Lens Correction; Related Gige Vision Features; Figure 9: Lens Correction - Dalsa CALIBIR 640 GigE User Manual

Lens Correction

Some fixed pattern noise is also caused by the non-uniformity in the lens transmittance. This fixed
pattern noise cannot be corrected with a one point-calibration. To compensate for this non-
uniformity, a lens correction feature is available. To use it, the user selects the lens from the list of
available lenses. To be accurate, the lens temperature has to be stable and the one-point FPN
calibration has to be done at that lens temperature, otherwise this feature will amplify the non-
uniformity and changes in the lens temperature.
Lens correction = None Lens correction = F/1.2 8.5mm

Figure 9: Lens Correction

Related GigE Vision Features

The flatfieldCorrectionMode, flatfieldCalibrationFPN, flatfieldCalibrationSave and lensCorrection
features control the FPN correction and are part of the Image Processing Category.
30 • Features and Configuration Options Calibir 640 GigE IR Camera User's Manual