[Problem phenomenon]
When the infrared effect is bright in the middle and dark around it, the phenomenon is more like a flashlight shining out, as shown in the figure below.

【problem causes】
Due to the divergent nature of the infrared lamp, the brightness of the center itself will be higher than the surroundings. In addition, there are multiple sets of infrared lamps with different angles, so the center brightness will be significantly higher.

1. The angle of the additional infrared light is significantly smaller than the field of view of the camera lens

2. The infrared brightness in the center of the picture is very strong, the "anti-infrared overexposure" mechanism makes the entire brightness drop, and the center will be highlighted

[Corresponding solution]
1. Use a reasonable angle infrared fill light

2. Turn off the "anti-infrared overexposure" function to improve the overall brightness of the screen