Analysis of network video surveillance applicationReading number of times [241] Time :2010-2-26
As an effective means of security, the role of video surveillance focused on three aspects: First, early warning, to analyze abnormal conditions and make the police; two real-time browsing, be able to transmit real-time monitoring of point image for the user browsing; third is the event back, able to monitor the image is stored and provide storage resources on-demand call.Among them, the incident back in the current video surveillance applications, the most common and most important, because the reality, the user is more of after the incident through the playback monitor the images to trace the scene at that time. So, to carry out effective monitoring points, the image is stored in video surveillance system a very important part.
In recent years, thanks to the construction of network video surveillance continues to heat up, facing the video surveillance storage market also received a substantial growth. Analysys International data show that in 2006 for video surveillance storage systems market value of 4.7 billion, while in 2007, with the operators, government and other industries to accelerate the deployment of video surveillance, for video surveillance storage systems market will be worth 6.8 billion yuan, an annual growth rate of 45% or so.
Is stored in the video monitor developments in the field
Is stored in the video surveillance and video monitoring of developments in the field of development itself, are closely linked. Video surveillance through analog, digital, network in three phases, is stored in the field of video surveillance applications also experienced analog, digital, network these three stages.
Analog video surveillance originated in the 80s of last century, image collection, transmission and display are based on analog devices, image storage is also based on analog devices, that is, the tape recorder (VCR). As the use of the videotape, while storage capacity is considerably limited, on the other image retrieval is very cumbersome, but also remote call can not be achieved, In addition, to save time, system maintenance, etc. There are also obvious flaws.
90 end of the decade, based on digital signal processing (DSP) of digital video surveillance gradually began to spread all kinds of encoding and decoding technology in image processing to obtain a wide range of applications processed images can also be a way in digital bit stream for transmission, image of storage has also begun to enter the digital era. The most typical application is digital hard disk video recorder (DVR), using the built-in hard drive the way the image is stored. This is stored in the storage time, image retrieval, system maintenance and remote calls aspects of the fundamental changes. However, due to this phase of the digital video surveillance system with a clear majority of the localization characteristics of scale is relatively small, so storage also showed significant front-end technology and stand-alone Feature.
Source: Projection Age