Informal experiments have been performed which lend credence to the hypothesis that facial thermograms can be of substantial value in detection of disguises and in positive identification of known individuals. Facial thermograms appear to be significantly more unique to an individual than standard photographs, and are also significantly less affected by illumination conditions. A program of formal experiments is suggested (1) to verify the hypothesis that thermograms constitute "facial fingerprints," and (2) to evaluate simple data extraction techniques for real-time automated identification of known individuals.
Francine J. Prokoski,
"Disguise Detection And Identification Using Infrared Imagery", Proc. SPIE 0339, Optics and Images in Law Enforcement II, (23 June 1983); doi: 10.1117/12.933650; https://doi.org/10.1117/12.933650