Privacy Protected Contactless Cardio-respiratory Monitoring Using Defocused Cameras During Sleep

Zhu Yingen1; Huang Jia2; Lu Hongzhou2; Wang Wenjin1

10.1109/Healthcom56612.2023.10472346

2023-12-17

979-8-3503-3765-5

2023 IEEE International Conference on E-health Networking, Application & Services (Healthcom)

15-17 Dec. 2023

Chongqing, China

The monitoring of vital signs such as heart rate (HR) and respiratory rate (RR) during sleep is important for the assessment of sleep quality and detection of sleep disorders. Camera-based HR and RR monitoring gained popularity in sleep monitoring in recent years. However, they are all facing with serious privacy issues when using a video camera in the sleeping scenario. In this paper, we propose to use the defocused camera to measure vital signs from optically blurred images, which can fundamentally eliminate the privacy invasion as face is difficult to be identified in obtained blurry images. A spatial-redundant framework involving living-skin detection is used to extract HR and RR from the defocused camera in NIR, and a motion metric is designed to exclude outliers caused by body motions. In the benchmark, the overall Mean Absolute Error (MAE) for HR measurement is 4.4 bpm, for RR measurement is 5.9 bpm. Both have quality drops as compared to the measurement using a focused camera, but the degradation in HR is much less, i.e. HR measurement has strong correlation with the reference (R ≥ 0.90). Preliminary experiments suggest that it is feasible to use a defocused camera for cardio-respiratory monitoring while protecting the privacy. Further improvement is needed for robust RR measurement, such as by PPG-modulation based RR extraction.

第一 ; 通讯

1.Department of Biomedical Engineering, Southern University of Science and Technology, China
2.ntensive Care Unit, The Third People’s Hospital of Shenzhen, China

Zhu Yingen,Huang Jia,Lu Hongzhou,et al. Privacy Protected Contactless Cardio-respiratory Monitoring Using Defocused Cameras During Sleep[C],2023.