Photon Focus Luxima DR4-D1280-L01-FB, User Manual, Page: 76 / 151

12 Pixel Data Processing
5. Run the command ColCorrection_Update by clicking on the corresponding button. Read the
ColCorrection_Busy value which should be 0 after the calibration has finished. Repeat this
step if its value is not 0. If the ColCorrection_Busy value doesn’t show 0 after various tries,
check if the camera receive triggers, when the triggered mode is activated.
6. Check the values of the properties
ColCorrection_Overflow
and
ColCorrection_Underflow
. Both
should have the value 0 after calibration. If
ColCorrection_Overflow
is not 0, then decrease
BlackLevel
(in category
AnalogControl
) and re-run the procedure from step 4 on. If
ColCorrection_Underflow is not 0, then increase BlackLevel (in category AnalogControl ) and
re-run the procedure from step 4 on.
7. The Column FPN correction is now calibrated. The calibration values are stored in the
camera’s RAM and these values are lost when the camera power is turned off. To store the
calibration values to permanent memory see Section 12.3.3.
12.3.3 Storing the calibration in permanent memory
After running the calibration procedure (see Section 12.3.2) the calibration values are stored in
RAM. When the camera is turned off, their values are lost.
To prevent this, the calibration values must be stored in flash memory. This can be done by
clicking on the property
ColCorrection_SaveToFlash
(in category
ColCorrection
). Wait until the
command has been finished, i.e.the property
ColCorrection_Busy
(category
Correction
/
ColCorrection ) is 0. ColCorrection_Busy can be updated by clicking on the property
ColCorrection_Update (in category Calibration ).
Storing the calibration in permanent memory overwrites the factory calibration.
12.4 Gain and Offset
There are three different gain settings on the camera:
Analog Gain Analog gain on the image sensor. Available values: x1.375, x4.0, x8.0 and x16.0.
Note that Digital Offset is applied after the Analog Gain .
Gain (Digital Fine Gain) Digital fine gain accepts fractional values from 0.01 up to 15.99. It is
implemented as a multiplication operation. Colour camera models only: There is
additionally a gain for every RGB colour channel. The RGB channel gain is used to
calibrate the white balance in an image, which has to be set according to the current
lighting condition.
Digital Gain Digital Gain is a coarse gain with the settings x1, x2, x4 and x8. It is implemented
as a binary shift of the image data where ’0’ is shifted to the LSB’s of the gray values. E.g.
for gain x2, the output value is shifted by 1 and bit 0 is set to ’0’.
The resulting gain is the product of the three gain values, which means that the image data is
multiplied in the camera by this factor.
Digital Fine Gain and Digital Gain may result in missing codes in the output im-
age data.
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