269 citations · 3k across the 82 of their papers we have counts for
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math.OC2017★ 6 cited
Spectral Unmixing with Multiple Dictionaries
Jeremy E. Cohen, Nicolas Gillis
Spectral unmixing aims at recovering the spectral signatures of materials, called endmembers, mixed in a hyperspectral or multispectral image, along with their abundances. A typica…
math.OC2017★ 14 cited
Algorithms for Positive Semidefinite Factorization
Arnaud Vandaele, François Glineur, Nicolas Gillis
This paper considers the problem of positive semidefinite factorization (PSD factorization), a generalization of exact nonnegative matrix factorization. Given an -by- nonnega…
math.OC2017★ 31 cited
Finding the nearest positive-real system
Nicolas Gillis, Punit Sharma
The notion of positive realness for linear time-invariant (LTI) dynamical systems, equivalent to passivity, is one of the oldest in system and control theory. In this paper, we con…