Camera definition selection:
The definition of the camera is generally 420 lines for civilian use, 480 lines, 520 lines, 600 lines, and 700 lines are the majority. The more lines, the clearer. The number of lines represents the sharpness of the camera, that is, the number of lines scanned horizontally on the monitor. Generally, above 600 lines are represented as high-definition cameras. There are many false labels on the market. Some labels are 700 lines, but only 500 lines. The difference is a lot. We often have actual tests as the standard. Using an ordinary TV face, the clarity can be seen.
How to choose the focal length:
When choosing the focal length of monitoring equipment, you actually choose the monitoring angle of view, and the length of the focal length will affect the size of the angle of view. Of course, the current market also has zoom lens monitoring equipment, but the price of zoom lens equipment is relatively high, so you must consider your actual budget when purchasing products. If the monitoring environment is relatively empty (such as a long corridor, corridor, etc.), the user needs to choose a monitoring device with a larger focal length according to the actual monitoring distance; if the monitoring area is a relatively small environment such as an elevator, choose a small focal length lens (ie Wide-angle lens).
Choice of camera interface:
Cameras on the market now generally use BNC connectors. Recently, the network interface is popular. The RJ45 interface is transmitted through a network cable. It is an ultra-high-definition camera, but the price is higher. According to our surveillance needs, select cameras with different functions.
The transmission method, we can choose, video cable transmission, network cable transmission, WiFi transmission, wireless AP transmission, 4G mobile network transmission and other different transmission methods of the camera.
Audio function:
If we are monitoring the picture, we need to monitor the sound. Then we have to choose a camera with audio function. In different light environments, if the camera is installed indoors, it needs to be illuminated from the door or window to the outside. Because the light inside and outside is different, you need to choose a camera that supports wide dynamic functions. If you need to illuminate and see the car license plate clearly at night, because the car's headlights are very bright, you need to use a camera that supports strong light suppression.
