Where the function is intended for
Walls, roof edges, glass and spider silk can reflect infrared back to the camera. Therefore, the foreground becomes white while the relevant route remains dark.
advice
Evaluate Dahua night vision and reflections
A night image problem often isn't in resolution, but in light that bounces too close to the lens.
Setting or condition
Observe the image at night and note where the reflection occurs. Check the lens, casing, viewing angle, and objects directly in front of the camera before sensitivity or brightness changes.
Making a conscious choice
Adjust placement, angle, or environment so that the infrared remains further away from interfering surfaces. Choose additional lighting only when it fits the location and does not cause unnecessary inconvenience.
What you check afterwards
Compare the image before and after the change in the same darkness. Test recognition on the relevant path and check that the alerts do not increase due to insects or reflections.
Frequently asked questions
Why is my Dahua image overexposed at night?
Near-range infrared reflection is a common cause.
Does the lens always help clean?
It helps with dirt, but does not solve a wrong viewing angle or reflective edge.