Spyder3 GigE Vision User’s Manual
DALSA 03-032-20027-02
53
correction wizard. For easy flat field correction, use the wizard located on the
Calibration tab.
Related Commands:
CorrectionCalibrateFPN,
CalculatePRNUAlgorithmTargetValue
CalculatePRNUAlgorithmTargetValue
• Perform all analog adjustments before calibrating PRNU.
• This command performs the same function as the
CorrectionCalibratePRNU command but forces you to
enter a target value.
• Calibrate FPN before calibrating PRNU. If you are not
performing FPN calibration then issue the
ResetPixelCoefficients (reset pixel coefficients)
command and set the
DigitalOffsetRaw (set digital offset)
value so that the output is near zero under dark.
• Note: Refer to Calibrating the Camera to Remove Non-
Uniformity (Flat Field Correction)on page 47 for a procedural
overview on performing flat field correction.
Subtracting Background
Use the background subtract commands after performing flat field correction if you want
to improve your image in a low contrast scene. It is useful for systems that process 8 bit
data but want to take advantage of the camera’s 12 bit digital processing chain. You
should try to make your darkest pixel in the scene equal to zero.
SubtractBackgroundSelector
Tap selection. All, Tap1 to Tap2 depending on camera model.
SubtractBackgroundRaw
Subtracted value in a range in DN from 0 to 4095.
• When subtracting a digital value from the digital video signal the output can no
longer reach its maximum. Use the
DigitalGainRaw command to correct for this
where:
ssg value=
maxoutputvalue
maxoutputvalue‐ssbvalue
Related Commands:
DigitalGainRaw
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