“…Moreover, properties of the face depend on the temperature of the body, environmental conditions and occlusions present on the face such as scarfs, hairs, facial hairs, glasses or any disguise accessories that alter the emitted heat pattern. The image of a human face acquired in thermal infrared presents its unique heat-signature presenting thermal energy distribution and, as such, can be used for facial recognition [1]. An analysis of relative temperature distribution on the surface of a face can reveal individual patterns of heat variations and thus can give specific indicators of the subject's current state.…”