relation: http://eprints.imtlucca.it/2415/
title: K-WEB: Nonnegative dictionary learning for sparse image representations
creator: Bevilacqua, Marco
creator: Roumy, Aline
creator: Guillemot, Christine
creator: Alberi-Morel, Marie Line
subject: QA75 Electronic computers. Computer science
subject: Z665 Library Science. Information Science
description: This paper presents a new nonnegative dictionary learning method, to decompose an input data matrix into a dictionary of nonnegative atoms, and a representation matrix with a strict ℓ0-sparsity constraint. This constraint makes each input vector representable by a limited combination of atoms. The proposed method consists of two steps which are alternatively iterated: a sparse coding and a dictionary update stage. As for the dictionary update, an original method is proposed, which we call K-WEB, as it involves the computation of k WEighted Barycenters. The so designed algorithm is shown to outperform other methods in the literature that address the same learning problem, in different applications, and both with synthetic and “real” data, i.e. coming from natural images.
publisher: IEEE
date: 2013-09
type: Book Section
type: PeerReviewed
identifier:   Bevilacqua, Marco and Roumy, Aline and Guillemot, Christine and Alberi-Morel, Marie Line  K-WEB: Nonnegative dictionary learning for sparse image representations.   In:  Proceedings of the 20th IEEE International Conference on Image Processing (ICIP).   IEEE, pp. 146-150.       (2013)  
relation: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6738031&isnumber=6737993
relation: 10.1109/ICIP.2013.6738031