Discovering the Representative Subset with Low Redundancy for Hyperspectral Feature Selection

• Main Authors: Wenqiang Zhang, Xiaorun Li, Liaoying Zhao
• Format: Article
• Language: English
• Published: MDPI AG 2019-06-01
• Series: Remote Sensing
• Subjects: unsupervised feature selection; dimensionality reduction; hyperspectral image; orthogonal projection; evolutionary algorithm
• Online Access: https://www.mdpi.com/2072-4292/11/11/1341

In this paper, a novel unsupervised band selection (BS) criterion based on maximizing representativeness and minimizing redundancy (MRMR) is proposed for selecting a set of informative bands to represent the whole hyperspectral image cube. The new selection criterion is denoted as the MRMR selection criterion and the associated BS method is denoted as the MRMR method. The MRMR selection criterion can evaluate the band subset’s representativeness and redundancy simultaneously. For one band subset, its representativeness is estimated by using orthogonal projection (OP) and its redundancy is measured by the average of the Pearson correlation coefficients among the bands in this subset. To find the satisfactory subset, an effective evolutionary algorithm, i.e., the immune clone selection (ICS) algorithm, is applied as the subset searching strategy. Moreover, we further introduce two effective tricks to simplify the computation of the representativeness metric, thus the computational complexity of the proposed method is reduced significantly. Experimental results on different real-world datasets demonstrate that the proposed method is very effective and its selected bands can obtain good classification performances in practice.