Auto Gain Control automatically controls gains to keep the low illuminance characteristics of the image constant. 

In general, the color temperature varies from 3000(°)K to 7000(°)K depending on the camera installation location and the day and night time zone, which intensifies the color change of the monitor screen. To solve this problem, you can automatically balance the color with the AWB function to see a natural screen. 

Automatic Focus automatically adjusts the focus of the camera lens.

It usually focuses on the center of the screen. 

Automatic Exposure adjusts the shutter speed and the aperture value according to the light amount condition to obtain automatically appropriate exposure.