General working principles in the field of video remote monitoring
First of all, it will come from video camera The video signal is input into the video capture terminal, and then the video capture terminal converts the video signal into a digital image of 25 frames/second through the image compression algorithm, and forwards the compressed audio and video data stream to the video monitoring center through the network; The monitoring computer in the video monitoring center decompresses the image and sound data received from the front end and monitors them in real time through the computer display screen and sound card.
When an alarm occurs, the alarm decoder will link the alarm output device, input the alarm signal to the video terminal through the alarm decoder, and transmit it to the monitoring center, the video of the monitoring center The server After receiving the alarm signal, sound signal will be sent immediately, alarm events will be recorded, hard disk recording and other alarm operations will be performed.
The camera control, deployment and other control signals are transmitted in the downlink. The monitoring host of the monitoring center sends out various control signals. After receiving the control signal, the video acquisition terminal passes through the pan tilt lens controller Or directly control the camera, or complete the deployment operation.
The system adopts the hardware compression software decompression technology, and the remote video monitoring function can be realized by adding the corresponding software on the computer terminal of the relevant department or through the Web function of the IE browser provided by Windows, which can be set as a video monitoring workstation.
TCP/IP and Multicast technologies are used for network communication, and the transmission performance and network bandwidth of the network are used to avoid network congestion.
The remote video monitoring system consists of the system sub station and the dispatching center master station. The system sub station is set up in subordinate coal mines, power plants, substations and other places that need monitoring. It is mainly composed of video acquisition terminals, computer network connection equipment, cameras, alarm probes, alarm decoders, etc., and is responsible for the collection and digitization of audio and video signals and alarm signals, The existing computer network is used to realize video/alarm information transmission and remote monitoring between stations and the dispatching center.
The main station of the monitoring and dispatching center is mainly composed of video management server, browser, computer network connection equipment, remote monitoring and video server software. The monitoring center can manage multiple acquisition stations through the network, and can switch and control to any monitoring point site to implement overall monitoring, so as to realize video monitoring of the entire region. Through the network, it can not only browse the live video of each monitoring point in real time, but also remotely access the video files of the collection station, download the video files, and record in the monitoring center.
The remote video monitoring system can generally adapt to different communication networks, and can be Ethernet, E1, WLAN or other transmission channels.
