Photon Focus MV1-D2080(IE) Series, Руководство пользователя, Страница: 98 / 119

6 Software
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:
1. The procedure to calibrate the offset correction (see Section 6.5.1) must be run just before
calibrating the gain correction.
Don’t turn off the camera between the calibration of the offset correction (Cali-
brateBlack) and the calibration of the gain correction (CalibrateGrey).
2. Illuminate the camera homogeneously to produce a gray image with an Average_Value (in
category PhotonfocusMain ) between 2200 and 3600 DN. Increase or decrease illumination if
Average_Value is outside this range. The property Average_Value can be updated by clicking
on the property Average_Update(in category PhotonfocusMain) .
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