OPERATING AND USER MANUAL Q-12 CoaXPress series
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Adimec
50
7.15 Dark field
Two independent dark field correction mechanisms are present in the camera, i.e.
DF_BlackClamp
and
DF_ColumnOffsetCorrection
.
7.15.1 DF_BlackClamp
| RW | E |
True
Enable the dark field black clamp. There will be 8 pixels on each side of the
image over the full sensor height that will appear dark. They are set to an
electrical dark reference. These pixels are used for a row wise correction;
they basically define for each row the black level. It will reduce row wise
noise. The usable image resolution reduces to 4080x3072.
False
Disable the dark field black clamp. The full sensor resolution 4096x3072
can be used for imaging.
NOTE:
By default DF_BlackClamp is true. When the black clamp is set to false please note that it is advised to
perform a new dark field column correction with the DF_Calibrate feature.
7.15.2 DF_ColumnOffsetCorrection
| RW | E |
True
Enable the dark field column offset correction. This correction compensates
for dark signal non-uniformities (DSNU) in between columns. This
correction is factory calibrated but can be re-calibrated in the field as well
with
DF_Calibrate
.
False
Disable the dark field column offset correction.
A column offset correction calibration has to be performed in dark. During calibration the camera uses
the internal timing generator to acquire images with an exposure time of 1 µs, the flash strobe output is
inactive during calibration. A user calibration is automatically saved to non-volatile memory. It is always
possible to restore to the factory calibrated correction.
Eight separate correction sets have to be stored for each
ProgrammableGainAmplifier
step (4 in total) in
both
SensorBitDepth
modes. The calibration is only performed for the active configuration.
7.15.3 DF_Calibrate
| WO | E |
Command
Start the dark field calibration of the camera. Perform this operation with no
illumination on the camera. The calibrated correction will automatically be
saved in the non-volatile memory.
NOTE:
During calibration the camera uses the internal timing generator to acquire images with an integration
time of 1 µs.
NOTE:
The flash strobe output is inactive during calibration.
7.15.4 DF_Status
| RO | E |
DF_CalibrateOK
The calibration is successfully finished and stored in non volatile memory.
DF_CalibrateError
An error occurred during calibration. A new calibration is required.
DF_SensorNotDark
The calibration could not be executed as the sensor is not dark.
This feature is automatically updated if any of the following features is changed:
DF_Calibrate
