Lingqin Kong, Fei Chen, Yuejin Zhao, Liquan Dong, Ming Liu, Mei Hui. Non-Contact Psychological Stress Detection Combining Heart Rate Variability and Facial Expressions[J]. Acta Optica Sinica, 2021, 41(3): 0310003
- Acta Optica Sinica
- Vol. 41, Issue 3, 0310003 (2021)
Fig. 1. Process of the establishing a psychological stress assessment model
Fig. 2. Extraction flow chart of the non-contact HRV
Fig. 3. Signal diagram during HRV extraction. (a) Mean gray value; (b) pulse wave signal after processing; (c) timing diagram of R-R interval
Fig. 4. Diagram of the experimental setup
Fig. 5. Box plot of the HRV feature distribution. (a) Mean HR; (b) SDNN; (c) PNN50; (d) RMSSD; (e) NLF; (f) NHF; (g) XLF/XHF; (h) XSD2; (i) D2
Fig. 6. Box plot of the expression pressure value
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Table 1. Time domain analysis indicators of the HRV
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Table 2. Frequency domain analysis indicators of the HRV
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Table 3. Non-linear analysis indicators of the HRV
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Table 4. Results of the HRV
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Table 5. Results of training using HRV and facial expressions
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Table 6. Results of the comparative experimentsunit: %
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