Abstract
Hyperspectral imagery including rich spectral information could be applied to detect and identify objects at a distance. In this paper, we concentrate on the surface material identification of interested objects within the domain of space object identification (SOI) and geological survey. One of the approaches is the unmixing analysis that identifies the components (called endmembers) in each pixel and estimates their corresponding fractional abundances, and then, we could obtain the space distributions of substances. To solve this problem, we present an approach in a semi-supervised fashion, by assuming that the measured spectrum is expressed in the form of linear combination of a number of pure spectral signatures in a spectral library and the fractional abundances are their weights. Thus, the abundances are sparse and we propose a sparse regression model to realize the sparse unmixing analysis. We apply random projection technique to accelerate the sparse unmixing process and use split Bregman iteration to optimize the objective function. Our algorithm is tested and compared with other classic algorithms by using simulated hyperspectral images and a real-world image.
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Acknowledgments
The work was supported by the National Natural Science Foundation of China under the Grants 61273245, 60975003 and 91120301, the 973 Program under the Grant 2010CB327904, the open funding project of State Key Laboratory of Virtual Reality Technology and Systems, Beihang University (Grant No. BUAA-VR-12KF-07), the Beijing Natural Science Foundation (Non-negative Component Analysis for Hyperspectral Imagery Unmixing) under the Grant 4112036, and Program for New Century Excellent Talents in University of Ministry of Education of China under the Grant NCET-11-0775.
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Shi, Z., Liu, L., Zhai, X. et al. Efficient sparse unmixing analysis for hyperspectral imagery based on random projection. Neural Comput & Applic 23, 2281–2293 (2013). https://doi.org/10.1007/s00521-012-1179-8
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DOI: https://doi.org/10.1007/s00521-012-1179-8