Noncontact SpO₂ Measurement Using Eulerian Video Magnification

A mHealth solution for contact-less self-monitoring of blood oxygen saturation

“…Moreover, very recent works are going to improve photoplethysmography techniques [26] by modifying existing RGB cameras to make them suited for near infrared remote photoplethysmography (NIR-PPG). In [27] SpO2 is measured by processing videos acquired by a camera. The videos are analyzed through the Eulerian video magnification (EVM) method to amplify the skin colour changes due to the cardiac cycle.…”

Contactless Vital Signs Monitoring From Videos Recorded With Digital Cameras: An Overview

“…Distances ranging between 0.5 m and 1.5 m from the user are employed, even if the most common is about 1 m (Kong et al, 2013;Guazzi et al, 2015;de Fatima Galvao Rosa and Betini, 2020), allowing the recording of the cardiac activity to retrieve the rPPG signal valuable for the estimation of the SpO 2 . Thirty fps is the most commonly used framerate since it is the typical value of the majority of the commercial camera, even if in some studies lower framerates have been used, such as 10 fps or 25 fps (Kong et al, 2013;Shao et al, 2016;de Fatima Galvao Rosa and Betini, 2020). Different from cameras used for estimating , 2017;Casalino et al, 2020).…”

“…The ROI used to extract the rPPG signal for the estimation of the SpO 2 is the facial region. Different sites can be used as ROI, like forehead, left cheek, right cheek, or the whole face (Bal, 2015;Qayyum et al, 2017;Casalino et al, 2020;de Fatima Galvao Rosa and Betini, 2020), and in one study, the region of the lips is considered as ROI to obtain the valuable rPPG signal (Shao et al, 2016). Once a ROI has been identified, the main approach used to extract the cardiac trace is based on the analysis of the intensity changes of pixels in the selected ROI.…”

Influence of cuff pressures of automatic sphygmomanometers on pulse oximetry measurements

“…The bi-level pulsed frequency-division excitation method, which relies on exciting two LEDs by bi-level pulse of 200 Hz and 400 Hz and synchronously obtaining a dual-wavelength photoplethysmogram by utilizing the digital demodulation algorithm, is described in [20] . Moreover noncontact SpO 2 measurement method based on imaging photoplethysmography and Eulerian video magnification, where the main carriers of information are the changes of skin color due to the heart cycle was presented in [21] .…”