The Study Of Network Video Surveillance System And Congestion Control

This paper introduces the implementation of network video surveillance system and the study of Active queue management (AQM), the first part discuss the status quo and key technology of network video surveillance system nowadays, hardware structures and software design of each module is discussed in detail. This system adopt a type of better program mode, imports the newest network video program mode that ameliorated from DirectShow software architecture, Modularization and expandability of program is boost and quality of video is improved. Dynamic multi-thread has been used in many part of this system, it make the efficiency of this software improve remarkably. We are not save data in database but in INI file and LOG file, it can reduce cost of installation of system. RTP/RTCP protocol is used, it make the transmit of data more normative, the upgrade and maintenance of software will be easier in future.TCP/IP protocol can't ensure network transmit QOS (Quality of Service), but provide "better effort" service. Network Congestion is exist consequentially because the quantity of data been required to transmit is beyond the bottleneck bandwidth at present, so it is very important that congestion control mechanisms are used. Many result may been brought if unfit queue management algorithm used in management of queue in middle node, such as global synchronization, keep queue full long time and lock-out. It has become an important content of network congestion study what the study of active queue management. This paper analyzes study status quo and common algorithm of active queue management now in detail, analyzes its study trends in detail. I illation the Proportion and PI algorithm, implement its NS-2 simulation, and pose my opinion on their trait and control effect. I illation API and PPI algorithm, implement its NS-2 simulation, Simulation results are given to prove that the new AQM algorithm can control the queue effectively.