Research And Realization On Several Key Issues Of Digital Video Surveillance System

Video Surveillance System is an integral part of security systems. Because of its convenience and rich information, it is widely used in many occasions. This thesis investigates several key issues of digital surveillance system, gives the solutions to every problem, and then relizes these solutions.How to use the computer network to transport video data is one of the most critical issues of building a video surveillance system. Compared with the traditional surveillance network, the computer network is cheap, efficient, and easy to maintain. But the principle of TCP/IP decides that the network can not provide a good QoS of transmission. Choosing the application protocol RTP/RTCP can effectively overcome these disadvantages, and make full use of network bandwith resources. It's a better solution of video transmission problems. This paper investigates the latest RFC3550 standard, and realizes the protocol library with C++ language. Then it sends a detailed description of the sending and receiving process of RTP/RTCP packet by using protocol library.The new generation of video codec H.264 standard has been a significant increase in performance and image quality. Its features make it very suitable for network video server-based storage and video applications. But the real-time transport protocol such as RTP does not define the payload format of H.264. So it needs other standard (RFC3984) to package the H.264 data. This paper investigates the RFC3984 standard, designs the packetization stategies, process and RTCP feedback control. It ensures the compatibility of the H.264 video transimission. At both ends of the transmission network are video encoding server and video storage&management server. Video storage&management server, which is responsible for data collection, classification, storage and search, is the core of background services. So it needs a good framework to ensure its performance and scalability. And it also needs a friendly interface to facilitate management of its user. This paper describes the design of the framework and module structure of video storage&management system, and provides the realization of its modules, including the GUI module, storage management module, video playback module, and so on.Along with the changing of requirement of users, video storage&management systems may need frequent adjustment, which includes the adjustment of interface, network configuration, database configuration, and even the change of function module. Each of the adjustments, which are aimed at re-editing the source code and re-compiling, will waste a lot of time and manpower. Enhancing the configurable can make adjustments without changing the source code in most occasions. It could also alleviate the pressure on system maintance. This paper designs an XML-based configuration solution which uses XML language to preserve the parameters of system to enhance the configurable. And then it gives the realization of analyzing, storing and modifying the configuration files.The tests show that the solutions of this thesis to the key issues of video surveillance system are feasible. And the relative software has good operating results.