e2v ELIIXA+ 16K CXP COLOR, User Manual

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7.7 Flat Field Correction
Feature CXP @ R/W Size
in
bytes
Description
FFCEnable 0x08800 RW 4 0 : Disable Flat Field Correction (“False”)
- In user/integrator mode : the factory FFC bank is
written into the FPGA and the FFC stays enabled
1 : Enable Flat Field Correction (“True”)
FPNReset 0x08804 WO 4 0 : Reset FPN coefficients
PRNUReset 0x08808 WO 4 0 : Reset PRNU coefficients
FPNValueAll 0x10000 RW 64K Memory containing FPN
Format: S9.1 => -256..+255.5 step ½
Size=(CCDSize*2)*2 : (RedBlue Line + Green Line)
FPNValueSize Xml RO 2 Integer providing FPN value size in byte
PRNUValueAll 0x20000 RW 64K Memory containing PRNU
Format: U2.12 : Value from 0 to 4095
(1+coeff/1024) => x1..x4.999 step 1/1024
Size=(CCDSize*2)*2 : (RedBlue Line + Green Line)
PRNUValueSize Xml - 2 Integer providing PRNU value size in byte
FFCCalibrationCtrl 0x0880C RW 4 FFC calibration
- In Read Mode:
0 = finished
1 = running
- In Write Mode:
0 = Abort PRNU calibration by setting it to “Off”
(no effect if already stopped)
1 = Launch PRNU calibration by setting it to
“Once” (no effect if already launched)
FPNCalibrationCtrl 0x08810 RW 4 FPN calibration
- In Read Mode:
0 = finished
1 = running
- In Write Mode:
0 = Abort FPN calibration by setting it to “Off”
(no effect if already stopped)
1 = Launch FPN calibration by setting it to
“Once” (no effect if already launched)
LowFrequencyFilterWidth 0x08820 RW 4 Configure windows (width) around the pixel (+/- val)
0 : filter is disable
1-255 : nb pixels around the pixel to filter
How is performed the Flat Field Correction ?
What is the Flat Field correction (FFC) ?
The Flat Field Correction is a digital correction on each pixel which allows :

To correct the Pixel PRNU (Pixel Response Non Uniformity) and DSNU (Dark Signal Non
Uniformity)

To Correct the shading due to the lens

To correct the Light source non uniformity