Spyder3 GigE Vision User Manual
03-032-20027-02 DALSA
50
Digital Signal Processing
To optimize camera performance, digital signal processing should be completed after any
analog adjustments.
FPN Correction
Performing FPN Correction
Performs FPN correction and eliminates FPN noise by subtracting away individual pixel
dark current.
CorrectionCalibrateFPN
• Perform all analog and digital adjustments before performing FPN correction.
• Perform FPN correction before PRNU correction.
• 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 WriteFPNCoefficients
command.
• 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.
Related Commands:
CorrectionCalibratePRNU, WriteFPNCoefficients
Setting Digital Offset
Purpose:
Sets the digital offset. Digital offset is set to zero when you perform FPN correction
(CorrectionCalibrateFPN
command). If you are unable to perform FPN correction,
you can partially remove FPN by adjusting the digital offset.
DigitalOffsetSelector
Tap selection. All, Tap1 or Tap2 depending on camera model.
DigitalOffsetRaw
Subtracted offset value in a range from 0 to 2048
• When subtracting a digital value from the digital video signal, the output can no
longer reach its maximum unless you apply digital gain using the DigitalGainRaw
command. See the previous section for details on the DigitalGainRaw command.
Related Commands:
DigitalGainRaw
PRNU Correction White Balance
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