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The camera is the core equipment of the TV monitoring system. According to the user's requirements, reasonable selection is very important. Nowadays, TV surveillance systems for security precautions generally use CCD cameras because of their small size and light weight compared with vacuum tube cameras; low inertia; high sensitivity; good image uniformity; good impact resistance; long life. In actual engineering, if the illumination of the monitoring target is not high, and the user has high requirements for the sharpness of the surveillance image, a black and white CCD camera should be used; if the user requires color monitoring, it should consider adding an auxiliary lighting device, or use color � Black-and-white automatic conversion CCD camera, which automatically turns black and white when the target illumination cannot meet the color imaging requirements. 
1, resolution (resolution)
Represents the camera's ability to resolve image details, usually represented by a television line (TVL). It depends on the number of pixels of the CCD chip, the resolution of the lens, and the bandwidth of the camera system.
The horizontal resolution of black and white cameras generally needs to be around 450TVL. Considering the construction and other factors, the final clarity of the system can meet the 380TVL specified in China's industry standard GB/T16676-1996.
The horizontal resolution of a color camera generally needs to be greater than 350 TVL, because the human eye is difficult to distinguish the color, so the choice can also meet the requirements of the color monitoring system 270TVL in GB/T16676-1996.
2. Sensitivity The minimum target illumination required to obtain the specified signal level under the condition that the lens aperture size is constant. For example, when using the F1.2 lens, when the surface illumination of the object is 0.04Lx, the amplitude of the camera output signal is 350mV, which is 50% of the maximum amplitude. The sensitivity of this camera is 0.04Lx/F1.2. . If the surface illumination of the subject is low, the monitor screen will be a dark image that is difficult to distinguish. According to experience, the sensitivity of the selected camera is generally 1/10 of the illuminance of the surface of the subject.
3. Signal-to-noise ratio is the ratio of signal voltage to noise voltage. The typical value of the CCD camera signal to noise ratio is between 45 and 55 dB. Generally, about 50dB should be selected in the general TV monitoring system, which can not only meet the requirements of the system standard SNR of not less than 38dB, but more importantly, when the ambient illuminance is insufficient, the camera image with higher SNR will be more Clear.
4, working temperature -10 ~ +50 °C is the temperature index of most camera manufacturers. Depending on the temperature change in the area of ​​use, add protection or special protection.
5, power supply voltage foreign camera AC voltage adaptation range is generally 198 ~ 264V strong resistance to power supply voltage change; domestic camera AC voltage adaptation range is generally 200 ~ 240V, resistance to power supply voltage change is weak, generally used in the system Power Supply.
[ Huaqiang Security Network News ] How can I reduce the number of cameras when installing a TV monitoring system? At present, there are many camera manufacturers, and their brands, models and functions are different. Therefore, a reasonable choice of cameras, there is a direct relationship between the improvement of TV surveillance images, let's take a look at the camera selection skills! After determining whether to use a black and white camera or a color camera, the problem to be considered is the technical specifications of the camera. The main considerations are as follows.