Unsupervised Hyperspectral Embedding by Learning a Deep Regression Network

This work presents a novel hyperspectral embedding technique by learning a deep regression network in an unsupervised fashion, which aims at reducing the computational complexity and storage-costing of traditional manifold embedding methods as well as improving the representation ability of spectral signatures effectively. The proposed method attempts to learn an explicit and unified nonlinear mapping from all patch-wise correspondences of original hyperspectral data and dimension-reduced products generated by some existing manifold learning approaches. This process can be well performed by means of a deep regression model. The learned model is not only capable of locally capturing the manifold structure of the whole hyperspectral image from densely patch-based random sampling but also better applicable to high-efficient out-of-sample inference. Experimental results conducted on the real hyperspectral data demonstrate the effectiveness and superiority of the proposed hyperspectral embedding technique.