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. 2017 Aug 2;17(8):1776. doi: 10.3390/s17081776

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Selected regions of interest: (a) Forehead (F); (b1,b2) Cheeks (C); (c) Neck (N). Some details are blurred to preserve the subject’s privacy. The ROIs are selected considering the percentage of the detected face area shown in the figure.