Introduction

Millions of surveillance cameras form the “visual perception network” that constantly observes the physical world and human society, becoming an important component of the global information infrastructure. Surveillance video has become the largest part of global big data, containing rich information and having great practical significance for intelligent analysis. Abnormal behavior detection techniques in video scenes are the core technology of intelligent monitoring systems, has already attracted widespread attention from both academia and industry and become an important research direction in the field of computer vision. It is precisely because of the broad application prospects of intelligent video surveillance systems that quite a number of technologically advanced countries around the world have carried out a large number of research projects in recent years.