AVIIVA® EM2-EM4
40
1013D - AVIIVA EM2/EM4 02/11
e2v semiconductors SAS 2011
•
FFC Adjust Function
: This Feature is available in the CommCam “Flat Field Correction/ Automatic
Calibration” section :
o
Gains adjust
(
FFCAdjust
)
:
Enable/Disable the function
Read function : “
r ffad
”. Returns the status of the function (0 if disabled)
Write function :
“
w ffad 0
” : Disable the FFC Adjust function.
“
w ffad 1
” : Enable the FFC Adjust function.
o
Auto Adjust Target Level
(
FFCAutoTargetLevel
)
:
set the value for the User Target.
Read function : “
r tfad
”. Returns the Target value (from 0 to 4095)
Write function : “
w tfad <value>
” : Set the Target Value (in 12bits)
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 reasonable value for the User Target is not more than around 20% of the max value of the line.
5.3.7.2
Automatic Calibration
•
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 : “
r calo
” : Returns the FPN Calculation Process Status (0 if finished, 1 if
processing)
Write function :
“
w calo 1
” : Launch the FPN Calibration Process.
“
w calo 0
” : Abort the FPN Calibration Process.
