基于视频的驾驶员心率测量方法的评估
Evaluation of a video-based measure of driver heart rate.
作者信息
Kuo Jonny, Koppel Sjaan, Charlton Judith L, Rudin-Brown Christina M
机构信息
Monash University Accident Research Centre (MUARC), Monash University, Australia.
Monash University Accident Research Centre (MUARC), Monash University, Australia.
出版信息
J Safety Res. 2015 Sep;54:55-9. doi: 10.1016/j.jsr.2015.06.009. Epub 2015 Jul 29.
INTRODUCTION
Internal driver events such as emotional arousal do not consistently elicit observable behaviors. However, heart rate (HR) offers promise as a surrogate measure for predicting these states in drivers. Imaging photoplethysmography (IPPG) can measure HR from face video recorded in static, indoor settings, but has yet to be examined in an in-vehicle driving environment.
METHODS
Participants (N=10) completed an on-road driving task whilst wearing a commercial, chest-strap style heart rate monitor ("baseline"). IPPG was applied to driver face video to estimate HR and the two measures of HR were compared.
RESULTS
For 4 of 10 participants, IPPG produced a valid HR signal (±5 BPM of baseline) between 48 and 75% of trip duration. For the remaining participants, IPPG accuracy was poor (<20%).
CONCLUSIONS
In-vehicle IPPG is achievable, but significant challenges remain.
PRACTICAL APPLICATIONS
The relationship between IPPG accuracy and various confounding factors was quantified for future refinement.
引言
诸如情绪唤起等内在驱动事件并不会始终引发可观察到的行为。然而，心率（HR）有望作为预测驾驶员这些状态的替代指标。成像光电容积脉搏波描记法（IPPG）可以从在静态室内环境中录制的面部视频测量心率，但尚未在车载驾驶环境中进行检验。
方法
参与者（N = 10）在佩戴商用胸带式心率监测器（“基线”）的同时完成一项道路驾驶任务。将IPPG应用于驾驶员面部视频以估计心率，并比较两种心率测量方法。
结果
在10名参与者中，有4名参与者在行程持续时间的48%至75%之间，IPPG产生了有效的心率信号（与基线相差±5次/分钟）。对于其余参与者，IPPG的准确性较差（<20%）。
结论
车载IPPG是可行的，但仍存在重大挑战。
实际应用
量化了IPPG准确性与各种混杂因素之间的关系，以便未来进行改进。
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