title: Erratum to: Crowd behavior representation: an attribute-based approach.
abstract: [This corrects the article DOI: 10.1186/s40064-016-2786-0.].
authors.affiliation: Electrical Engineering Department, Hakim Sabzevari University, Sabzevar, Iran.
authors.forename: Hamidreza
authors.initials: H
authors.lastname: Rabiee
authors.affiliation: Biomedical Engineering Department, Hakim Sabzevari University, Sabzevar, Iran.
authors.forename: Javad
authors.initials: J
authors.lastname: Haddadnia
authors.affiliation: Pattern Analysis and Computer Vision Department (PAVIS), Istituto Italiano di Tecnologia, Genoa, Italy.
authors.forename: Hossein
authors.initials: H
authors.lastname: Mousavi
authors.affiliation: DISI, University of Trento, Trento, Italy.
authors.forename: Moin
authors.initials: M
authors.lastname: Nabi
authors.affiliation: Pattern Analysis and Computer Vision Department (PAVIS), Istituto Italiano di Tecnologia, Genoa, Italy.
authors.forename: Vittorio
authors.initials: V
authors.lastname: Murino
authors.affiliation: DISI, University of Trento, Trento, Italy.
authors.forename: Nicu
authors.initials: N
authors.lastname: Sebe