E2v UNiiQA+ CL Monochrome User Manual - page 26
CL Monochrome
UM UNIIQA+ Monochrome CL
– RevA – 12/2014
o
Auto Adjust Target Level (
FFCAutoTargetLevel
)
:
set the value for the User Target.
Read function (ASCII): “r tfad”. Returns the Target value (from 0 to 4095)
Write function (ASCII): “w tfad
FFC Adjust : A good usage.
When there are several Cameras to set up in a system on a single line, the most difficult is to have a uniform
lightning whole along the line.
If each Camera performs its own Flat field correction, relative to the max of each pixel line, the result will be a
succession of Camera lines at different levels.
=> The FFC Adjust function allows to set the same target value for all the Cameras in the system and then to get a
perfect uniform line whole along the system with a precision of 1 LSB to the Target.
The Maximum correction is x2 the highest value of the line.
The reasonable value for the User Target is not more than around 20% of the max value of the line.
7.7.2 Automatic Calibration
FFC Low Band Filter (
FFCAutoTargetLevel
)
:
set the value for the User Target.
Read function (ASCII): “r lffw”. Returns the Filter Interval size (from 0 to 32)
Write function (ASCII): “w lffw
0 : Disables the FFC Low Band Filter
1 to 32 : Set the interval size (+/- the value around the pixel) for the Low Band filter
When you can’t provide a moving Target to the Camera during the PRNU Calibration you can setup the FFC
Low Band Filter in order to remove the defect from the Target before calculating the FFC parameters. The Value
set in the FFC filter defined the size of the interval around each pixel : The Filter will replace each pixel value
by the average on the interval.
The FFC Low band filter is just an help to make in use the FFC (PRNU part) more easily : This can be done with a
non-moving white paper as its defaults will be filtered in order to not being taken in account in the PRNU
Correction.
Don’t forget to reset the filter (to “0”) after usage.
FPN/DSNU Calibration
:
o
FPN Calibration Control (
FPNCalibrationCtrl
) : Launch or abort of the FPN process for the Offsets
calculation. These commands are available in the CommCam “Flat Field Correction / Automatic
Calibration ” section :
Read function (ASCII): “r calo” : Returns the FPN Calculation Process Status (0 if finished, 1 if
processing)
Write function (ASCII):
“w calo 1” : Launch the FPN Calibration Process.
“w calo 0” : Abort the FPN Calibration Process.
o
FPN Coefficient Reset (
FPNReset
) : Reset the FPN (Offsets) coefficient in Memory. This command is
available in the CommCam “Flat Field Correction / Manual Calibration ” section :
Write function(ASCII) : “w rsto 0” : Reset (set to 0) the FPN coefficients in memory. This doesn’t
affect the FFC User Memory Bank but only the active coefficients in Memory.