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Automatic Gain Control (AGC)
- Apr 13, 2018 -

AGC - Abbreviation for Automatic Gain Control. All cameras have a video amplifier that amplifies the signal from COMS to a level that can be used. The amplification, or gain, is equivalent to having a high sensitivity, which makes it sensitive in low light, but in bright light. The amplifier in the environment will be overloaded, distorting the video signal. For this purpose, it is necessary to use a camera's automatic gain control (AGC) circuit to detect the level of the video signal and turn the AGC on and off in time so that the camera can operate within a large range of illumination, ie, the dynamic range, ie, The sensitivity of the camera is automatically increased in low light conditions to increase the intensity of the image signal to obtain a clear image. With AGC-enabled cameras, the sensitivity will be improved in low illumination, but the noise at this time will be more obvious. This is due to the simultaneous amplification of signal and noise.