Semisupervised Dimension Reduction Based on Pairwise Constraint Propagation for Hyperspectral Images

This letter presents a semisupervised dimension reduction method based on pairwise constraint propagation (SSDR-PCP) for hyperspectral images (HSIs). SSDR-PCP first utilizes pairwise constraint propagation, which is based on the labeled samples and k-nearest neighbor graphs to obtain more similarity information. Then SSDR-PCP applies the obtained weak supervised information of the entire training data set to construct a new similarity matrix. At last, we embed the similarity matrix to local preserving projection to achieve dimension reduction by finding the optimal transformation matrix for HSIs. The experimental results demonstrate that SSDR-PCP achieves better performance than the previous methods on two HSIs.