Based On Ip Multicast Technology, Digital Network Video Surveillance System With

with the development of network technology ,communication technology and digital video technology , the video surveillance system go to the completely digital network time step by step. The thesis analyse some disadvantages of the existing system, which adopted broadcast communication and couldn't span multi-net-segment to surveille the scene from the long-distance. Just in such a background, we started to study the task of" digital network video surveillance system based on IP multicast".In the thesis, problem of "real-time performance and QoS of video transmission are addressed comprehensively. We set focus on resolving transmission protocol, through comparing TCP, UDP, RTP and RTCP and aiming at the characteristic of digital video surveillance system that many users would share video information in the same time, we designed two communication channels and choose different protocols, and then achieved by applying visual programming technology, so the performance of video transmission and quality of service are ensured, In the thesis, we emphasis on the IP multicast, software desgin and we also gave the resolving projects such as net structure , hardware composing and chooseing which network protocols.When we designed the system, we considered some key factors such as the system must deal with and store a great deal video and audio data, the capability of the hard disk in the server and client, hi the part of video compression, we choose the currently MPEG-4 video constringent card to complete the collecting and compression of the video and audio signals . hi the part of software design ,we research the whole structure of the surveillance software under the windows 2000 operation system, then import the object oriented ideas and choose the visual C++ as platform of software design. Wg combined the multithreading technique with the modularization and gave the flow charts of each module and the detailed realization for IP multicast, at the same time ,we present some kernel programme code in the appendix.The thesis did some useful work to accelerate the development of the real-time video surveillance system in the security field. The achievement had been used in thelab.