China is in a historical period of rapid development. Education and rejuvenation of the country is a basic national policy of China. The whole society has invested great attention and great human and material resources in education. Parents and all sectors of society have healthy growth for the next generation. Personal safety, personal dignity, and personal rights have given great attention. The real society is complicated. The students and teachers of different personalities and personalities are in the same crowded space. It is easy to have various contradictions and accidents. The accidents that happened by chance were particularly concerned by public opinion and often caused great trouble to the school. Therefore, safety and security work is becoming more and more important for schools.
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Campus monitoring system features
External monitoring
Several consecutive campus security incidents, such as vicious personal infringements at school gates and social hooliganism in school teachers and students, have seriously infringed on students’ rights and lives, reflecting the various crimes against campus. With an increasing trend, campus security has become a hot issue of current social concern and has risen to the national level. Effectively solving the current campus security risks and ensuring campus security has become an important part of creating a safe society. Through the analysis of several campus personal infringement incidents, it is found that the lawless elements are basically forcibly breaking into the campus or committing crimes at the school gate. It can be seen that the entrances and exits of the campus are the key areas of security work, and the corresponding video surveillance and other measures must be adopted to achieve the functions of early warning and timely reporting to the security department.
Internal monitoring
Due to the increasingly concealed behavior of cheating on campus exams and the increasingly technicalization of cheating, in order to ensure the supervision and management pressure of personnel in each classroom as an examination room, and to ensure the discipline of the examination room, it can even be used as a multimedia classroom in peacetime. School leaders evaluate the quality of teaching in each class through the system, and it is imperative to build a multimedia closed-circuit monitoring system.
At the same time, the school is a crowded area, and the school time is fixed, so the flow of people is explosive, and it is easier to step on the stairs, passages and other places. Therefore, in these densely populated areas, monitoring should also be strengthened. In this way, once an abnormal situation is found, the plan can be taken immediately to effectively avoid the accident. For some places where schools are prone to fights, such as playgrounds, indoor activity areas, and major road junctions, video surveillance is also needed. In addition, in order to effectively protect the life and property of students and schools, it is necessary to set up video surveillance systems in the entrances and exits of teaching buildings, student residences, and some corridors, parking lots and bicycle sheds to achieve safety monitoring.
NVR campus monitoring system solution architecture
The front end of the system is all HD IP cameras. Spherical HD IP cameras can be set at the school gate. Four HD IP cameras can be set in each classroom. In other places, such as playgrounds and storage areas, infrared HD IP cameras can be set. Their resolutions support 1080p and 720p, enabling the input of high-definition video streams. In the middle part of the system, the data transmission, forwarding, and storage functions are completed by the campus network, switch, router, and NVR. The back end of the system can directly use NVR or platform software to manage front-end cameras, preview images, and store data using the graphical interface provided by NVR. It can also use platform software to manage multiple NVRs to preview and store data. In addition, the platform software can also connect multiple network storage servers to expand the storage capacity of the system, or connect to the video wall to preview more videos. These three parts are closely combined to achieve high-definition image acquisition, transmission, storage and management (Figure 1). The system is designed for campus, with stable performance and good scalability and maintainability.
NVR campus monitoring system program features
The current monitoring system can be roughly divided into two types: NVR and DVR. The NVR is connected to the IP camera with the network digital video recorder as the center, and the real-time preview forwarding and storage function is implemented with the platform software; the DVR is a traditional digital video recording system. It is directly connected to an analog or digital camera for preview, forwarding and storage. These two solutions have the following distinct advantages over NVR:
Easy to install and easy to use
The NVR monitoring system greatly simplifies the types and quantities of devices that may be involved in the monitoring system. It completely replaces the video matrix, switcher, picture splitter, character adder, video line, audio line, and alarm line in the DVR monitoring system. , control lines, and more. The NVR can be installed in a distributed structure. It can transmit video, audio, control and power signals simultaneously with a single network cable. It can also collect multiple channels of video, audio and control through a switch to a network cable, which greatly saves installation costs. Reduced installation difficulty. When transmitting over long distances, replacing the expensive optical transceiver with an inexpensive optical transceiver, the transmission cost is low, the stability and reliability of the overall system are greatly improved, and the difficulty of maintaining the equipment in the future is reduced. When you use it, you can use the platform software to view images and manage cameras.
HD image low bandwidth
Because the network camera chip adopts the most international IPCNVR, IPC LAN, router, NVR host, and internal hard disk, it completes the storage, preview and forwarding of video data. NVR access platform, manage multiple NVRs, forward streaming media, real-time preview, network storage IPCIPCNVR client decoding card decoding card Figure 1 New H.264 compression mode for image compression, can use very narrow bandwidth, through frame reconstruction technology To compress and transfer data, so you can achieve high definition. The network camera can also automatically adjust the code stream according to the bandwidth, so the network load will not be increased too much if the image is clear.
Seamless scalability can form a very large monitoring network
The advanced nature of the NVR system is the use of a powerful video processing chip that can process high-quality dynamic images in real time and support simultaneous access by multiple users. Under the LAN, you can allow unlimited users to access at the same time. Network cameras are identified by IP addresses. Adding devices only means the expansion of IP addresses. Therefore, the networking mode is very different from traditional analog monitoring and PC-based monitoring. The network camera output has been simulated. To digital conversion and compression, using a unified protocol to transmit over the network, it supports remote video transmission across gateways and across routers, while DVRs cannot achieve large-scale remote expansion due to signal transmission limitations and other reasons.
Remote system maintenance and system management
The NVR system provides software access and remote WEB access. The administrator remotely manages the system equipment through the software without having to reach the equipment site, which improves the equipment maintenance efficiency. At the same time, the administrator can modify the user information: remotely add, delete the monitoring location, the user's control authority, recording time and alarm information. After the information is modified, the administrator does not need to maintain the client. The user only needs to log in to the system again to get the information re-allocated by the administrator, which greatly reduces the software maintenance workload of the administrator and the graphical interface operation with the DVR. Compared with obvious advantages.
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