Photon Focus MV1-D1024E Series User Manual page 91

Calibration
Offset (FPN), Hotpixel Correction: The offset correction is based on a black reference image,
which is taken at no illumination (e.g. lens aperture completely closed). The black
reference image contains the fixed-pattern noise of the sensor, which can be subtracted
from the live images in order to minimize the static noise. Close the lens of the camera.
Click on the Validation button. If the Set Black Ref - button is still inactive, the average of
the image is out of range. Change to panel Charateristics and change the Property
BlackLevelOffset until the average of the image is between 160 and 400DN. Click again
on the Validation button and then on the Set Black Ref Button.
If only offset and hot pixel correction is needed it is not necessary to calibrate a
grey image. (see Calculate)
Gain Correction: The gain correction is based on a grey reference image, which is taken at
uniform illumination to give an image with a mid grey level.
Gain correction is not a trivial feature. The quality of the grey reference image
is crucial for proper gain correction.
Produce a grey image with an average between 2200 and 3600DN. Click on the Validation
button to check the average. If the average is in range, the Set Grey Ref button is active.
Calculate: Calculate the correction values into the camera RAM. To make the correction values
permanent, use the 'Save to Flash' button.
Save to Flash: Save the current correction values to the internal flash memory.
This will overwrite the factory presets.
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