Three-dimensional motion analysis - an exploratory study. Part 2: Reproducibility of facial movement

Popat, Hashmat, Richmond, Stephen ORCID: https://orcid.org/0000-0001-5449-5318, Playle, Rebecca Anne ORCID: https://orcid.org/0000-0002-2989-1092, Marshall, Andrew David ORCID: https://orcid.org/0000-0003-2789-1395, Rosin, Paul L. ORCID: https://orcid.org/0000-0002-4965-3884 and Cosker, D 2008. Three-dimensional motion analysis - an exploratory study. Part 2: Reproducibility of facial movement. Orthodontics and Craniofacial Research 11 (4) , pp. 224-228. 10.1111/j.1601-6343.2008.00435.x

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Abstract

Authors – Popat H, Richmond S, Playle R, Marshall D, Rosin PL, Cosker D Objectives – To investigate the reproducibility of using spoken word as a measure of facial movement. Design – Experimental study. Setting and Sample Population – Department of Dental Health and Biological Sciences, University Dental Hospital, Cardiff. 22 normal subjects. Experimental Variable – Subjects were asked to say the word ‘puppy’ in a normal, relaxed manner twice within a 10-second time interval. The sequence was recorded using a non-invasive, three-dimensional motion analysis image capture system (3DMDface™ Dynamic System) at 48 frames per second. Outcome Variable – Corresponding frames between the two utterances were aligned three-dimensionally using best fit on non-moveable points on the upper half of the face. Reproducibility was measured as the percentage point deviation between ± 0.5 mm between two corresponding frames. Results – Mean intrasessional reproducibility (SD) for the group was recorded at 86.2% (5.8). The reproducibility ranged from a minimum of 66.8% to a maximum of 97.5%. When the utterance was split into its two separate viseme segments (/p//u//p/ and /p//y/), the second part of the utterance was seen to be more reproducible than the first. The male group were more reproducible than the female group. Conclusion – Intrasessional reproducibility of the utterance ‘puppy’ shows high intra- and intersubject variability in this group of normal subjects and therefore further research needs to be conducted before being able to confidently use this word as a reproducible measure of facial movement.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Dentistry Computer Science & Informatics
Subjects:	Q Science > QA Mathematics > QA76 Computer software R Medicine > RK Dentistry T Technology > T Technology (General)
Uncontrolled Keywords:	facial expression ; facial movement ; imaging;motion analysis ; reproducibility ; speech ; three-dimensional
Publisher:	Wiley-Blackwell
ISSN:	1601-6335
Last Modified:	03 Dec 2022 11:43
URI:	https://orca.cardiff.ac.uk/id/eprint/14170

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