Detection of atypical activities—A review

Abstract

Atypical activities are typically aberrations of scene entities (vehicles, human, animal activities, or environment) from normal behavior. Abnormal activities include eve-teasing, attacking, terrorist attack, harassment, robbery, unidentified objects, etc. The main aim of this paper is to detect abnormal activities in crowded places and to alert disabled people from these activities. Such “Atypical Activities” behavior typically translates to some kind of a problem like unidentified objects, harassments, robbery, etc. Atypical event discovery can be considered as coarse level video understanding, which sifts through peculiarities from typical examples. This paper gives a complete characterization of the detection of atypical activities writing into two stages.