Detection of Different Behavior from The Majority in A Public Space
Kohei Saito, Hiroshi Hanaizumi · 2017
A measurement method was proposed for observing movements of persons in a public space such as a railway station. The method was based on the fact that a person occupied a 3D region and his or her sequential images captured by a security camera formed a wormhole in the spatiotemporal image space. Direction of the majority of those wormholes was estimated as movement direction of the majority by a projection algorithm. After filling the majority wormholes, remaining ones were searched and recognized as different behavior persons. A high-accuracy person extraction algorithm was also developed for preventing wormholes enlargement mainly caused by persons’ shadow. An inter-frame difference technique was adopted for realizing the quick updating the background. The method was successfully applied to a security camera video for detecting different behaviors from the majority.