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纸质出版日期： 2020-11-16 ，
录用日期： 2020-08-21
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牛雪松, 韩琥, 山世光. 基于rPPG的生理指标测量方法综述[J]. 中国图象图形学报, 2020,25(11):2321-2336.
Xuesong Niu, Hu Han, Shiguang Shan. Remote photoplethysmography-based physiological measurement: a survey[J]. Journal of Image and Graphics, 2020,25(11):2321-2336.
远程光电容积脉搏波描记法(remote photoplethysmography，rPPG)是指通过摄像头等传感器来捕捉由心动周期造成的皮肤颜色周期性变化的技术。利用rPPG技术可以提取血液体积脉冲信号，进而测量心率、呼吸率和心跳变异性等心动周期相关的生理指标。近年基于rPPG的生理指标测量方法取得了飞速发展，准确性和鲁棒性已得到了大幅提高。该类技术的算法流程主要包括图像/视频的获取和感兴趣区域提取、血液体积脉冲信号提取和生理指标测量等步骤。基于这一算法流程，本文从算法所依据的假设或先验知识出发，对相关文献进行了总结和讨论。此外，还从评测任务、评测数据、评测指标及评测协议等4个方面系统整理针对基于rPPG的生理指标测量方法的评价体系。最后，本文讨论了该领域当前所面临的挑战并展望了可能的技术路线。
Physiological signals
such as heart rate (HR)
respiration frequency (RF)
and heart rate variability (HRV)
are important clues to analyze a person's health and affective status. Traditional measurements of physiological signals are based on the electrocardiography (ECG) or contact photoplethysmography (cPPG) technology. However
both technologies require professional equipment
which may cause inconvenience and discomfort for subjects. Remote photoplethysmography (rPPG) technology for remote measurement of physiological signals has progressed considerably and recently attracted considerable research attention. The rPPG technology
which is based on skin color variations due to the periodical optical absorption of skin tissue caused by cardiac activity
demonstrates high potential in many applications
such as healthcare
sleep monitoring
and defection detection. The process for rPPG-based physiological measurement can be divided into three steps. First
regions of interest (ROIs) are extracted from the face video. Second
blood volume pulse(BVP) signal is reconstructed from signals generated from the ROIs. Finally
the reconstructed BVP signal is used for physiological measurements. The reconstruction of the BVP signal is the key step for rPPG-based remote physiological measurements. A detailed review of methods for rPPG-based remote physiological measurement is presented in this study from the aspect of assumptions they use
which can be categorized into three kinds
i.e.
methods based on the skin reflection model
methods based on the BVP signal's physical characteristics
and data-driven methods. Studies on the skin reflection model-based methods can be further categorized into spatial skin and skin reflection models of different color channels. Studies on methods that using the BVP signal's physical characteristics can be further categorized into blind signal separation
manifold projection
low rank factorization
and frequency domain constraint. Studies on data-driven methods can be further categorized into methods based on hand-crafted features and deep learning. A detailed review of evaluations of different rPPG-based physiological measurement methods is also presented from the aspects of tasks
databases
metrics
and protocols. Evaluation tasks used for remote physiological measurement include average heart rate measurement
respiration frequency measurement
and heart rate variability analysis. Databases of rPPG-based physiological measurements are summarized according to database scale and variations. Evaluation metrics for remote physiological measurement can be categorized into statistics of error
correlation
and signal quality. Evaluation protocols for data-driven methods are summarized into fixed partition
subject-independent division
subject-exclusive division
and cross-database protocols. Finally
we discuss the challenges of the rPPG-based remote physiological measurement and put forward the potential research directions for future investigations. Challenges include video quality (i.e.
video compression and pre-processing of frames)
influence of subject's head movements
variations of lighting conditions
and lacking data. Future research trends include designing hand-crafted methods for different challenge scenarios and exploring technologies
such as self-supervised
semi-supervised
and weakly-supervised learning
for data-driven methods.
远程光电容积脉搏波描记法(rPPG)心动周期生理指标测量文献综述算法评测
remote photoplethysmography(rPPG)cardiac cyclephysiological measurementliterature surveyalgorithm evaluation
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