1. Overview

The concept of developing a harmonious society and a safe city, as well as the society’s attention to education, recently there have been many bloody and violent incidents on campus, so the safety of campus has to be paid attention to. Because there are few school administrators and many students, the campus monitoring brings a lot of inconvenience to the school’s safety management. In order to keep abreast of the school dynamics, find hidden dangers and record abnormal situations at any time In order to prevent immediately or as an objective basis for post analysis and processing. Therefore, the installation of monitoring facilities in schools has become a trend. In practice, giving full play to the function of computer unattended and all-weather safety monitoring is the best auxiliary safety management scheme to save manpower and material resources.

Campus monitoring can be divided into campus security monitoring and superior comprehensive centralized monitoring. It adopts the latest third generation of all digital video analysis monitoring system based on network in the world, which completely overcomes the defects of traditional analog monitoring system, and is better in function and performance. This system mainly uses the latest computer processing technology to compress the video and audio signals of each monitoring point at the front end into digital signals, which are transmitted to the monitoring center through the network, and then the digital signals are restored to video and audio signals and displayed in the monitoring center. In addition, it can also carry out intelligent analysis and alarm processing for key areas. By using international advanced video intelligent analysis equipment, it will be able to give early warning and timely alarm for unsafe factors, which can effectively curb the occurrence of campus violence and other criminal events.

The digital network monitoring system is also adopted by the superior comprehensive centralized monitoring system, which belongs to the same system as the campus security monitoring system. However, the superior education department’s comprehensive centralized monitoring of all schools in the area under its jurisdiction depends on the advanced system structure design, which can flexibly and perfectly integrate the two systems, facilitate the use of the campus management personnel, and achieve a higher level of security, The real security of the school.

From the regional and functional aspects, it is divided into two parts: campus security monitoring and superior comprehensive monitoring, involving a wide range and a large number. No matter in campus security monitoring or comprehensive monitoring, all monitoring points adopt the method of distributed deployment and integrate into the same special monitoring network. The wiring is treated as a physical network, and the management of the two can be centralized management, centralized storage and decentralized management.

2. System introduction

Campus security monitoring system includes front-end image information acquisition system, monitoring exchange network system, digital video image management system, video image display system, image storage system and many corresponding management control and application software. The front-end image information acquisition system mainly includes: DVR hard disk video recorder or IPC network camera and other video coding equipment.

Campus monitoring management system is composed of video acquisition system, video transmission system and central management system. The video acquisition system is composed of the front-end ball simulator or gun and video analysis and coding equipment. The video transmission system mainly relies on the network transmission of optical fiber or Ethernet LAN, and can also realize the network monitoring of campus network. The central management system is mainly composed of central control and alarm server and storage server, which realizes the storage of background data, video viewing, alarm response, etc.; the client can also be installed in each monitoring point, such as security monitoring point, principal office, etc., which is responsible for inspecting the situation of each monitoring point, and various networks to monitor the real-time video of each monitoring point in the campus.

The overall campus classroom monitoring simulation topology is shown in the figure below:

The function and application of the school integrated centralized monitoring system

As shown in the figure above, each monitoring point of the school is equipped with a camera, and the video cable is connected to the video coding analysis equipment, which converts the analog signal into digital signal, and sends the digital signal to each computer of the network through the LAN. The computer can realize the video display, storage, information control and alarm through a special client handle.

2.1 data acquisition

The acquisition part is the front part of the monitoring system and the “eye” of the whole system. It turns the monitored content into image signal and transmits it to the monitor of the control center. The quality of the acquisition part and the image signal it produces will affect the quality of the whole system.

The real-time image monitoring system is mainly provided by the client of the system.

The video storage part will make different plans according to the needs of users to realize the centralized management of a variety of different videos

The alarm linkage part is to realize the alarm linkage video and output control between devices.

Data management system is the management of login users, basic information of equipment, various types of logs, etc.

2.2 data transmission layer

The data transmission layer is the whole process of the front end from the camera to the video encoder to encode and then transmit to the monitoring center platform. Data transmission layer involves network load, network balance, network transfer and many other details.

The purpose of data transmission is to send the collected data back to the user monitoring platform. At the same time, in the campus network, the network bandwidth of the campus network itself is fully considered.

The data transmitted to the central platform can be stored, forwarded, decoded and other operations, and finally output to the TV wall, can be forwarded to the Internet, and can also support wireless transmission.

2.3 monitoring center management platform system

The audio and video monitoring management software platform is responsible for the authentication, configuration, detection, control instruction forwarding, data transfer, storage and other functions of the whole system

1、 Image monitoring part

The image monitoring part is mainly completed by the client in this system.

After logging in, the client can see the video image of any device in the network, and can control the PTZ and query the video, which is the core part of the whole monitoring system.

According to the actual situation of users, the system provides more humanized design, can perfectly combine the device and map, more intuitive and convenient intelligent monitoring, can divide the two areas into two maps.

2、 Video storage part

Video storage part, according to the storage location can be divided into: client local storage, storage server storage, front-end device storage. These three storage methods can achieve unified classification management.

Client storage: when users use the client video monitoring, they can manually store the monitored images to the local client’s hard disk at any time, and can also link the client according to the alarm strategy to realize the storage of alarm linkage video.

Storage server storage:

Storage server is the video recording and playback device of video monitoring system, which requires a very long recording time, and the storage server can expand the storage space indefinitely, which can meet the storage requirements of customers for a week as long as a month.

The storage server has automatic maintenance function, can maintain long-term background work, stable performance, provides convenient query function and playback function, supports 16 channel image playback at the same time, supports fast forward, slow play, pause and other functions, and can conveniently retrieve according to the type and time, supports sound monitoring and image interception in the playback process, which is convenient for users to obtain evidence in the future It’s very convenient.

The storage server can also work with the front-end network camera with PTZ. When an alarm occurs, it can record the video, adjust the preset position, and record the video image needed when the alarm occurs.

Front end device storage:

It refers to the front-end video acquisition and coding equipment that can realize storage, which depends on whether the equipment in the specific project supports the storage function of the equipment.

3、 Alarm linkage part

The main core of the alarm linkage part is the alarm server, and the auxiliary modules are: storage server, client, database server, front-end equipment.

It can realize the alarm information recording, linkage alarm video monitoring, linkage alarm video recording, linkage equipment probe output and other comprehensive alarm strategies.

4、 Data management part

The data management part is not video data, but includes the login system users and user permissions, basic information of equipment login, storage schedule, alarm linkage table, operation and alarm log and other data, which is the hub and basic part of the system.

The core of data management part is: database server, which is based on SQL Server database with high stability, high security, high reliability and wide application range. The data mentioned above will be uniformly stored in the database, which truly realizes the centralized intelligent management.

3. Function introduction

Monitoring function

Through the campus network, you can directly see the scene of each monitoring point on the computer of the monitoring center, and you can also switch the situation of each monitoring point to the TV wall for observation.

Image segmentation display

Without the need of image splitter and switching control matrix equipment, multi video images can be segmented and displayed on the same screen (1, 4, 9, 16 channels) and multi group images can be displayed in turn by setting the central management server.

Campus monitoring

Through the central management server settings, the scenes in the important areas of the school are switched to the TV wall for monitoring, or the front end sends out control instructions to adjust the focal length of the camera or pan tilt for local detail observation.

Mass storage

All scenes can be recorded in real time or at a fixed time, or manually started or stopped, or triggered by an alarm. The recording media are computer hard disk, array, NAS, etc. the recording disk capacity space can be set, and it has the function of automatic coverage.

Intelligent retrieval playback

It can intelligently and quickly retrieve the playback recorded video data according to the time, camera number, alarm events and other conditions. The playback has many ways, such as frame by frame, slow playback, constant speed, fast and zoom in / out, and can store any playback image into JPEG or BMP format for data exchange or print output.

Character overlay

In each channel of video, real-time overlay time, monitoring point name and other information, so that access at a glance.

Scene capture

In the process of viewing the main control computer of the regional monitoring center or the sub control point computer of the campus network, you can capture and save the sudden scene pictures of the window image at any time.

Internet broadcasting

English listening voice can be played through the network at any time to prevent the sudden damage of campus broadcast and the impact of emergencies on important examinations

Electronic broadcasting (public broadcasting)

The management software can be used to carry out electronic broadcasting to the remote designated classroom, and the set range can be carried out voice broadcasting through electronic broadcasting.

Authority management

The hierarchical management of operation authority is implemented. Each user is given different authority levels according to the nature of work. The system login and operation are checked to ensure the security of the system.

Special control by headmaster

The principal can select any monitoring point of the school on the screen through the monitoring client.

Remote network inspection

All levels of education management departments can watch the scene video remotely through the campus network or wan to control the overall situation at any time

School monitoring

It has all the functions of traditional monitoring, such as alarm processing, video display, video storage, electronic map, voice intercom and so on. Its digital processing technology makes forwarding easy

Multimedia teaching

Without any additional cost, the system can provide distance teaching demonstration function. We know that in order to promote the advanced teaching experience of excellent teachers, or to investigate the teaching level of teachers, schools often need to arrange teaching demonstration classes. However, the traditional teaching demonstration is to arrange the audience in the classroom, which not only limits the number of people attending the class, but also affects the normal teaching, and the traditional teaching demonstration can only be carried out locally, It’s even more inconvenient for teachers to observe in other places. In addition to live broadcast of the teaching demonstration course, the system can also make real-time video recording. The personnel listening to the teaching demonstration course can see the actual situation of the teaching demonstration without entering the teaching scene. The teachers in different places can easily watch the whole teaching demonstration course through the Internet (or WAN).

4. System equipment selection and configuration description

4.1 client configuration requirements

As the terminal equipment of real-time monitoring and playback video, the main function of client is decoding and display. Therefore, it needs to configure high-performance CPU, large capacity memory and high-quality display card. The recommended configuration is as follows:

Operating system: Windows XP, windows 2003

CPU: above p42.8

Memory: 512M

Display card: ATI graphics card, more than 64M video memory, agp8 speed interface

Network card: 10 / 100 MB network card

sound card

Hard disk: the minimum configuration, can install the operating system, if you need local video, the larger the hard disk is better

4.2 database server configuration requirements

The database of the system is the database of SQL server, and the database is established in SQL server. The database server can be configured normally. The recommended configuration is as follows:

Operating system: Windows XP, windows 2003

CPU: above p42.8g or dedicated server CPU

Display card: ordinary graphics card

Memory: 1g

Network card: 10 / 100 MB network card

Hard disk: minimum configuration, can install the operating system

4.3 alarm server configuration requirements

The alarm server is responsible for receiving the front-end alarm and intercom information, writing it into the database, and sending the intercom and alarm information to the associated client. Therefore, the configuration of alarm server is mainly to use higher performance CPU and better network. The recommended configuration is as follows:

Operating system: Windows XP, windows 2003

CPU: above p42.8g or dedicated server CPU

Display card: ordinary graphics card

Memory: 1g

Network card: 10 / 100 MB network card

Hard disk: minimum configuration, can install the operating system

4.4 storage server configuration requirements

The storage server is responsible for acquiring audio and video data from the front end, storing (writing disk) and creating index to provide remote client access. Therefore, the storage server needs special server equipment, high-performance CPU and large capacity memory. The specific configuration is as follows:

Operating system: Windows XP, windows 2003

CPU: above p42.8g or dedicated server CPU

Display card: ordinary graphics card

Memory: 1g

Network card: dual Gigabit network card

High speed hard disk: SCSI interface, 12000 rpm, hard disk capacity is configured according to storage requirements

External storage device: you can select raid or NAS (it is required to be mapped into physical disk), and the capacity is configured according to the storage requirements

5. System design basis and guiding ideology

5.1 design basis

Based on the actual needs of the education industry, as well as the practical experience in the application of this product in the education system for many times, and the overall construction objectives, system functions, technical performance indicators, etc. proposed in the technical part of each bidding document, the design focuses on the reference of “industrial television system engineering design specification”, “MPEG4 video and audio codec standard – Coding of audio-visual objects (6 parts)” “100base-tx Fast Ethernet interface standard”, “TV monitoring engineering procedures and requirements” and other standards.

5.2 design guidelines

This solution is to meet the practical application as the starting point, in terms of video transmission, try to make use of the existing campus network, in order to minimize the system cost.

Advanced performance and function: the equipment selection shall ensure leading technology, reliable performance, simple and practical operation, simple maintenance, optimal performance price ratio, and leave room for expansion. The equipment adopts the current leading technology and production process. After the completion of the system, it will not be out of date in three to five years.

Perfect system function: it can realize all kinds of functions needed in practical application.

Simple and practical operation: adopt high-tech means and carry out intelligent design to minimize the complexity of system operation. And make the system work stable and reliable, simple maintenance.

Beautiful appearance: safety, concealment and beauty shall be considered in the installation of front-end devices.

The selected hardware for system stability and reliability are advanced, mature and reliable products with good operation performance.

The advanced nature of the system: adopting the most advanced combination of hardware and software, making system compatibility, upgrading and expansion easier, and adopting module structure to maintain simplification.

Easy operation and real-time: all operations adopt windows standard window operation, and the signal can be uploaded in real time to achieve real-time.

Low maintenance: through modular and hierarchical design, the maintenance free system can be basically realized.

Scalability: it is convenient to connect the network level by level, increase or decrease various front-end equipment, etc.

6. System features

6.1 the login mode of system is user name + password

Ø with single sign on function, all subsystems and equipment management can log in once, and then carry out relevant operations according to the authorization;

All users of the system are assigned user roles according to their regions, departments and responsibilities. Different roles define different levels and operation permissions, corresponding to different operation contents, including video contents that can be viewed, videos that can be played, control of pan tilt lens, system information that can be edited and modified, setting and control of equipment, etc.

Ø the system administrator can modify the editing role, user permissions and content as needed;

6.2 remote setting of equipment parameters, status inspection and control functions

It can remotely configure the parameters of front-end DVR equipment

Ø be able to conduct regular automatic or manual remote inspection on the working state of the front-end equipment, carry out statistical management on the working state of the equipment, including the equipment connection state, hard disk error information, video status, etc., and give timely alarm in case of any abnormality, so as to facilitate the personnel on duty to grasp the operation of the equipment, deal with the problems in time and take preventive measures;

Ø remote restart and timing of front-end equipment, and manual control

6.3 electronic map display and management function

The network map is used to realize the sharing of map data and database among all users in the network;

The alarm position can be displayed on the electronic map when the alarm is triggered;

Ø all monitoring points can be marked on the electronic map. Just click the mark on the map, you can easily obtain the video image of the monitoring point, and also query and play the video data of the monitoring point;

Ø can realize the zoom of electronic map, adopt multi-level electronic map management, and display by region.

6.4 intelligent video analysis function

Intrusion detection analysis

Intelligent analysis can be realized for special monitoring points, including intrusion detection, which supports three detection modes. Movement behavior mode: automatic alarm when someone or vehicle invades the monitoring area; trip net crossing mode: automatic alarm when person or vehicle crosses trip line; fence intrusion mode: fast detection mode for climbing (or crossing) perimeter and fence Configuration mode

Automatic PTZ tracking

It can make the camera drive its own PTZ pan tilt and zoom lens independently, and automatically control the PTZ camera to rotate the pan tilt and zoom the lens in all directions. It can automatically track the locked moving target with visual guidance, so as to ensure that the tracking target continues to appear in the center of the lens with enlarged feature picture, so that the security personnel can see the information more clearly, and at the same time, it can also track the target It can be used to collect evidence afterwards.

Manual lock mode: manually lock the moving target through the monitoring software

Automatic lock mode: Patrol among preset positions, and automatically lock moving targets when intrusion is detected

Relay lock mode: when a camera detects intrusion, it informs other PTZ cameras to lock the moving target

Linkage alarm

Cooperate with the alarm server for alarm linkage output, linkage video pop-up, linkage 110 button.

6.5 integrated intelligent alarm strategy management and video linkage function

Ø through the alarm event server, all alarms such as technical button and probe alarm, access control alarm, video movement detection alarm, video loss alarm and equipment status alarm can be managed uniformly;

Ø can define alarm source, alarm type, alarm level, linkage rules and alarm plan, automatically associate real-time video and start video through alarm engine, start on-site sound, light, door and other equipment, and send different alarms to different responsible users;

The monitoring center and other user clients receive and display the corresponding alarm information according to the user-defined alarm forwarding rules, and automatically switch to display the real-time video image associated with the alarm point.

6.6 video monitoring

Remote real time video monitoring function

It can support 16 screen split display on the client (high hardware configuration is required);

The monitoring points can be grouped and combined with pictures in advance to realize automatic switching and round patrol of multi picture grouping.

Support multi screen synchronous display and patrol display, support multiple predefined patrol plans;

Ø for some specific monitoring images, privacy occlusion function can be set (supported by DVR device), and the occlusion area cannot be viewed and displayed.

6.7 video strategy management and video data retrieval and playback function

You can set different recording methods, such as timing recording, alarm triggering recording, mobile recording, etc. The alarm trigger video can record the image 30 seconds before the alarm, which is convenient for future analysis and evidence collection;

It can retrieve the front-end DVR and video data stored in a centralized way according to the channel, time and alarm events. It supports fast playback, slow playback, time bar drag playback and defined time point playback. It can capture the monitoring images and video images, and save them in various standard image formats;

The central storage server sets the persistent save area and liquidation policy. When the disk is full, it will be automatically wound up according to the policy, and the persistent save area will not be wound up.

Video editing and remote backup function

Remote backup and editing of front-end DVR Video data can be realized;

6.8 remote monitoring and two-way intercom function

Ø through the input channel of video coding and analysis equipment, the on-site sound and real-time monitoring and video and audio synchronous recording are realized;

Through the two-way intercom interface of video coding analysis equipment, the remote two-way intercom with the on-site personnel of the monitoring test site is realized, and the real-time recording is carried out.

Editor in charge: GT

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