1, there is dust in front of the camera lens, wipe it clean and try again.
2. Camera aging. Replace the camera. Or the internal aging parts.
3, there are objects near the front of the camera lens to reflect infrared light, so the whole picture is white and bright (for example, installed on the wall, the lens direction is too close to the wall). 4. There is no isolation between the internal lens and the infrared lamp part, resulting in infrared light hitting the lens and reflecting into the lens. Turn on the camera and try to isolate it. This suggestion asks the manufacturer how to operate the technology.
It is also related to the environmental impact, such as: cement road reflection infrared fiber can be better than mud road, night imaging is mainly by infrared reflection of light (and camera imaging chip is also related), if the night vision effect is not very good, you can replace the infrared light more cameras, improve the night imaging brightness, or enhance the camera grade! Hope I can help you!