Principal Skewness Analysis: Algorithm and Its Application for Multispectral/Hyperspectral Images Indexing

被引:22
作者
Geng, Xiurui [1 ]
Ji, Luyan [1 ]
Sun, Kang [1 ]
机构
[1] Chinese Acad Sci, Inst Elect, Key Lab Technol Geospatial Informat Proc & Appl S, Beijing 100190, Peoples R China
关键词
Coskewness tensor; independent components analysis (ICA); multispectral/hyperspectral data; INDEPENDENT COMPONENT ANALYSIS; PROJECTION PURSUIT; HYPERSPECTRAL DATA; DIMENSIONALITY REDUCTION;
D O I
10.1109/LGRS.2014.2311168
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
In this letter, we present a new feature extraction approach based on third-order statistics (coskewness tensor) called principal skewness analysis (PSA). PSA is the natural extension of principal components analysis from second-order statistics to third-order statistics. The result of PSA is equivalent to that of FastICA when skewness is considered as a non-Gaussian index. Similar to FastICA, PSA also applies the fixed-point method to search the skewness extreme directions. However, when calculating the new projected direction in each iteration, PSA only requires a coskewness tensor, whereas FastICA requires all the pixels to be involved. Therefore, PSA has an advantage over FastICA in speed.
引用
收藏
页码:1821 / 1825
页数:5
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