期刊
IEEE TRANSACTIONS ON IMAGE PROCESSING
卷 23, 期 6, 页码 2663-2675出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIP.2014.2314022
关键词
Hyperspectral imagery; unsupervised spectral unmixing; Hamiltonian Monte Carlo; post-nonlinear model
资金
- HYPANEMA ANR Project [ANR-12-BS03-003]
- Thematic Trimester on Image Processing of the CIMI Labex, Toulouse, France [ANR-11-LABX-0040-CIMI, ANR-11-IDEX-0002-02]
- French Ministry of Defence
This paper presents a nonlinear mixing model for hyperspectral image unmixing. The proposed model assumes that the pixel reflectances are post-nonlinear functions of unknown pure spectral components contaminated by an additive white Gaussian noise. These nonlinear functions are approximated using second-order polynomials leading to a polynomial post-nonlinear mixing model. A Bayesian algorithm is proposed to estimate the parameters involved in the model yielding an unsupervised nonlinear unmixing algorithm. Due to the large number of parameters to be estimated, an efficient Hamiltonian Monte Carlo algorithm is investigated. The classical leapfrog steps of this algorithm are modified to handle the parameter constraints. The performance of the unmixing strategy, including convergence and parameter tuning, is first evaluated on synthetic data. Simulations conducted with real data finally show the accuracy of the proposed unmixing strategy for the analysis of hyperspectral images.
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