Tong Chen,1 Peter Yuen,1 Kan Hong,1 Aristeidis Tsitiridis,1 Firmin Kam,1 James Jackman,1 David James,1 Mark Richardson,1 William Oxford,2 Jonathan Piper,2 Francis Thomas,3 Stafford Lightman3
1Cranfield Univ. (United Kingdom) 2Defence Science and Technology Lab. (United Kingdom) 3Univ. of Bristol (United Kingdom)
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Emotional or physical stresses induce a surge of adrenaline in the blood stream under the command of the sympathetic
nerve system, which, cannot be suppressed by training. The onset of this alleviated level of adrenaline triggers a number
of physiological chain reactions in the body, such as dilation of pupil and an increased feed of blood to muscles etc. This
paper reports for the first time how Electro-Optics (EO) technologies such as hyperspectral [1,2] and thermal imaging[3]
methods can be used for the detection of stress remotely. Preliminary result using hyperspectral imaging technique has
shown a positive identification of stress through an elevation of haemoglobin oxygenation saturation level in the facial
region, and the effect is seen more prominently for the physical stressor than the emotional one. However, all results
presented so far in this work have been interpreted together with the base line information as the reference point, and that
really has limited the overall usefulness of the developing technology. The present result has highlighted this drawback
and it prompts for the need of a quantitative assessment of the oxygenation saturation and to correlate it directly with the
stress level as the top priority of the next stage of research.
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Tong Chen, Peter Yuen, Kan Hong, Aristeidis Tsitiridis, Firmin Kam, James Jackman, David James, Mark Richardson, William Oxford, Jonathan Piper, Francis Thomas, Stafford Lightman, "Remote sensing of stress using electro-optics imaging technique," Proc. SPIE 7486, Optics and Photonics for Counterterrorism and Crime Fighting V, 748606 (24 September 2009); https://doi.org/10.1117/12.830485