A Modified Locality-Preserving Projection Approach for Hyperspectral Image Classification

作者:Zhai, YG (Zhai, Yongguang)[ 1,2 ] ; Zhang, LF (Zhang, Lifu)[ 1 ] ; Wang, N (Wang, Nan)[ 1 ] ; Guo, Y (Guo, Yi)[ 3 ] ; Cen, Y (Cen, Yi)[ 1 ] ; Wu, TX (Wu, Taixia)[ 1 ] ; Tong, QX (Tong, Qingxi)[ 1 ]

IEEE GEOSCIENCE AND REMOTE SENSING LETTERS

卷: 13  期: 8  页: 1059-1063

DOI: 10.1109/LGRS.2016.2564993

出版年: AUG 2016

摘要

Locality-preserving projection (LPP) is a typical manifold-based dimensionality reduction (DR) method, which has been successfully applied to some pattern recognition tasks. However, LPP depends on an underlying adjacency graph, which has several problems when it is applied to hyperspectral image (HSI) processing. The adjacency graph is artificially created in advance, which may not be suitable for the following DR and classification. It is also difficult to determine an appropriate neighborhood size in graph construction. Additionally, only the information of local neighboring data points is considered in LPP, which is limited for improving classification accuracy. To address these problems, a modified version of the original LPP called MLPP is proposed for hyperspectral remote-sensing image classification. The idea is to select a different number of nearest neighbors for each data point adaptively and to focus on maximizing the distance between nonnearest neighboring points. This not only preserves the intrinsic geometric structure of the data but also increases the separability among ground objects with different spectral characteristics. Moreover, MLPP does not depend on any parameters or prior knowledge. Experiments on two real HSIs from different sensors demonstrate that MLPP is remarkably superior to other conventional DR methods in enhancing classification performance.

通讯作者地址: Zhai, YG (通讯作者)

Chinese Acad Sci, State Key Lab Remote Sensing Sci, Inst Remote Sensing & Digital Earth RADI, Beijing 100101, Peoples R China.

地址:

[ 1 ] Chinese Acad Sci, State Key Lab Remote Sensing Sci, Inst Remote Sensing & Digital Earth RADI, Beijing 100101, Peoples R China

[ 2 ] Inner Mongolia Agr Univ, Coll Water Conservancy & Civil Engn, Hohhot 010018, Peoples R China

[ 3 ] Univ Western Sydney, Sch Comp Engn & Math, Parramatta South Campus Penrith South, Richmond, NSW 2751, Australia