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. 2022 Mar 17;13:1401. doi: 10.1038/s41467-022-29083-0

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© The Author(s) 2022

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. 5 — a Schematic diagram of unlocking a gate by lip motion with personal identity verification. b A comparison of lip-motion signals from participants (Han and Bin) in the time domain. c Short-time Fourier transform (STFT) analysis of the lip-motion signals from Han. d Schematic diagram of direction control for toy car motion by lip motion. e Comparison of lip-motion signals from Han in the time domain. f STFT analysis of the lip-motion signals for ‘Go forwards’ from Han. g Schematic diagram of the daily voice communication for people lacking a voice with and without lip-language decoding system (LLDS).