Performing Calibration Of The Supplemental Fpn Correction Table; Related Gige Vision Features - Teledyne FLIR A68 Series User Manual

Performing Calibration of the Supplemental FPN Correction Table

When performing an FPN calibration with the internal shutter, some non-uniformities
can remain in the image. These are due to the distribution of heat in camera
components, such as the camera casing and lens, that are 'hidden' by the internal
shutter when it is closed. This distribution of heat is dependent upon the specific
operating conditions: camera mounting, air flow, etc.
The camera attempts to correct these non-uniformities through a supplemental FPN
table. This static table is factory-calibrated to provide a reasonably good correction in a
variety of operating temperatures; for optimal image quality in a specific environment,
this table can be recalibrated:
- First, make sure that the camera sees a flat surface with uniform temperature,
such as for an FPN calibration with an external shutter.
- Start image acquisition in the camera; ideally the camera should acquire images
for a certain period of time (for example, 10 minutes) to reach a stable
operating temperature.
- Write to the feature supplementalFPNCalibrate. This will trigger the calibration;
ensure that the flat surface stays in front of the camera for the duration of the
calibration.
- You can then set
calibration with the internal shutter by writing to the feature
flatfieldCalibrationFPN.
If the image quality is good, save the newly calibrated supplemental FPN table by
writing to the feature supplementalFPNSave.

Related GigE Vision Features

Feature related to control the FPN correction and are part of the FPN Correction
Category.
FLIR A68/A38 Series IR Camera User's Manual
shutterTarget to InternalAdvanced and perform an FPN
Features and Configuration Options • 43