Video surveillance is an important guarantee for urban security and plays a crucial role in the construction of safe cities, digital cities, and even smart cities. At the 2nd Academic Forum on Smart Cities and Intelligent Systems held in Hong Kong on March 24 this year, Academician Gao Wen combined the development process and challenges of monitoring video processing technology, and proposed its application and prospects in the field of surveillance video processing technology. The forward-looking point of view, obtained by highly-recognized video transmissions from participating academicians, experts, and industry insiders, the most common failure phenomenon is the appearance of a black bar or a white bar on the monitor screen, and either slowly upwards or downwards. scroll. Therefore, when analyzing such failure phenomena, two different causes of failures must be distinguished. To distinguish between power supply problems and ground loop problems, an easy way is to connect only one camera power output signal with no power problem to the control host. If the above interference does not occur on the monitor , then there is no problem with the control host.
Next, a portable monitor can be connected nearby to the video output of the front camera and each camera can be checked one by one. If yes, handle it. If not, the interference is caused by ground loops and other causes.
The fault caused by the short circuit and open circuit of the core wire of the video cable and the shield network. This failure manifests itself in a deep and chaotic large-area moire on the monitor, so that the image is completely destroyed and the image and synchronization signals cannot be formed. This happens mostly on BNC connectors or other types of video connectors. That is, when this kind of fault phenomenon occurs, it is not always the signal of the entire system that causes problems, but only appears in the number of poorly-connected paths. As long as you carefully check these joints one by one, you can solve.
The failure phenomenon due to the mismatch of the characteristic impedance of the transmission line. The manifestation of this phenomenon is that a number of vertical bars of equal spacing are generated on the screen of the monitor, and the frequency of the interference signal is substantially an integral multiple of the line frequency. This is due to impedance mismatch caused by the characteristic impedance of the video transmission line is not 75Ω. It can also be said that this interference phenomenon is caused by the fact that the characteristic impedance and distribution parameters of the video cable do not meet the requirements. The solution to this problem is usually solved by means of "connected resistors at the beginning" or "connected resistors at the terminals". In addition, it is worth noting that when the video transmission distance is short (usually within 150 meters), using the above video cable with impedance mismatch and excessive distribution parameters does not necessarily cause the above-mentioned interference phenomenon. The fundamental solution to the above problem is to ensure quality when purchasing video cables. When necessary, the cable should be sampled and tested.
Next, a portable monitor can be connected nearby to the video output of the front camera and each camera can be checked one by one. If yes, handle it. If not, the interference is caused by ground loops and other causes.
The fault caused by the short circuit and open circuit of the core wire of the video cable and the shield network. This failure manifests itself in a deep and chaotic large-area moire on the monitor, so that the image is completely destroyed and the image and synchronization signals cannot be formed. This happens mostly on BNC connectors or other types of video connectors. That is, when this kind of fault phenomenon occurs, it is not always the signal of the entire system that causes problems, but only appears in the number of poorly-connected paths. As long as you carefully check these joints one by one, you can solve.
The failure phenomenon due to the mismatch of the characteristic impedance of the transmission line. The manifestation of this phenomenon is that a number of vertical bars of equal spacing are generated on the screen of the monitor, and the frequency of the interference signal is substantially an integral multiple of the line frequency. This is due to impedance mismatch caused by the characteristic impedance of the video transmission line is not 75Ω. It can also be said that this interference phenomenon is caused by the fact that the characteristic impedance and distribution parameters of the video cable do not meet the requirements. The solution to this problem is usually solved by means of "connected resistors at the beginning" or "connected resistors at the terminals". In addition, it is worth noting that when the video transmission distance is short (usually within 150 meters), using the above video cable with impedance mismatch and excessive distribution parameters does not necessarily cause the above-mentioned interference phenomenon. The fundamental solution to the above problem is to ensure quality when purchasing video cables. When necessary, the cable should be sampled and tested.
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