What is network video surveillance? Network video surveillance is relative to analog surveillance and digital surveillance. In analog surveillance systems, the transmission, exchange, and storage of images are all based on analog signal processing techniques. Digital surveillance has introduced advanced digital signal processing technology to achieve digital storage, typically represented by DVR. The network monitoring is based on digital signal processing. It adopts a networked method to realize signal transmission, exchange, control, video storage, and on-demand playback. It also establishes a powerful central management platform (CMS) to implement all codec devices in the system. Unified management and centralized control of video storage devices. For users, only login to the central management platform can realize unified call, browsing and management of the entire network monitoring resources. Network video surveillance has realized end-to-end networking. The system architecture consists of IP front-ends, TCP/IP networks, central management platforms, network storage devices, video wall decoders, and clients.
The video server can be divided into two major categories: video encoder and video decoder. The video encoder is located at the front end of the network video surveillance system, while the video decoder is located at the user access end (or called the back end).
The video encoder is used to realize the digital compression and networking of front-end signals (video, audio and other signals). The specific functions include the access, encoding/compression, transmission of monitoring point analog video and audio information and alarm information, and peripheral devices (such as cameras). Cloud mirrors, matrices, etc.) The above information is processed by the video encoder and uploaded to the central management platform through the IP network, and then distributed by the central management platform to the client, the video decoder and the video storage device.
The biggest difference between a video encoder and a network camera is that the video source of the video encoder comes from an analog camera and needs to be used in conjunction with an analog camera. The network camera is integrated, and the analog video capture function is integrated in itself. From the current situation, although network cameras are emerging in large numbers, for the following two reasons, video encoders will still occupy an irreplaceable position in the network video surveillance system: First, a large number of analog and digital monitoring systems have been built In urgent need of network transformation, in order to protect the investment of existing analog cameras, these transformations will generate huge video encoder deployment requirements; second, the choice of network cameras is still far from analog cameras, and it is difficult to meet the needs of different users. Requirements, so many applications must be based on analog camera plus video encoder mode to achieve the front-end of the digital network.
The video decoder is used to receive the network video surveillance code stream forwarded by the platform under the control of the PC client, decode and output the analog signal to the peripheral equipments such as the TV wall and audio, and is usually deployed in the user's monitoring center. The difference between the video decoder and the PC client is that the video decoder is generally based on hardware decoding and displays the monitoring image through a dedicated display device, and the PC client directly displays the monitoring image through the PC display screen. As the PC client has more control and management functions, and the access is flexible and operational, the application of monitoring and browsing based on the PC client is becoming more and more common. However, because the video decoder is based on hardware and has stable performance and good image quality, it has very common meaning for many applications requiring centralized decoding on the wall.
The video server can be divided into two major categories: video encoder and video decoder. The video encoder is located at the front end of the network video surveillance system, while the video decoder is located at the user access end (or called the back end).
The video encoder is used to realize the digital compression and networking of front-end signals (video, audio and other signals). The specific functions include the access, encoding/compression, transmission of monitoring point analog video and audio information and alarm information, and peripheral devices (such as cameras). Cloud mirrors, matrices, etc.) The above information is processed by the video encoder and uploaded to the central management platform through the IP network, and then distributed by the central management platform to the client, the video decoder and the video storage device.
The biggest difference between a video encoder and a network camera is that the video source of the video encoder comes from an analog camera and needs to be used in conjunction with an analog camera. The network camera is integrated, and the analog video capture function is integrated in itself. From the current situation, although network cameras are emerging in large numbers, for the following two reasons, video encoders will still occupy an irreplaceable position in the network video surveillance system: First, a large number of analog and digital monitoring systems have been built In urgent need of network transformation, in order to protect the investment of existing analog cameras, these transformations will generate huge video encoder deployment requirements; second, the choice of network cameras is still far from analog cameras, and it is difficult to meet the needs of different users. Requirements, so many applications must be based on analog camera plus video encoder mode to achieve the front-end of the digital network.
The video decoder is used to receive the network video surveillance code stream forwarded by the platform under the control of the PC client, decode and output the analog signal to the peripheral equipments such as the TV wall and audio, and is usually deployed in the user's monitoring center. The difference between the video decoder and the PC client is that the video decoder is generally based on hardware decoding and displays the monitoring image through a dedicated display device, and the PC client directly displays the monitoring image through the PC display screen. As the PC client has more control and management functions, and the access is flexible and operational, the application of monitoring and browsing based on the PC client is becoming more and more common. However, because the video decoder is based on hardware and has stable performance and good image quality, it has very common meaning for many applications requiring centralized decoding on the wall.
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