sparse representation

This paper has been recommended for acceptance by ‘Louis ten Bosch’. ∗ Correspondingauthorat:CentrodeI+DenSe˜nales,SistemaseINteligenciaComputacional(SINC(i)),Dpto.Informática,FacultaddeIngeniería - Universidad Nacional del Litoral, CC217, Ciudad Universitaria, Paraje El Pozo, S3000 Santa Fe, Argentina. Tel.: +54 342 4575233; fax: +54 342 4575224. E-mail address: cmartinez@fich.unl.edu.ar (C. Martínez). 0885-2308/$ – see front matter © 2012 Elsevier Ltd. All rights reserved.