Optical Flow-Based Video Anomaly Detection Approaches

In comparison with the background subtraction methods introduced in the previous chapters which are more suitable to simple static scenes when the background remains fixed for a certain period of time, an optical flow method is introduced in this chapter for anomaly detection to achieve good recognition and localization performances for more dynamic and cluttered scenes. Not only can the optical flow algorithms be used to directly detect abnormal behaviors, it also can be used as a motion feature extraction method for other abnormal behavior detection methods. As an illustration, a number of ways to use optical flow for anomaly detection are described.