Human Stress and StO2: Database, Features, and Classification of Emotional and Physical Stress

Figure 1. Experimental procedure.

Figure 2. Processing flow of HSI data. The box in the lower left part indicates that R, G and B bands can be extracted from the HSI cube to form an RGB image.

Figure 3. (a) The average standard face of 100 face images. (b) 65 facial key points for registration.

Figure 4. Illustration of seven selected ROIs.

Figure 5. Facial StO2 maps of six participants under (a) baseline and (b) emotional stress. (c) delta% represents the incremental percentage of facial StO2 under emotional stress.

Figure 6. Average facial StO2 value of seven ROIs under baseline and emotional stress.

Figure 7. Boxplot of average StO2 of ROIs of all participants under ES and baseline.

Figure 8. Delta score of M_StO2=ES-ES_baseline.

Figure 9. (a–c) Facial StO2 maps of six participants under physical stress. PS1 StO2 of the first three participants are lower than baseline StO2. (d,e) delta% represents the incremental percentage of facial StO2 under physical stress.

Figure 10. Average facial StO2 value of seven ROIs under baseline and physical stress. The left column represents PS1 StO2 lower than baseline StO2.

Figure 11. Boxplot of average StO2 of ROIs of all participants under PS and baseline.

Figure 12. Delta score of M_StO2 = PS1−PS_baseline, M_StO2 = PS2−PS1 and, M_StO2 = PS2−PS_baseline.