Spyder3 GigE Vision User Manual
03-032-20027-02 DALSA
52
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.
• The QuickCam software that ships with the Spyder3 GEV
camera has a flat field correction wizard. For easy flat field
correction, use the wizard located on the Calibration tab.
• Only algorithm 2 is available for the 4k camera models.
CalculatePRNUAlgorithm = Peak target value in a range from
1024 to 4055DN
Note: Algorithm for this feature is preset to 2.
4k model
CalculatePRNUAlgorithmTargetValue = Peak target value in
a range from 1024 to 4055DN
CalculatePRNUCoefficients = Executes the command.
Performing PRNU Correction to a Camera Calculated Value
Performs PRNU correction and eliminates the difference in responsivity between the most
and least sensitive pixel creating a uniform response to light.
CorrectionCalibratePRNU
• Perform all analog adjustments before calculating PRNU.
• Perform FPN correction before PRNU correction.
• If FPN cannot be calibrated, use the
ResetPixelCoefficients command to
reset all coefficients to zero, and save them to memory with the
WriteFPNCoefficients
command. You can then adjust the digital offset
(
DigitalOffsetRaw 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 47 for a procedural overview on performing flat field
correction.
• To save FPN coefficients after calibration, use the WritePRNUCoefficients
command. Refer to section Saving and Restoring PRNU and FPN Coefficients for
details.
• The QuickCam software that ships with the Spyder3 GEV camera has a flat field
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