6 Software
6.5
Calibration of the FPN Correction
The following procedures can be most easily done with the PF_GEVPlayer.
6.5.1
Offset Correction (CalibrateBlack)
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 minimise the
static noise.
Procedure to achieve a good correction:
1.
Setup the camera width to the mode where it will be usually used. (Exposure time, ROI, ...)
Due to the internal structure of the camera, best performance of calibration will be
achieved when calibrating under "real conditions".
✎
If different ROI’s will be used, calibrate image under full ROI.
✎
If different exposure times will be used, calibrate the camera under the longest
exposure time.
2.
Set the following properties:
Gain
(in category
AnalogControl
) to 1,
DigitalOffset
(in
category
AnalogControl
) to 0,
DigitalGain
(in category
DataOutput
) to 1 and
Convolver_3x3_0_Enable
(in category
Convolver
) to 0. Due to the internal structure of the
camera these settings are required for correct calibration.
3.
Wait until the camera has achieved working temperature.
4.
Set the property
Correction_Mode
(in category
Correction
) to Off. This is not mandatory but
recommended.
5.
Close the lens of the camera.
6.
Check the value of the property
Average_Value
(in category
PhotonfocusMain
). Change the
property
BlackLevel
(in category
AnalogControl
) until
Average_Value
is between 240 and 400
DN. The property
Average_Value
can be updated by clicking on the property
Average_Update(in category PhotonfocusMain)
.
7.
Click on
CalibrateBlack
(in category
Calibration
). Wait until the command has been
finished, i.e.the property
Correction_Busy
(in category
Calibration
) is 0.
Correction_Busy
can
be updated by clicking on the property Correction_BusyUpdate (in category
Calibration
).
6.5.2
Gain Correction (CalibrateGrey)
The gain correction is based on a gray reference image, which is taken at uniform illumination
to give an image with a mid gray level. Gain correction is not a trivial feature. The quality of
the gray reference image is crucial for proper gain correction.
The calibration of the gain correction can be skipped if gain correction will not
be used.
Procedure to achieve a good correction:
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Summary of Contents for DR1-D1312(IE)-G2
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Page 8: ...CONTENTS 6...
Page 14: ...2 How to get started GigE G2 Figure 2 3 PFInstaller components choice 12...
Page 96: ...4 Functionality 94...
Page 122: ...6 Software 120...
Page 128: ...8 Warranty 126...
Page 130: ...9 References 128...
