposed model achieves overall accuracy (OA) scores of 79.16% on the 5% Indian Pines test set, 90.82% on the 1% Pavia University test set, and 92.17% on the 1% Salinas test set. Especially, the experimental results demonstrate that the joint spectral-spatial approach is effective in improving the accuracy of hyperspectral image classification.