Video surveillance is an important part of the security prevention system, and it is a comprehensive system with stronger prevention ability. Video surveillance is widely used in many occasions for its intuitive, accurate, timely and informative characteristics. In recent years, with the rapid development of computers, networks, image processing and transmission technology, video surveillance technology has also made great progress. With the continuous development of video technology, video surveillance can currently be divided into two major categories: digital video surveillance systems and network monitoring.