title: [An improved N-FINDR endmember extraction algorithm based on manifold learning and spatial information].
abstract: An improved N-FINDR endmember extraction algorithm by combining manifold learning and spatial information is presented under nonlinear mixing assumptions. Firstly, adaptive local tangent space alignment is adapted to seek potential intrinsic low-dimensional structures of hyperspectral high-diemensional data and reduce original data into a low-dimensional space. Secondly, spatial preprocessing is used by enhancing each pixel vector in spatially homogeneous areas, according to the continuity of spatial distribution of the materials. Finally, endmembers are extracted by looking for the largest simplex volume. The proposed method can increase the precision of endmember extraction by solving the nonlinearity of hyperspectral data and taking advantage of spatial information. Experimental results on simulated and real hyperspectral data demonstrate that the proposed approach outperformed the geodesic simplex volume maximization (GSVM), vertex component analysis (VCA) and spatial preprocessing N-FINDR method (SPPNFINDR).
authors.affiliation: Key Laboratory of Photoelectronic Imaging Technology and System, Ministry of Education, Beijing Institute of Technology, Beijing 100081, China. tangxy97@sina.com
authors.forename: Xiao-yan
authors.initials: XY
authors.lastname: Tang
authors.affiliation: Key Laboratory of Photoelectronic Imaging Technology and System, Ministry of Education, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Gao
authors.affiliation: Key Laboratory of Photoelectronic Imaging Technology and System, Ministry of Education, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Guo-qiang
authors.initials: GQ
authors.lastname: Ni
authors.affiliation: Key Laboratory of Photoelectronic Imaging Technology and System, Ministry of Education, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Zhen-yu
authors.initials: ZY
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Photoelectronic Imaging Technology and System, Ministry of Education, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Hao-bo
authors.initials: HB
authors.lastname: Cheng