As an effective security precaution, the role of video surveillance is mainly concentrated in three aspects: one is early warning, which can analyze abnormal conditions and give an alarm; the second is real-time browsing, which can transmit real-time monitoring point images for users to browse; Event backtracking can store surveillance images and provide storage resources on demand.
Among them, event backtracking is the most common and most important in current video surveillance applications, because in reality, users are more likely to track back the scene by playing back surveillance images after the event. Therefore, the effective storage of the surveillance point images is a very important part of the video surveillance system.
Thanks to the continuous warming of network video surveillance construction in recent years, the storage market for video surveillance has also grown significantly. Analysys International analysis data shows that the market value of storage systems for video surveillance reached 470 million yuan in 2006, and in 2007, as operators, governments, and other industries accelerated the deployment of video surveillance, The market value of storage systems will reach 680 million yuan, with an annual growth rate of around 45%.
Storage development in the field of video surveillance
The development of storage in the field of video surveillance is closely related to the development of video surveillance itself. Video surveillance has experienced three stages: analog, digital, and network. Applications stored in the field of video surveillance have also experienced three stages: analog, digital, and network.
Analog video surveillance originated in the 1980s. Image acquisition, transmission, and display are based on analog devices, and image storage is also based on analog devices, that is, video tape recorders (VCRs). Due to the use of video tapes, on the one hand, the storage capacity is greatly limited, on the other hand, image retrieval is very cumbersome, and remote calling cannot be achieved. In addition, there are obvious defects in terms of preservation time and system maintenance.
In the late 1990s, digital video monitoring based on digital signal processing (DSP) gradually became popular, and various codec technologies have been widely used in image processing. The processed images can also be transmitted in the form of digital code streams. The storage has also begun to enter the digital era. The most typical application is a digital hard disk recorder (DVR), which uses an internal hard disk for image storage. This storage method has fundamental changes in storage time, image retrieval, system maintenance, and remote recall. However, because most of the digital video surveillance systems at this stage have obvious localization characteristics and relatively small scale, storage also shows obvious front-end and stand-alone characteristics.
In recent years, with the rapid development of information network technology, networked video surveillance systems that are centrally managed and controlled through a central business platform, with network video servers and IP cameras as the front end, have begun to be widely deployed. Due to a reasonable architecture, flexible expansion, and clear layers, network video surveillance can bring users a new security application experience, thus quickly becoming the main form of building a new generation of video surveillance systems. The distributed front-end and platform architecture, centralized management and control, and flexible and convenient user access have made the storage part of the network video surveillance system begin to be networked. Networked storage brings a new storage architecture to video surveillance. On the one hand, users are more flexible in storage deployment and access is simpler. On the other hand, it is also more convenient to build a video surveillance system that requires mass storage.
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