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PRNU Correction
Step 1. Apply illumination and place a white flat target in the spot where the real object will be.
Ideally, you would use a professional target. For convenience you can use white paper as the
target. However, the result of using paper may be the so-called grain effect—where visible vertical
lines show up in grabbed images.
There are two common ways to correct the grain effect: 1) keep the object moving while the PRNU
correction is performed. 2) Defocus the lens while the PRNU correction is performing and refocus
once it has completed.
Select
Off
from the Flat Field Correction Mode drop-down menu and check that the bare
image line profile is acceptable.
Step 2. Select
Calibration
Step 3. Select
Basic
down menu.
Step 4. Adjust the calibration target in the Flat Field Calibration Target (in DN) if necessary. 200
DN is a commonly used typical target. This target value can be higher or lower than the peak
values you observe from the bare image.
Step 5. Select
4096
Linea GigE Series Camera
Histogram of a dark image after FPN has calibrated.
from Flat Field Correction Mode drop-down menu.
(in general, otherwise select Low Pass Filter) from Calibration Algorithm drop-
or
2048
from Flat Field Calibration Sample Size drop-down menu.
Operational Reference • 71
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