McDuff Daniel, Gontarek Sarah, Picard Rosalind W
IEEE Trans Biomed Eng. 2014 Oct;61(10):2593-601. doi: 10.1109/TBME.2014.2323695. Epub 2014 May 14.
Remote measurement of the blood volume pulse via photoplethysmography (PPG) using digital cameras and ambient light has great potential for healthcare and affective computing. However, traditional RGB cameras have limited frequency resolution. We present results of PPG measurements from a novel five band camera and show that alternate frequency bands, in particular an orange band, allowed physiological measurements much more highly correlated with an FDA approved contact PPG sensor. In a study with participants (n = 10) at rest and under stress, correlations of over 0.92 (p 0.01) were obtained for heart rate, breathing rate, and heart rate variability measurements. In addition, the remotely measured heart rate variability spectrograms closely matched those from the contact approach. The best results were obtained using a combination of cyan, green, and orange (CGO) bands; incorporating red and blue channel observations did not improve performance. In short, RGB is not optimal for this problem: CGO is better. Incorporating alternative color channel sensors should not increase the cost of such cameras dramatically.
使用数码相机和环境光通过光电容积脉搏波描记法（PPG）进行血容量脉搏的远程测量在医疗保健和情感计算方面具有巨大潜力。然而，传统的RGB相机频率分辨率有限。我们展示了一种新型五波段相机的PPG测量结果，并表明交替频段，特别是橙色频段，能使生理测量结果与美国食品药品监督管理局（FDA）批准的接触式PPG传感器的相关性更高。在一项针对10名参与者在休息和压力状态下的研究中，心率、呼吸率和心率变异性测量的相关性超过0.92（p<0.01）。此外，远程测量的心率变异性频谱图与接触式测量方法的频谱图非常匹配。使用青色、绿色和橙色（CGO）波段组合可获得最佳结果；纳入红色和蓝色通道观测并不能提高性能。简而言之，RGB对于这个问题并非最佳选择：CGO更好。纳入替代颜色通道传感器不应大幅增加此类相机的成本。
