® 8k/4k CL
34
UM 8k/4k CL – REVA – 01/13
e2v semiconductors SAS 2013
6.3.5.1
Activation and Auto-Adjust
•
FFC Activation
(
FFCEnable
) : Enable/disable the Flat Field Correction
.
This command is available in the
CommCam “Flat Field Correction” section :
Read function : “
r ffcp
” : Returns the FFC Status (0 if disabled, 1 if enabled)
Write function :
“
w ffcp 1
” : Enable the FFC.
“
w ffcp 0
” : Disabled the FFC
•
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 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.
