光学学报, 2021, 41 (3): 0310003, 网络出版: 2021-02-28 复制并引用该论文  本文已被引 5 次  被引通知

图 & 表

图 1. 心理压力评估模型的建立过程

Fig. 1. Process of the establishing a psychological stress assessment model

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图 2. 非接触式HRV的提取流程

Fig. 2. Extraction flow chart of the non-contact HRV

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图 3. HRV提取程中的信号图。(a)灰度均值;(b)处理后的脉搏波信号;(c) R-R间期的时序图

Fig. 3. Signal diagram during HRV extraction. (a) Mean gray value; (b) pulse wave signal after processing; (c) timing diagram of R-R interval

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图 4. 实验装置图

Fig. 4. Diagram of the experimental setup

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图 5. HRV特征分布的盒形图。(a) Mean HR;(b) SDNN;(c) PNN₅₀;(d) RMSSD;(e) N_LF;(f) N_HF;(g) X_LF/X_HF;(h) X_SD2;(i) D₂

Fig. 5. Box plot of the HRV feature distribution. (a) Mean HR; (b) SDNN; (c) PNN₅₀; (d) RMSSD; (e) N_LF; (f) N_HF; (g) X_LF/X_HF; (h) X_SD2; (i) D₂

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图 6. 表情压力值的盒形图

Fig. 6. Box plot of the expression pressure value

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表 1HRV的时域分析指标

Table1. Time domain analysis indicators of the HRV

Index Definition Unit Meaning Mean HR the average number ofheartbeats per minute BPM reflect the heart beat rate PNN50 the heart rate of adjacent R-R intervalsgreater than 50ms as a percentageof all NN intervals % reflect the activity ofparasympathetic nerve SDNN ∑i=1N(XiRR-XRR-)2/(N-1) ms reflect the level that the heart ratevariability deviates from the average RMSSD ∑i=1N-1(Xi+1RR-XiRR)2N-1 ms measure the regulation effect ofparasympathetic nerve on heart rate

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表 2HRV频域分析指标

Table2. Frequency domain analysis indicators of the HRV

Index Definition Unit Meaning XVLF ultra low frequency power (≤0.04 HZ) ms2 related to body adjustment XLF low frequency power(0.04--0.15 HZ) ms2 reflect the activity of sympathetic nerve XHF high frequency power(0.15--0.4 HZ) ms2 reflect the activity of parasympathetic nerve NLF NLF=XLFXTP-XVLF×100% % standardized low frequency power,direct response to the activity ofsympathetic nerve.TP:total power NHF NHF=XHFXTP-XVLF×100% % standardized high frequency power,direct response to the activity ofparasympathetic nerve.TP:total power XLF/XHF power ratio of low frequencyband to high frequency band - reflect the balance of sympatheticand parasympathetic nerves PVLF peak point of ultra low frequency power Hz - PLF peak point of low frequency power Hz - PHF peak point of high frequency power Hz -

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表 3HRV的非线性分析指标

Table3. Non-linear analysis indicators of the HRV

Index Definition Unit Meaning XSD1 the standard deviation of thevertical line in the Poincaré chart ms related to sympathetic nerve activity XSD2 the standard deviation along themarked line in the Poincaré chart ms related to parasympathetic nerve activity D2 correlation dimension - reflect the heart's ability toadapt to the environment α1 short-term volatility slope in trend volatility analysis - - α2 long-term volatility slope in trend volatility analysis - -

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表 4HRV的结果

Table4. Results of the HRV

Name Normal Stress Mean HR /BPM 78.231 84.421 PNN50 /% 33.882 29.164 SDNN /ms 52.034 46.424 RMSSD /ms 38.623 33.862 XVLF /ms2 52.317 42.347 XLF /ms2 375.427 327.135 XHF /ms2 961.326 613.463 NLF /% 28.085 34.779 NHF /% 71.915 65.221 XLF/XHF 0.417 0.541 PVLF /Hz 0.039 0.039 PLF /Hz 0.110 0.117 PHF /Hz 0.285 0.297 XSD1 /ms 38.457 37.837 XSD2 /ms 41.626 31.976 D2 3.541 2.036 α1 0.668 0.636 α2 0.220 0.236

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表 5使用HRV与人脸表情训练的结果

Table5. Results of training using HRV and facial expressions

Model Kernel type Gamma C Accuracy /% SVM Gaussiankernel function 0.002 6.679 81.4

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表 6对比实验的结果

Table6. Results of the comparative experimentsunit: %

Method Accuracy HRV feature in Ref. [10] 65.1 HRV feature in ours 73.9 Expression 71.9 HRV & Expression 81.4

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孔令琴, 陈飞, 赵跃进, 董立泉, 刘明, 惠梅. 融合心率变异性与表情的非接触心理压力检测[J]. 光学学报, 2021, 41(3): 0310003. 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.