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. 2021 Jun 3;4:91. doi: 10.1038/s41746-021-00462-z

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — The graphical representation of the data collection process for rPPG approaches (mobile phone video) and the contact-based ground truth PPG (Masimo device) is shown in the left figure. The right figure depicts the actual data collection process showing the positioning of the ground truth Masimo device on the left hand and the subject facing the mobile phone camera in an upright position (faces blurred to maintain anonymity).