Figure 16: Radiometric Offset Correction Feature; Figure 17: Temperature Accuracy (25°C & 40°C Target Objects) Using 35°C External - Teledyne FLIR A68 Series User Manual

This value can then be applied to the camera; set the Radiometry Offset Correction
Mode to Manual, then set the value of "Radiometry Offset Correction"
(radiometryOffsetCorrection) to the computed offset value (typically a negative value).

Figure 16: Radiometric Offset Correction Feature

Offset Correction: Automatic Mode
Since most error sources manifest as a global temperature offset, having a known
temperature source from a blackbody radiator as part of the scene provides a
reference to dynamically correct any offset error caused by changing conditions around
the camera during operation. This allows reaching a temperature accuracy close to that
of the blackbody used as the reference.
Figure 17: Temperature Accuracy (25°C & 40°C target objects) Using 35°C External Reference (IEC80601-
2-59 requirements)
FLIR A68/A38 Series IR Camera User's Manual Features and Configuration Options • 55