1. Flare?
- Fare is a phenomenon in which a bright light source (sun, fluorescent lamp) enters a single point strongly between the general light sources entering the lens and is reflected on the inside, surface, and body tube of the lens, leaving a haze, polygonal/semicircle/circle afterimage on the image.
- Flare occurs in most cameras, and the angle at which fare occurs is different for each camera.
2. Flare Prevention Measures
- Location change : Avoid from strong incoming bright light sources
- Model change : Each camera has a different location and angle at which the flare occurs.
Thus, first test it with a model supporting similar specifications and then do model replacement.
- Others: lens coating, using a hood or using prime lenses
(difficult to apply to CCTV cameras )
3. Flare Market Cases
- Symptoms
1) A red circular afterimage occurs
2) The phenomenon occurs only at sunrise time every day
3) The same symptom occurs even after replacing the camera (same model).
- Installation Environment
1) The position where the sun and the camera face each other
2) The site conditions make it impossible to correct the position and angle.
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