Video surveillance storage technology development
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The development of signal and multimedia processing technology has led to a rapid revolution in video surveillance systems. Video surveillance systems have shifted from traditional analog CCTV surveillance to "analog-to-digital" surveillance. Until now, network video surveillance has experienced at least three generations of development. . Video surveillance storage technology has also undergone three major changes in VCR storage, DVR storage and current network storage.
In the era of traditional analog surveillance consisting of analog cameras, video recorders, etc., video surveillance images are stored as video tapes. However, because video tapes are easy to be lost, stolen or inadvertently deleted, and the video quality is not high, query operation and maintenance are difficult, so now Basically not used; "analog---digital" monitoring represented by analog cameras, DVRs, etc., that is, in the era of semi-digital surveillance, video surveillance images are digitally stored in DVRs, but the hard disks in these DVRs are not effective. Redundancy check, data security is difficult to guarantee, and capacity expansion is also difficult. In addition, the video stored in the DVR has limited definition, and can only save a relatively short period of time. The quality of the hard disk is uneven, and the specifications are different for the expansion and management. Therefore, the DVR storage also highlights its inherent defects; The network video surveillance represented by the camera, standard LAN/MAN/WAN/Internet network equipment, supervisory server, etc., the storage device can be stored in any place on the network and flexibly receive data of any monitoring point, and can realize centralized storage and concentration. Management, with strong flexibility and scalability, wide compatibility and high integration.
demand analysis
The demand for video surveillance storage in practical applications has also led to the continuous development of monitoring technology itself. Today's monitoring systems are developing in the direction of high definition, network, scale and intelligence. More and more cameras, the scale and scope of the monitoring system is getting bigger and bigger, the image clarity requirements are getting higher and higher, and the video storage period is getting longer and longer. It also means that the video surveillance storage system needs to have reliable storage of massive data. And efficient management capabilities to fully meet the user's requirements for monitoring clarity and real-time, and on the basis of the existing heterogeneous platform to achieve unified network management and accurate fault location, improve the level of intelligent management. The huge video performance pressure, huge data storage management pressure and massive data storage requirements have become the major problems that need to be solved in the current video surveillance storage market.
Traditional video surveillance storage devices use disk arrays to store video because of the small storage capacity, low definition, poor reliability, poor manageability, and poor scalability. Data has become a new trend to solve the storage problem of monitoring systems.
Many users' existing video surveillance systems may be in the form of "analog + digital" because of the increase in predictable monitoring points, the explosive growth of monitoring data, the increased performance pressure of existing monitoring systems, and the increase in management overhead. The third generation network video surveillance system transition, the solution first needs to build a unified video surveillance storage platform for users, a good unified monitoring platform is the basis for the realization of the monitoring system network.
The solution should be based on meeting the actual application needs of the user, and realize the system's easy deployment, high performance, high security, scalability and easy maintenance. Build a unified video surveillance storage platform and smoothly transition the system to the network video surveillance system. It is necessary to consider transforming the distributed DVR architecture that users may still be applying into a unified storage architecture without affecting the existing system network architecture; The management platform server is separated from the storage server to realize unified storage, unified management and maintenance of video surveillance data, better data protection and convenient extension; and professional video management platform software to intelligently manage and apply video data.
Design
1. The video information collected by the front-end analog camera is converted into a digital signal by an encoder and other devices, and then transmitted to the monitoring server through the monitoring network; the newly added network camera signal is directly transmitted to the monitoring server through the monitoring network.
2. The back end of the monitoring server is directly connected through the network cable or connected to the storage server through the Ethernet switch, that is, the video data is stored in the storage server through the monitoring server.
3. Install video management platform software on the monitoring server, call, alarm, switch and other application operations on video data, and support multiple people to view video data online via Ethernet. (The system architecture diagram is shown in Figure 1)
Disk array data storage features
1. Highly reliable data storage: The uniqueness, specificity, redundancy and various advanced data protection functions of each component enable professional disk arrays to have professional-grade high reliability and ensure that important video data is not lost.
2, efficient data management: video recording data unified management, flexible scheduling, to ensure efficient writing, query, reading and other operations, while having the best system stability.
3. High utilization of storage resources: Dynamically adjust SAN storage resources and improve resource utilization; storage space can be expanded infinitely to ensure the real restoration of massive video information.
4, convenient deployment and management: can achieve centralized storage and distributed storage, and achieve unified management results.
5, using professional disk arrays to store video data for higher performance: professional disk arrays use dedicated memory controllers and independent XOR check chips to implement RAID algorithms, improve data processing capabilities, and reduce access pressure. The front-end interface and the back-end disk channel provide enough bandwidth for a significant performance boost.
6. The disk array provides a high-security video storage environment: the disk array is a professional storage device, and its RAID algorithm data protection mechanism, disk hot backup function, online maintenance, and redundant power supply fan technology greatly improve the video recording storage. safety.
7, disk arrays provide a large amount of video storage space: disk arrays have unparalleled capacity and good scalability to meet the long-term video storage needs of thousands of channels of video.
Overall advantage of the program
The unified monitoring platform not only manages video data and devices, but also facilitates future system expansion. The system can achieve simple capacity expansion and linear growth of capacity and performance. In the process of capacity expansion, the monitoring system can run smoothly. , does not interrupt the running application.
The unified monitoring platform has high reliability and security. Through professional storage devices and various data protection methods, video data is not lost. At the same time, video management and device maintenance are greatly facilitated by centrally storing video data and monitoring management platform software. The advantages of the program can be summarized as follows.
1. Provide a large amount of storage space to store recordings of HDK rates of 2014Kb/s or above, and can support the transmission bandwidth of thousands of channels.
2. Effectively extend the storage time of video data and have good scalability, and establish a good foundation for the further development of the monitoring system in the future.
3, good performance matching, to meet the data storage requirements of the current monitoring system.
4. The video data is stored in a storage resource and is maintained in a unified manner. You can view the usage information, health status, and running status of the storage resources at any time.
5, using the most economical cost, on the basis of not changing the user's existing network topology, transforming, building a unified monitoring platform, rationally save storage costs, and maximize the use of investment value.
Conclusion
In summary, whether it is the user's own application requirements or legal and regulatory requirements, the video surveillance system will require more and more cameras, higher image resolution requirements, longer video storage deadlines, and monitoring network scale. Increasingly large, the requirements for surveillance video storage are becoming more and more demanding, that is, the surveillance video storage system requires high capacity, high performance, good data protection and convenient management and maintenance. The defects of traditional video storage and DVR storage methods are obvious. The storage space is insufficient, the performance pressure, the risk of video storage is high, and the management problems such as high centralized monitoring and poor stability of remote monitoring environment cannot be solved. The need for network surveillance to replace traditional video surveillance has become an inevitable trend.
Today, network video surveillance storage technology has also developed a variety of products for monitoring storage systems, such as NVR, disk arrays and so on. As a video surveillance storage product with full network architecture, NVR products have greatly superior to traditional video storage and DVR storage devices in terms of deployment, wiring, management, etc. However, as a video data storage device, all regulatory applications and image data are stored together. There is a lack of security compared to professional disk array storage. In addition, the resulting insufficient performance issues may result in frame dropping in the transfer storage process.
The above solution elaborates on the advantages of using professional disk arrays to store video surveillance data. The existing network video surveillance storage technology uses disk arrays to store video data, which is undoubtedly the most complete data storage solution of the current monitoring system, and solves the current monitoring system storage. The problem must depend on this mature technology.
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