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      Automatic motion tracking of lips using digital video and OpenFace 2.0

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          Abstract

          Because the lips are external organs, they can be easily observed by means that are non-invasive, including simple video recording. The current paper introduces a free-of-charge, highly portable, automatic solution for extracting oral posture from digital video, based on an existing face-tracking utility. We describe how this solution might benefit various lines of laboratory phonology research, including analysis of articulatory coordination and audiovisual speech, as well as phonetic fieldwork. We then provide a tutorial, framed as a simple experiment in metronomic speech. The tutorial describes how to configure the software to work with one’s digital camera of choice, how to extract relevant articulatory parameters from the face tracker, and how to approach statistical analysis. We have supplied pre-written Python scripts to aid the reader in following along with the experiment. The portability, ease, and affordability of the described solution have important implications for the accessibility of articulatory measurement, both in the lab and out in the field.

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          Most cited references 17

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          The use of ultrasound for linguistic phonetic fieldwork

           Bryan Gick (2002)
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            Precision, repeatability and accuracy of Optotrak® optical motion tracking systems

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              Jaw height and consonant place

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                Author and article information

                Contributors
                Journal
                1868-6354
                Laboratory Phonology: Journal of the Association for Laboratory Phonology
                Ubiquity Press
                1868-6354
                07 July 2020
                2020
                : 11
                : 1
                Affiliations
                [1 ]Department of Psychology, University of California Santa Cruz, Santa Cruz, CA, US
                [2 ]Department of Psychology, California State University Channel Islands, Camarillo, CA, US
                Article
                10.5334/labphon.232
                Copyright: © 2020 The Author(s)

                This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See http://creativecommons.org/licenses/by/4.0/.

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