The wireless monitoring system has been widely used in the security field, but in the actual wireless monitoring system, there will still be insufficient image clarity when real-time monitoring occurs, which brings some troubles to playback, investigation and research. Therefore, the image quality in the wireless monitoring system is also an important indicator of a wireless monitoring system, and there are many reasons for affecting the image quality in the wireless monitoring system.
Several common reasons include the following:
1, the reason for the camera itself
The difference between a network camera and an analog camera is that the network camera not only captures images, but also compresses the images before transmitting them. The quality of the image is related to the choice of front lens, image sensor and compression chip.
The resolution of the network camera, the quality of the lens, and the adaptability of the system to low ambient illumination all have an impact on the image quality of the system. The higher the resolution of the camera, the sharpness of the image will definitely be much better, but the higher the definition, the higher the bandwidth requirements of the wireless monitoring device.
2, the quality of various cables
In the wireless monitoring system, the network cable is used, and the quality of the network cable directly affects the quality of the monitoring picture. At present, most cameras are high-definition, so the ordinary network cable is used to build a video surveillance system, and the signal attenuation will be large. Therefore, it is necessary to use more than five types of network cables for transmission, so as to ensure that the image quality of the front end is transmitted to the monitoring center without attenuation, and the stability of the video signal is ensured.
3, the quality of the wireless bridge
Since it is a wireless monitoring system, it requires a wireless network for wireless transmission. The most commonly used device is the wireless bridge. The high-performance wireless bridge can ensure the stable transmission of this video signal, without image delay, image and sometimes.
When selecting a wireless bridge, consider its anti-interference ability. If you choose a wireless bridge with poor anti-interference ability, the image signal may be affected by other electromagnetic waves during the transmission process, and the image quality will be affected.
When the wireless monitoring device transmits the front-end image, the bandwidth of the front-end camera must also be considered. If the front-end data is relatively large and the wireless bridge cannot meet the bandwidth requirements, then the image card, image pause, and sometimes the image may not appear. phenomenon.
4, the quality of the switch
The switch is easily overlooked. Many people think that the switch is only a data exchange function. It does not need any processing on the signal. It can be equipped with a switch, regardless of the configuration of the switch itself. This is an incorrect statement.
If the data of the front end is relatively large, you must consider the bandwidth of the backplane of the switch and the forwarding rate of the packet. If the switch does not meet the transmission requirements, data jam may occur after running for a period of time, resulting in failure to receive the signal from the front end.
5, the power supply voltage problem
All devices in the entire system require power to work. If the camera voltage is unstable, the image will appear rippled. The unstable voltage of the wireless bridge will cause the signal strength to weaken and the image to be unstable in some cases. The long-term impact will affect the service life of the wireless monitoring device. Therefore, we must ensure the stability of the power supply voltage.
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