Minimum Dispersion Constrained Nonnegative Matrix Factorization to Unmix Hyperspectral Data

Abstract : This paper considers the problem of unsupervised spectral unmixing for hyperspectral image analysis. Each observed pixel is assumed to be a noisy linear mixture of pure material spectra, namely endmembers. The mixing coefficients, usually called abundances, are constrained to positive and summed to unity. The proposed unmixing approach is based on the Non-negative Matrix Factorization (NMF) framework, which considers the physical constraints of the problem, including the positivity of the endmember spectra and abundances. However, the basic NMF formulation has degenerated solutions and suffers from non-convexity limitations.We consider here a regularization function, called dispersion, which favours the solution such that the endmember spectra have minimum variances. Such a solution encourages the recovered spectra to be flat, preserving the possible spectral singularities (peaks and sharp variations). The regularized criterion is minimized with a Projected Gradient (PG) scheme and we propose a new step-size estimation technique to fasten the PG convergence. The derived algorithm is called MiniDisCo, for Minimum Dispersion Constrained NMF. We experimentally compare MiniDisCo with recently proposed algorithms. It is shown to be particularly robust to the presence of flat spectra, to a possible a priori overestimation of the number of endmembers or if the amount of observed spectral pixels is low. In addition, experiments show that the considered regularization correctly overcomes the degeneracy and nonconvexity problems, leading to satisfactory unmixing accuracy. We include a comparative analysis of a real world scene.
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Alexis Huck, Mireille Guillaume, Jacques Blanc Talon. Minimum Dispersion Constrained Nonnegative Matrix Factorization to Unmix Hyperspectral Data. IEEE Transactions on Geoscience and Remote Sensing, Institute of Electrical and Electronics Engineers, 2010, 48 (6), pp.2590-2600. ⟨10.1109/TGRS.2009.2038483⟩. ⟨hal-01279698⟩



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