After the HD-SDI was launched at the end of 2011, the IP network camera and the HD-SDI camera brought a market application complex to the video surveillance industry, and the media also applied the two in practical applications. The advantages and disadvantages are magnified to discuss. However, from the engineering pragmatic point of view, whether IP HD or HD-SDI or 960H, is the product technology form to improve the resolution and clarity of surveillance video. In the same purpose, the application is relatively consistent. Therefore, exploring how they achieve hybrid coexistence is the king of HD surveillance applications.
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First of all, through high-definition and high-resolution front-end, regardless of IP high-definition or SDI high-definition, its appeals are widely seen, and they are also demanding real-time and smooth, so there is no need to discard any possible offer in the application. HD video opportunities. But how do you implement these different types of cameras to coexist in the front end of the monitoring front?
If you want to open up a path of coexistence, you must first consider the architectural issues on the transmission of existing equipment. If the original system is a coaxial transmission system, it can be divided into two ways to solve the coexistence of the three types of cameras in the project. The first one is to use the transmission and reception unit of SLOC (Signal Link Over Coaxial) at the back end of the IP network camera, and use the principle mechanism of transmission and conversion to make the IP HD camera use the original under the structure of the traditional coaxial cable. The existing coaxial cable of the system can also provide TCP/IP signal and Video video signal output on the SLOC transmission device. The TCP/IP network signal can be input into the SLOC transmission device and then restored to the network signal to enter the network routing architecture. Video image video signals can be entered into existing analog image matrix or HD-SDI matrix system or digital video recorder DVR. In this process, it is also necessary to solve the problem of the transmission of the IP network camera in the traditional coaxial cable transmission, and also solve the problem that the main structure of the analog system cannot be replaced or the cable cannot be replaced. HD-SDI's SMPTE-292 broadcast signal can be transmitted on a traditional coaxial cable. Therefore, after receiving the SDI signal, the signal can be directly input into the HD (SDI)-DVR or matrix system. Thus, the system The architecture slides smoothly into HD and allows IP and SDI HD to coexist. If the existing analog camera or 960H high resolution camera is also included in the system, then under the same coaxial cable architecture, the 960H analog high solution and the general analog camera can be integrated into the same system through the DVR or matrix. It is not difficult. In fact, this kind of high-definition hybrid architecture is also the reference plan of many engineering companies, and it is also reflected in some practical cases.
The second is to set up the transmission system architecture as a TCP/IP network architecture. At this time, the IP network camera is the main architecture of the whole system. The non-IP HD-SDI HD and 960H analog high solution, and the general analog camera to be integrated into the same system must have a common operation mechanism in transmission and conversion to ensure Simultaneous operation with HD-SDI HD runs smoothly under a single monitoring system architecture. Then. How to do it? In my opinion, there are two methods: First, HD-SDI high-definition cameras in all systems are first assembled on HD (SDI)-DVR, and the TCP/IP signals output by DVR are compiled. Routing the network device, so that the video and video control and PTZ control of the HD-SDI camera can be performed through the CMS software or the browser of the DVR itself; then the HD is transmitted through the SDI-DVS image encoder. -SDI's camera letter directly uses the encoder Encoder to convert the signal into a TCP/IP signal. This is like an IP camera. Individual HD-SDI images can be turned into network signals for IP monitoring directly on the route. the way. As for the 960H analog camera, the principle is as follows: After the 960HDVR is acquired, it can be directly monitored and integrated by IP routing. In addition, the video signal can be directly converted into the TCP/IP mode by the image encoder DVS to conform to the network monitoring architecture. demand.
At this point, some projects may raise the transmission distance and the video format of the last one. Some readers have begun to question the compatibility between the 960H and HD-SDI signals on some transmission and containment devices, and even the screen display. Format issue. In addition, there are interchanges for backend unit formats and post-compressed parsing comparisons.
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