How to identify noise in a captured image?
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Anitha Thomas
on 12 Jan 2019
Commented: Anitha Thomas
on 21 Jan 2019
How the noises are measured.FPN is the component of pattern noise measured in the absence of illumination. ie means every dark image will have FPN am i correct.
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Image Analyst
on 12 Jan 2019
In your case there are two noises: fixed pattern noise, and dark noise.
For fixed pattern noise, you remove the lens from the camera and hit the sensor with uniform illumination. Make sure the signal does not saturate. The image you get is the fixed pattern noise.
To determine dark noise, you cover the sensor by taping over the hole or putting the lens cap on and turning the room lights off. The image you get is the dark noise. You may also see fixed pattern noise in the image if the fixed pattern noise is pretty bad (like a dead pixel that is always lit up to 255 or something).
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