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. 2020 Jun 8;11:2868. doi: 10.1038/s41467-020-16642-6

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© The Author(s) 2020

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. 6 — a Schematic illustration of the self-powered identity recognition system. There will be three states displayed on the screen, i.e., “√”, “×”, and “×” accompanied by an alarm indicator. b Schematic illustration of the human walking trajectories on the identity recognition carpet. The magenta, blue, and brown dotted lines represent the walking routes of the whole person, the left foot, and the right foot, respectively. Moreover, the small blue and brown foot symbols refer to the left foot and the right foot, respectively. c, d Schematic illustrations of (c) the set password path and (d) the real-time walking path. e–g Real-time walking trajectories on the identity recognition carpet, which correspond to the path with (e) the correct password, (f) the incorrect password for the first time, and (g) the incorrect password for more than three consecutive times when evaluated against the set password path. The voltage signals of 64 sensing blocks are presented below the corresponding walking trajectories and the positions of the stepped sensing blocks are marked above each curve. Source data are provided as a Source data file.