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Thermal imaging techniques have been applied to detect and measure mental stress in polygraph screening and other applications. Mental stress is highly correlated with the activation of the corrugator muscle on the forehead. The vessels that supply blood to the corrugator muscle, proportionally to its degree of activation, are the supraorbital vessels. The rate of blood flow in these vessels can be...
Previous work demonstrated that facial thermography can be successful in lie detection. In those studies the development was based on the thermal signature of the periorbital region. In the present paper a new source of psychophysiological information is proposed: the forehead. We found that the corrugator muscle in the forehead is more active than usual, when the individual experiences sustained...
Following up on our previous work, we have developed one more non-contact method to measure human breathing rate. We have retrofitted our mid-wave infra-red (MWIR) imaging system with a narrow band-pass filter in the CO2 absorption band (4.3 mum). This improves the contrast between the foreground (i.e., expired air) and background (e.g., wall). Based on the radiation information within the breath...
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