66 Spyder 3 CL User's Manual
03-032-20008-00 DALSA
FPN will be observable in dark conditions and an incorrect FPN
value will be used during PRNU calibration resulting in
incorrect PRNU coefficients.
This algorithm is more robust and repeatable than algorithm 1
because it uses an average pixel value rather than a number
above target. However, this algorithm is slower.
i
Peak target value in a range from 1024 to 4055DN. The target
value must be greater than the current peak output value.
Notes:
• Perform all analog adjustments before calibrating PRNU.
• This command performs the same function as the
cpp
command but forces you to enter a target value.
• Calibrate FPN before calibrating PRNU. If you are not
performing FPN calibration then issue the
rpc (reset pixel
coefficients) command and set the
sdo (set digital offset)
value so that the output is near zero under dark.
Example:
cpa 1 600
Performing PRNU Correction to a Camera Calculated Value
Purpose: Performs PRNU correction and eliminates the difference in
responsivity between the most and least sensitive pixel creating a
uniform response to light.
Syntax
ccp
Notes:
• Perform all analog adjustments before calculating PRNU.
• Perform FPN correction before PRNU correction.
• If FPN cannot be calibrated, use the
rpc command to reset
all coefficients to zero, and save them to memory with the
wfc command. You can then adjust the digital offset (sdo
command) to remove some of the FPN.
• Ensure camera is operating at its expected analog gain,
integration time, and temperature.
• Refer to
Calibrating the Camera to Remove Non-
Uniformity (Flat Field Correction)on page
60 for a
procedural overview on performing flat field correction.
• To save FPN coefficients after calibration, use the
wpc
command. Refer to section
7.8 Saving and Restoring
PRNU and FPN Coefficients for details.
Related Commands:
ccf, cpa
To Next Page
Loading...
Need help?
General
