Research On Some Key Technologies Of Video Surveillance

Video surveillance is playing an increasingly important role in the national economy. How to perform intelligent scene detection and to realize real-time & effective management of information are the core technologies of video surveillance.On the basis of analysis the structure and development of video surveillance technology, this paper researches on several key technologies involved in video surveillance, such as detection & analysis of anomaly, intelligent query, streaming transfer, etc., and complete the demonstration platform of video surveillance system.According to the practical requirements of engineering, this paper designs various algorithms, such as those for monitoring objects experiencing a slow change, updating backgrounds while rays are changing slowly, detection under changing background, elimination noise. This paper also advances the formula for evaluating the validity of these algorithms. After providing the analysis of the time, coordinates, size, track and so on of these anomalies, this paper designs an query system based on content of anomalous image, which reduces spending on system resource by means of extracting characteristics of image in Compressed-Domain, improves the accuracy of detection results by the 3-tier detection process designed, i.e. "coarse detection + scrutinized detection + classification", and provide a friendly interface. For the purpose of satisfying the requirements of real-time transfer, processing and play back in the video surveillance, this paper implement a kind of intranet streaming video transfer technology, including Csocket and DirectShow technology, the multithreading application and synchronized processing technology as well.Through researches on several key technologies involved in video surveillance, this paper carries out a helpful attempt to enhance functions of monitoring system and improve intelligent level of video surveillance system.