For enterprise-level applications, the construction of video surveillance systems is often not determined by the number of employees in the enterprise but rather based on the areas requiring video surveillance and the objects to be monitored. For chain enterprises, factories, and warehouses that cover large areas, the regions they need to monitor are usually extensive, meaning they require a relatively large-scale networked video surveillance system with mobile video monitoring capabilities.
Typically, such large-scale networked video surveillance solutions adopt a decentralized distribution with centralized monitoring management. Due to the large number of monitoring points, if the system architecture is unreasonable, it can easily lead to network congestion. If different users access images through various internet methods from different locations, simultaneous image access by many people can easily affect the speed and quality of the images. Therefore, when selecting this type of large-scale monitoring system, we need to address the following issues:
1) Large networked centralized monitoring systems are generally divided into multiple sites, with networks managed in a multi-level distributed manner. The data needs to be transmitted via the network to the monitoring center for unified management and control.
2) A video server should be installed at each front-end site. Each site is both a part of the large centralized monitoring system and can independently control all the monitoring conditions in its area.
3) Unified management of the entire monitoring system should be conducted, including user authentication, management, and front-end device management. For monitoring points with a large number of login users and frequent access, corresponding streaming media servers can be used for forwarding and bandwidth adjustment, with multicast access enabled.
4) Both local sites and the monitoring center can record videos. Recorded materials should be managed uniformly, with an effective retrieval mechanism established to facilitate searching.
5) Address the issue of cross-network image access without fixed IP addresses.
6) Solve the problem of accessing images through different internet methods and from different locations.
7) Address the issue of multiple people accessing images simultaneously affecting image speed and quality, causing network congestion.
8) Solve the problem of complex management structures and multi-level permission controls for multiple users.
9) Address the issue of wanting to centrally manage dispersed monitoring points.
10) Support web-based image browsing to enhance network functionality, allowing images to be transmitted via both local area networks (LANs) and ADSL. Network users should be able to view or replay images and remotely control pan-tilt units.
In this large-scale networked video surveillance solution, we can use a structure consisting of analog cameras + encoders + streaming media servers + storage devices. A server should be equipped at the headquarters, with network video surveillance management platform software installed to build a network video surveillance management server. The server should also be equipped with disks of appropriate capacity and quantity to meet the requirements for storing recorded data over a specified period.
Video data is converted into IP data packets by the encoder, then transmitted through the network to the monitoring center. The data is then distributed by the streaming media server, with one stream sent to the display terminal and another reaching the storage device for long-term preservation. Additionally, the management server performs system settings and maintenance for the front-end devices, while the Web server provides clients with B/S or C/S architecture-based browsing or management functions.
Warehouse Surveillance System