
® 16k CL
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UM 16kCL – REVC – 11/14
e2v semiconductors SAS 2014
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.