A survey on computer vision tools for action recognition, crowd surveillance and suspect retrieval

This paper briefly surveys computer vision tools that can be used on surveillance videos for crowd monitoring in order to detect anomalous events and retrieve suspects. Focus is given to methods for action recognition and event detection. (a) Satellite image, indicating the location of the event. c ©Igonográfico, Globo. (b) Still image from the surveillance camera that captured a flying toilet. c ©Diário de Pernanbuco. (c) Crime scene with a shattered toilet seat. c ©Carlos Ezequiel Vannoni/Agência JCM/Fotoarena, Folha de São Paulo. (d) Suspect arrested in less than 72hs with support from the community, thanks to a reward offered for helpful leads. c ©Lucas Liausu, Globo. Figure 1. In May 2014, hooligans dropped a toilet from the top deck of a stadium onto the street below, where it struck and killed a supporter of the rival team in Recife, Brazil.