introduction Video surveillance is an important part of the security defense system, it is a comprehensive system with strong defense capabilities. The digitization of video surveillance should first of all change the information flow (including video, audio, control, etc.) in the system from an analog state to a digital state, which will completely break the structure of "the classic CCTV system is centered on camera imaging technology" Change the way and structure of video surveillance system from information collection, data processing, transmission, system control, etc. The digitization of information flow, encoding compression, and open protocols enable seamless connection between the intelligent network video surveillance system and various subsystems in the security system, as well as management and control on a unified operating platform. This is system integration. meaning. 2 System architecture The transmission of 3G wireless video server adopts 3G network, which integrates the functions of video server. The wireless video server processes the video signal and other sensor signals, transmits it to the Internet through the 3G network, and finally transmits it to the video center. If mobile phone monitoring is required, it is forwarded to the mobile phone. Its typical architecture is shown in Figure 1. Figure 1 System architecture 3 Advantages of 3G wireless video server 3.1 Flexibility It is not subject to fixed network topology or system construction, and enjoys greater convenience in the addition and movement of equipment. 3.2 Easy installation No need to lay lines, saving a lot of manpower and material resources. 3.3 Wide range of video surveillance With the continuous expansion of the application range of image information management systems, users have higher and higher requirements for obtaining image information, hoping to do it anytime, anywhere. Such as: public security organs use the "mobile image transmission system" to conduct real-time monitoring and wireless transmission of video on the spot when temporary or sudden public security and security incidents occur; the traffic police use mobile terminals to keep abreast of the conditions of various traffic intersections; office workers Busy work, but also need to monitor home safety, babysitting care of children; company managers who go out want to easily and quickly understand the company's work and whether the production line or business premises are in normal operation. 3.4 Suitable for video surveillance at long distances and scattered locations When the monitored point is far away and scattered, the cost of using traditional network wiring is high, and only wireless video surveillance can be used. 3.5 Real-time monitoring of moving objects When monitoring mobile targets (such as buses, mobile emergency command vehicles, etc.), wireless video monitoring is required, and wired is impossible. 4 3G bandwidth can meet the needs of wireless monitoring Wireless video servers mainly include private network, WiFi, and public network transmission. Due to the high cost of deployment of private networks and WiFi networks, the scope is limited, and they have not been developed. Before the launch of 3G, the public network wireless video server was mainly based on CDMA1X. A small number of cities opened EDGE. Due to the limitation of network bandwidth, the effect of wireless image transmission on CDMA 1X and EDGE networks was not satisfactory. The transmission of video with low frame rate and low image quality cannot meet the needs of high-definition image transmission. 5 Application of 3G wireless video server in city bus Urban bus real-time video surveillance is a typical application that requires wireless transmission. Based on WLAN and private network, the cost is too high. It is more suitable to use the public network. Based on CDMA1X, the narrower the bandwidth, the poorer the quality of the transmitted image. Using 3G transmission can be very good. Solve this problem well. 5.1 Urban bus architecture The urban image information management system based on the 3G network is deployed according to geographic location and is divided into three levels, including city level, district (county) level, and street (town) level. Its architecture is shown in Figure 2. Figure 2 Urban bus architecture 5.2 Description of Urban Public Transportation System Platform The city image information management system based on 3G network includes 3G wireless video server, image information management platform and client. 3G wireless video server The original image collected by the 3G wireless video server is encoded using the H.264 algorithm, and the data is sent to the image information management platform through the 3G transmission method. Image Information Management Platform The image information management platform includes an image scheduling access platform and an image command management platform. Image scheduling access platform The image scheduling access platform is the core of the entire system. It includes platform management, alarm linkage, front-end equipment access, software upgrade, network management, database, WEB server, GIS server, video access, forwarding and other functional modules. Each module corresponds to one or more servers, and the functions of multiple modules can also be undertaken by one server. Image command management platform The image command management platform includes alarm, GPS data and other access, image access and large screen display system. The image command management platform is the execution unit of the city image information management system, which is responsible for the image and alarm access. Various command orders are also issued here. It is equivalent to the human brain, responsible for gathering information and making command decisions. Client The system supports users to browse videos through 3G network through mobile phones, portable computers and other terminals, so that users can watch videos without being restricted by location, which is more convenient and fast.
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