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Features and Configuration Options
Calibir GXM640 IR Camera User's Manual
Saving Fixed Pattern Noise Calibration
After calibration, the FPN calibration coefficients can be saved to non-volatile camera
memory. When enabled, the FPN correction is applied in addition to the default factory
calibrated non-uniformity correction.
FPN Compensation Mode = Off
FPN Compensation Mode = Active
Figure 5: FPN Compensation Mode
Note: FPN correction is only valid at the operating temperature at which it was
calculated; the further the camera operating temperature is from the correction
point, the less accurate the correction.
Performing Manual FPN Correction With External Shutter
1.
With the camera at current operating temperature, expose the camera (with the
lens) to a scene of uniform temperature. For example, this can be done using an
object with a flat surface, ideally matte black and non-reflective, such as a metal
plate. This flat surface must not be in direct contact with the camera lens to avoid
heat transfer or reflection; leave a small gap between the surface and the lens so
they do not touch.
Flat surface with uniform temperature
Gap from
lens
Figure 6: Performing FPN Correction
