Design of Campus CCTV Surveillance System

First, the campus monitoring project background:

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(1) Through the closed-circuit television monitoring and observation of the main teaching places, the intuitiveness and objectivity of teaching evaluation can be increased, and it can play an important role in the comprehensive educational management. It has been proved to be an effective way to improve the teaching quality and teaching efficiency of the school. ;

(2) The modernization of the school must take into account its teaching information exchange function. The teaching television monitoring system can realize the closed-circuit television teaching in the school or realize the inter-school teaching exchange through the Internet.

(3) According to the internal security and technical precautions of the Central Committee of the Communist Party of China and the State Council to strengthen the institutions, schools and other units, the use of television monitoring systems in the teaching buildings can ensure continuous monitoring of public places, ensure the safety of personal property within the school, and strengthen campus security management. ;

Today's surveillance systems will be developed in the direction of integration, computerization, multimedia, and networking to achieve the goal of comprehensive multi-function, intelligent, automatic and remote transmission. The digital multimedia surveillance system is completely computer-based, using the latest digital video technology, fieldbus technology, and network communication technology to establish a set of software and hardware integration, new and complete multimedia monitoring system. So far, the most successful products for digital technology applications in surveillance are DVRs and remote monitoring systems. Recently, intelligent network cameras have emerged, which can transmit real-time color images using various standard networks, such as Ethernet, LAN and WAN, Public Telephone Line Switching Network (PSTN), integrated data service network and cellular telephone network. Small, but combined with the structure of a standard PC, thus achieving the image capture, compression and transmission capabilities necessary to transmit real-time color images on a variety of networks.

Combining the comprehensive situation of today's market with the development and processing capabilities of existing technologies, we have produced a new generation of multimedia surveillance systems, which are digital video recordings designed and developed by experienced technology and researchers based on security management needs. An advanced multimedia monitoring system that integrates network monitoring and remote digital image transmission.

Second, the basic components of the TV monitoring system

In the closed-circuit television monitoring system, the camera completes the task of real-time shooting of the scene of the monitored scene, and displays the captured image in real time by means of the monitor, so that the staff displays through the monitor screen in the monitoring room. The screen completes the monitoring of the scene in the area under its jurisdiction. In practical applications, in order to save important historical data or in unattended situations, it is sometimes necessary to record some or all of the scenes in the live scene in order to provide material for future teaching, which requires the use of video recorders.

Third, digital remote monitoring image transmission system

In CCTV surveillance systems, the transmission of video signals mainly refers to the transmission from the front-end camera to the monitoring center. The flow of video signals in the transmission system is directed by the front-end camera to the control center instead of the cable TV network. It flows to the TV terminal of each user through the cable television station. From this perspective, the flow of the TV monitoring system and the flow of the cable television network are just the opposite. Therefore, this leads to the TV transmission system having many specialities in signal transmission and being different or not completely similar to the cable television network.

In a local closed-circuit television monitoring system, the distance from the front-end camera to the central control room is usually within 1 km, so from the front-end camera to the central-end video equipment (such as video host, picture processor, monitor or video recorder, etc.) Most of the connections are directly connected by a video cable.

In practical applications, such as remote teaching, sometimes the distance from the front camera to the central control room may be far more than 1km. If the video cable is still used to transmit the image signal, the monitoring screen on the center end will not receive the order. The image that people are satisfied with, even if it is not received, and if it is at a certain distance, or a special area that is not suitable for wiring, the image transmission cannot be realized through the video cable at all. At this time, other transmission methods (such as LAN, telephone line transmission, microwave transmission, fiber transmission, etc.) must be used. Images from multiple scenes can be transferred to multiple destination hosts.

TV monitoring system program design regulations, system design principles

The system design adopts the most advanced technology and the rich experience of our company engaged in similar projects in the monitoring industry for many years. The system not only reflects the level of today's monitoring system, but also has potential for development. The quality, safety and convenience of the current construction and future maintenance are fully guaranteed, and the system design is targeted and economical.

1. Compatibility: The devices used are compatible with devices that are added in the future.

2. Standardization: The equipment and equipment selected are in compliance with the manufacturing and design standards for professional products in the monitoring industry.

3. Practicality: The equipment and equipment provided can meet the actual needs of the security monitoring system.

4. Flexibility: The system design offered is flexible enough.

5. Scalability: The designed system can easily add some new front-end devices, and the expansion is powerful. Most expansion devices can be plug-and-play. It provides sufficient guarantee for the expansion of the system and the expansion of functions in the future.

Second, the system design basis

National Standard of the People's Republic of China: "GB50198-94 Civilian Closed Circuit Television Monitoring System Engineering Technical Specification".
Security industry standards of the People's Republic of China: "GA/T75-94 Safety and Engineering Technical Specifications" "Electrical Design Code for Civil Buildings", according to the actual safety requirements of the site.

The TV monitoring system must configure and select reasonable equipment according to the actual situation, in order to achieve stable and reliable system operation, high equipment grade, strong expansion function, and can meet the actual requirements of the system. On this basis, the quality of the images and video playback captured by the camera should reach a high level, and strive to achieve the best monitoring effect at the lowest price.

According to the specific situation and actual needs of the college, combined with the current market and development direction of the TV monitoring system, with more, better and more refined ideas, our designers have specially prepared the implementation plan, and the user can make according to the actual situation. select.

Third, system design ideas

The design scheme is configured by the traditional analog monitoring mode, and strives to achieve the best monitoring effect at the lowest price; on this basis, the screen processing, video recording, principal sub-control, and connection with the closed-circuit television network are added; The functions of remote monitoring and networking improve the performance and grade of the entire monitoring system while achieving better monitoring results.

Fourth, system equipment design

The system consists of four parts: front-end equipment, transmission equipment, terminal equipment and remote monitoring.

Front end: includes color cameras, lenses, decoders, etc.
Transmission equipment: including various wire and amplification and switching equipment.
Terminal equipment: including color monitors, switching matrices, control software, long delay video recorders, etc.
Remote monitoring equipment: including local host, transmission system (LAN), control center (multimedia computer, printer and remote monitoring system software)
V. System design

The system consists of five main parts: front end, transmission, control and display, and INTERNET. It also has the functions of allocation, switching, recording and playback and campus network connection. 1, system front-end design

The system has a total of 45 image monitoring points: according to the school requirements on the first floor: set x color integrated camera, pickup, and can control the azimuth and lens; second floor: set x color integrated camera, pickup, and can control the orientation and Lens; and so on.

2, control system design

The main control room is equipped with 12 21-inch color surveillance cameras for main screen monitoring, 1 main control computer, 1 matrix control host and 2 monitoring adapters, and 1 set of main control software. The control of the system consists of a matrix switching control host, control software, and decoder:

(1) The control system selects a set of multimedia computer monitoring host, P4-1.5G/40G/17, and configures the corresponding multimedia monitoring software. As the management center of the system, it can easily access the Internet and has high openness and reliability.
(2) The microprocessor matrix switching control unit is used to switch the video and audio signals, and has the function of rotating the focus, focus, aperture and controlling the pan/tilt of the camera lens.
The matrix control function with multi-channel camera is controlled by a microprocessor using a large-scale audio and video switching dedicated chip as a multi-channel multi-channel medium-sized switching device of the video switching matrix circuit;
With modular plug-in structure, there are plug-in boards for various modules such as video input, video output, alarm input, etc. Users can freely choose a variety of plug-in boards to combine the required amount and function of the switching device, simple configuration, reduce The external supporting equipment of the mainframe is convenient for future maintenance;
Set the control operation, through the keyboard and mouse, the user can program, the programmed image signal display mode can be fixed display or time series display, both sequential and reversible time series, and the number of cameras participating in the time series display and Any time interval can be preset. The following functions can also be realized through the keyboard: the camera power is turned on and off; the pan/tilt is rotated left, right, up, and down; the lens is zoomed, focused, far, near, etc.;
(3) Configuring media devices such as media player modems and mixers to enable networking with closed-circuit television teaching;
(4) To meet the needs of multi-point management, the principal's room has a sub-control point. The sub-control computer selects the P4 microcomputer, adds the image acquisition card, and the control software. The sub-control personnel can control and monitor through the computer network on their own computers. ;
3, the design of the transmission part

The system video signal transmission uses a coaxial cable.
The system control signal transmission uses a double core shielded signal line.
The network signal uses a Category 5 twisted pair.
The system uses the LAN/WAN form based on TCP/IP protocol to construct the system network structure. Video/audio transmission uses image compression transmission. Remote image transmission methods are diverse: including PSTN telephone mode, DDN mode, E1 mode, and ATM-based network mode. This feature allows users to choose the best solution based on their different requirements and budget for remote images.
4, display and record part of the design

According to the scale of the system, another TV monitor wall screen is designed, which consists of 12 21-inch TV sets. The camera is monitored in groups. The multimedia console is used in the operation console, and the computer monitor is used as the main monitor. In this way, the screens of the 45 monitoring points of the whole school can be displayed on the monitoring wall.

5, network function

The monitoring signal is connected to the network through the video capture card and the network computer and the Internet.