Feature extraction and classification of hyperspectral remote sensing image oriented to easy mixed-classified objects
(1.Department of Territory Information and Surveying Engineering, Xuzhou Normal University, Xuzhou 221009, China2.Shandong University of Science and Technology, Tai’an 271019,China3.Institute of Sintering & Pelletizing, Central South University of Technology, Changsha 410083, China)
Abstract: The classification of hyperspectral remote sensing data is an important problem theoretically and practically. With the increase of spectral bands, the separability of objects on remote sensing image should be improved. But the effects of traditional algorithm on feature extraction such as principal component analysis(PCA) is not so good for hyperspectral image. The key problem is that PCA can only represent the linear structure of data set; while the data clouds of different objects on hyperspectral image usually distribute on a nonlinear manifold. This paper established an algorithm of nonlinear feature extraction named as nonlinear principal poly lines, based on the algorithm, a classifier is constructed and the classification accuracy of hyperspectral image can be improved.
Key words: hyperspectral remote sensing； feature extraction； classification