提出一种抗干扰强的远程心率测量方法,适用于真实复杂环境。
A Robust Remote Photoplethysmography Method
- 结合数学变换提升信号稳定性
- 平均误差仅1.95次/分钟,优于以往方法
- 无需特殊设备,适合日常场景使用
远程光电容积脉搏波描记法(rPPG)是一种通过摄像头无接触测量心率的方法。受体动、光照变化、化妆等因素影响,观测到的脉搏信号易失真,现有方法多在理想条件下测试,实际应用中精度下降。本文提出一种更鲁棒的rPPG方法,仅需基本硬件,通过数学变换提取心率信号。实验基于19名不同性别和年龄志愿者的26段视频,与参考数据对比,平均绝对误差为1.95次/分钟,显著优于已有工作。该方法对运动和光照变化不敏感,可在不限制行为的前提下实现高精度远程心率监测。
原文摘要 · Abstract (English)
Remote photoplethysmography (rPPG) is a method for measuring a subjects heart rate remotely using a camera. Factors such as subject movement, ambient light level, makeup etc. complicate such measurements by distorting the observed pulse. Recent works on this topic have proposed a variety of approaches for accurately measuring heart rate in humans, however these methods were tested in ideal conditions, where the subject does not make significant movements and all measurements are taken at the same level of illumination. In more realistic conditions these methods suffer from decreased accuracy. The study proposes a more robust method that is less susceptible to distortions and has minimal hardware requirements. The proposed method uses a combination of mathematical transforms to calculate the subjects heart rate. It performs best when used with a camera that has been modified by removing its infrared filter, although using an unmodified camera is also possible. The method was tested on 26 videos taken from 19 volunteers of varying gender and age. The obtained results were compared to reference data and the average mean absolute error was found to be at 1.95 beats per minute, which is noticeably better than the results from previous works. The remote photoplethysmography method proposed in the present article is more resistant to distortions than methods from previous publications and thus allows one to remotely and accurately measure the subjects heart rate without imposing any significant limitations on the subjects behavior.
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