Applies to: All Zosi cameras
Description of the phenomenon: The camera can't see the license plate at night at all. The license plate at night turns into a white sequin or the license plate is overexposed in infrared mode.
Cause: The coatings used in license plates, traffic sign plates, and special work clothes all contain retro reflective materials. The characteristic of retro reflectivity is that when light is irradiated, the reflected light will be reflected toward the light source from the opposite direction close to the incident light. This is to clearly identify people and objects with retro reflective materials in the distance at night or when the vision is poor, which plays a major role in ensuring traffic safety and other fields.
Camera night monitoring mainly relies on the diffuse reflection of infrared light / white light from the object. After turning on the infrared light / white light, the infrared light / white light will irradiate the license plate, and it will be directly reflected from the license plate back to the lens, causing the license plate to appear as white sequins in the output image.
Note: This is a normal phenomenon, and all cameras will have this situation under night vision when the built-in infrared lights are turned on.
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