Centralized storage. In large projects, centralized storage is generally used to store monitoring data. In a centralized storage system, the SAN architecture is generally used. SANs provide a dedicated, highly reliable storage network that allows them to independently increase their storage capacity, as well as simplify management and centralized control (especially when all storage devices are grouped together). Because of these characteristics, the SAN architecture is particularly suitable for storage applications of large-scale network digital video surveillance systems and can handle the storage of thousands of thousands of front-end monitoring points. At present, SANs are mainly divided into FC-SANs (fiber storage area networks) and IP-SANs (Ethernet storage area networks). The difference between them is the difference between connecting lines and using data transmission protocols. Although FC-SAN adopts a dedicated protocol to ensure more stable and efficient transmission, its deployment method and construction cost are much higher than that of IP-SAN. Therefore, the IP-SAN is currently used in large-scale network digital video surveillance systems. - SAN architecture.
However, with the expansion of the scale of storage applications, the problems brought about by the use of general-purpose storage devices, especially the storage devices of the server architecture, are increasingly evident. Mainly in the following areas:
A surge in costs
In a large-scale project, there are too many front-end image information collection points, and the capacity of a single server is limited, resulting in the need to configure dozens or even hundreds of servers. This will inevitably lead to a sharp increase in construction costs, management costs, maintenance costs, energy costs.
Disk fragmentation issues
Since video surveillance systems often use a rollback write method, such out-of-order frequent read and write operations result in a large amount of disk fragmentation. As the usage time increases, the read/write performance of the entire storage system will be seriously affected, and even the storage system will be locked for read-only, and new video data cannot be written.
Performance issues
Due to the dramatic increase in the amount of data, the indexing efficiency of video data has also become more and more of concern. The data on TB, even hundreds of terabytes of data, often takes a few minutes to index.
It should be said that in recent years, with the vigorous development of the security industry, most domestic storage companies have also taken control of storage trains. However, at present, there are still many problems in monitoring storage devices that need to be resolved by security companies.
Question 3: Intelligent Application of Video Surveillance System
As far as the current situation is concerned, monitoring networks lack smart applications. The urban emergency system that is linked with large-scale video surveillance systems is one of the keys to solving public security and disaster prevention problems. It is necessary to establish a sound and reliable intelligent linkage command system. How to integrate intelligent command management based on public security services and security systems based on monitoring services is a difficult point in current urban security systems. This requires a higher level of system intelligence. At present, the image content analysis of the video surveillance network still needs to rely on artificial real-time viewing and manual access. With the expansion of the scale of monitoring networks, the massive increase of video data and the large number of people used for image monitoring and retrieval have become a bottleneck restricting the full use of video surveillance network performance. It is getting more and more difficult to obtain useful information or intelligence from massive surveillance videos. From the perspective of practical applications, information should be searchable and queryable. However, the current application of surveillance video is mostly the reproduction and playback of surveillance scenes, and it is difficult to meet the needs of user information applications.
After the completion of a large-scale video surveillance system, its operating costs are also very high. I have heard that after a small police station has built a small monitoring system, the electricity cost for one year will be 10,000 yuan. It feels a lot of pressure. The operating costs of large-scale video surveillance systems account for only a small part of the electricity cost, and more is communication. , equipment maintenance and update costs. Since monitoring equipments are mostly operated continuously for 24 hours, the level of staff is not uniform, the equipment maintenance and update cycle is short, and the required expenses are relatively large. Therefore, the system's plan should comprehensively consider the construction costs and operating costs to facilitate the long-term operation of the system. The development of multi-domain applications for large-scale video surveillance systems is a development trend and necessity. Flexible use is made of intelligent video processing technologies such as face recognition, license plate recognition, traffic statistics, trajectory tracking, behavior analysis, and image retrieval to effectively expand the capabilities of prevention and control of the system. Multi-purpose applications open up a wide range of sources of income, which is also required for its long-term stable operation.
Conclusion:
In recent years, video surveillance has become the main force in the development of the security industry, and more and more manufacturers have taken on video surveillance trains. Currently in the field of video surveillance, the trend of development is networked, high-definition, and intelligent. It is bound to have some problems among users. But video surveillance technology is not on the line, we can firmly believe that as the domestic video surveillance vendors deepen the understanding of the monitoring system, it will definitely put forward a complete solution, the development road will get better and better.