The image processing for reducing FPN (fixed pattern noise) has also been developed. UFPA having the responsivity in the narrow wavelength region, e.g., around 8 μm is appropriate for measuring the surface of glass. However, it suffers from severe FPN due to lower sensitivity compared with 8–13 μm. The developed image processing exploits the images of the shutter itself, and can reduce FPN significantly.
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Syuichi Ohkubo, Tetsuo Tamura, "IR camera system with an advanced image processing technologies," Proc. SPIE 9861, Thermosense: Thermal Infrared Applications XXXVIII, 986113 (8 June 2016);