The following discusses the construction of the video surveillance system and future development trends. The rapid development of Internet technology and applications has affected the field of video surveillance. The use of inexpensive IP network resources to complete the dynamic real-time transmission of surveillance images has enabled people to basically access their own anywhere, anytime (AnyTIme) In the system, the required audio, video and other monitoring alarm information can be obtained at any time.

Development of Video Surveillance Technology Since surveillance technology entered China in the 1980s, it has been developing rapidly with the sharp increase in security requirements. From the technical level, it has experienced the following different development stages. The first generation is full analog surveillance, also known as closed-circuit television surveillance. It has dominated the security market for more than a decade from the 1980s to the early 1990s, and is widely used in public security, banking, military, transportation, Hotels and other important units and departments. Its characteristic is that all the video signals of the camera are transmitted to the monitoring center by analog mode. The monitoring center outputs part of the video signals on the analog display devices such as TV sets through video distribution and synthesis equipment, and records or saves them through tape recording equipment. The second generation is the quasi-digital monitoring system. It has appeared since the mid-1990s. It is represented by the replacement of the original long-delay analog video recorder with digital hard disk recording DVR, and the original tape storage mode is changed into digital storage recording, thus solving The analog to digital recording and display problems of monitoring are integrated with functions such as video recorders and picture splitters, and take the first step of digital monitoring. The third generation is an all-digital monitoring system, mainly based on embedded hard disk recording DVR. This is an embedded system that integrates application programs and operating systems with microprocessors and various chips. Its characteristics are: Modified, compact structure, get rid of the instability problem of PC, but the remote image transmission is limited to the local area network. With the development of computer technology and the popularization of the network, video surveillance has now developed into a network multimedia surveillance system.
Network multimedia monitoring system The fundamental difference between the new generation of video surveillance management system and previous generations is that it is no longer limited to simply completing the processing, transmission, and control of video signals. Its core lies in the multimedia information (video, audio) based on IP network. , Data) to provide a comprehensive and complete management and control platform. The network multimedia monitoring system is based on the network, with the compression, transmission, storage and playback of digital video as the core, featuring intelligent and practical image analysis, and integrating the alarm system and the access control system into a use platform. It triggered a technological revolution in the video surveillance industry and quickly received the attention of the security industry and users. At present, the network multimedia monitoring and management system has been widely used in multimedia video dispatching command, network video monitoring and conference, multimedia online live broadcast, network teaching, telemedicine and other aspects. The network multimedia monitoring system consists of a network multimedia monitoring management platform and front-end information collection equipment. Its core is a network multimedia monitoring management platform. The platform integrates computer network, communication, video processing, streaming media and automation technology into one, is an integrated solution of video, audio, data and graphics. It also has network video monitoring, video conferencing, live video and other functions, and has a super large Large-scale networking capability is a comprehensive multimedia service management platform built on the LAN / Internet network and supporting multiple transmission methods. Its application has far exceeded what the monitoring itself covers. Features of Network Multimedia Surveillance System Although the previous video surveillance system has realized the transmission from analog to digital to support IP network, but the front-end equipment has a single function and the management system is relatively simple, it has been difficult to complete the continuous expansion and increasingly complex functions of the current surveillance network Demand, the network multimedia monitoring and management system came into being, and its characteristics are mainly reflected in the digitalization, networking, intelligence, systemization and ultra-large-scale networking capabilities of multimedia applications.
1. Hierarchical network management The monitoring network in the past is usually an individual system of each enterprise or industry in some regions. The current monitoring requirements have developed into cross-industry networking, and the network scale is getting larger and larger. The previous monitoring system has been unable to manage this Large-scale monitoring network, and the network multimedia monitoring and management platform has a very large-scale networking capability due to the hierarchical management control method.
2. The standard network architecture system is based on the C / S or B / S architecture, supports the monitoring of computers and handheld PDAs, and provides great convenience for users.
3. Organically integrate with GIS, MIS and other systems. Network multimedia monitoring and management platform organically integrates geographic information system (GIS) and management information system (MIS), which provides great convenience for users' comprehensive management.
4. Distributed information forwarding and storage Although audio and video information is compressed and encoded, it still occupies a large transmission bandwidth and storage space. The network multimedia monitoring and management platform uses distributed information forwarding and storage, and performs virtual matrix on the IP network. Control, which greatly improves the utilization rate of network bandwidth and greatly reduces the investment of hardware equipment.
5. The addressing and positioning automation network multimedia monitoring and management platform uses dynamic domain name resolution technology. The front end and the client only need a simple login operation. After authentication, the system can automatically complete the addressing and positioning function of the newly added equipment, so that the monitoring system Really realized plug and play, "promise" expansion.
6. Efficient use of private IP addresses The network multimedia monitoring and management platform uses virtual IP address technology, which enables the effective use of private IP addresses and greatly saves limited public IP address resources.
7. The linkage management with various alarm functions and the linkage management with various alarm functions and access control systems enable the system to detect multiple alarm signals. When an alarm occurs, one or several devices can be linked to work together, such as automatically starting the recording function (which can record a certain time before the alarm), the camera goes to the alarm preset position, send a text message to the designated person, voice prompt or phone call and many more.
8. Remote management The remote management function can realize remote maintenance, remote configuration, and remote status query, which can greatly reduce the workload of on-site maintenance, just as convenient as local. Intelligent and mobile are development trends. With the increasing maturity of video surveillance systems, the current video surveillance systems have begun to develop in the direction of intelligence. The functions of a typical intelligent video surveillance system include:
(1) Image recognition functions, such as recognizing face images in video images, recognizing specific people in audio, license plate recognition, and target recognition functions in various industries.
(2) Image analysis function, such as motion analysis in the sensitive area defined in the image range, and provide targeted video recording, target tracking and alarm linkage functions.
(3) Security linkage related to business in the application field, such as the interaction between various security sensors, controllers, audio and video recording, and monitoring and alarming. Various application areas can easily and flexibly define various related linkages on the monitoring software.

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