Design And Implementation Of Video Monitoring System In Narrowband Network Environment

With the development of economy and the improvement of people’s living standard, the security concept has been gradually integrated into all walks of life and people’s daily life. In the promotion of science and technology progress, security system has changed turn the world upside down change, from the initial to cable based analog video surveillance system in DVR(digital video recorder) digital video monitoring system based on, and then to today commonly used in network DVR based IP video monitoring system. Video monitoring system is developing towards digital, network development, the stability and the sharpness of the image has a higher requirement. In the monitoring field has rich products in the broadband network and the network, however, the narrow bandwidth product is scanty, in view of this, this paper designed a set of video surveillance system can adapt to the narrow bandwidth of network environment.The video server this topic research GRAINMEDIA technology GM8180 SoC based on H.264 code, with the powerful engine of CPU and dedicated, embedded Linux operation height of cutting, and the platform server uses TCP interactive link with the heartbeat mechanism to ensure reliable signaling interaction. Using H.264 video compression algorithm with frame extraction technology, to reduce unnecessary data transmission. Audio data using the ADPCM audio compression algorithm to obtain better quality and less consumption of resources within multiple CPU case. Using the transmission strategy specially designed, to increase the bandwidth utilization, thereby enhancing the transmission capacity.The system architecture based on distributed system architecture, which can effectively balance the load between the monitoring center and the monitoring center, a single failure does not affect the whole system. At the same time, a reference to the design of the system architecture design of TCP/IP five layer model, on the whole, the system is divided into 3 levels: terminal access layer, communication layer, application layer. The application layer using the modular design principle, communication, media except core forwarding, distribution, other business module can free split, combination, full of flexibility.This paper introduces the background and significance of research, the development of video monitoring system and video server. Discusses some key technique of monitoring system in the development of the system, including video interface technology, algorithm, audio compression algorithm, transmission protocol. The function and technical parameters of the video server and software platform to do some requirements, and overall design of the system separately from the system application scenarios, core video server, system three aspects to make the description. This paper mainly introduces the realization of the principle of video server, the key chip, hardware, software, and then introduces the realization of system platform, and the platform software. The final test results of the system design, analysis, summary and Prospect on test results.