Three-dimensional motion analysis - an exploratory study. Part 1: Assessment 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 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 1: Assessment of facial movement. Orthodontics and Craniofacial Research 11 (4) , pp. 216-223. 10.1111/j.1601-6343.2008.00433.x

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Abstract

Authors – Popat H, Richmond S, Playle R, Marshall D, Rosin PL, Cosker D Objectives – To objectively quantify facial movement in response to facial expression and spoken word. Design – Experimental study. Setting – Department of Dental Health and Biological Sciences, University Dental Hospital, Cardiff, UK. Experimental Variable – Facial movement was assessed in response to a standardized smile expression and the utterance �puppy�. The sequences were recorded using a non-invasive, three-dimensional motion analysis image capture system (3dMDfaceTM Dynamic System) at 48 frames per second. Outcome Variable – To quantify the facial movement, sequential frames of a sequence were aligned to the baseline ⁄ reference frame three-dimensionally using best fit on non-moveable points in the upper half of the face. Accuracy of the alignment process for each sequence was tested using the percentage of stable points (i.e. within ±0.5 mm) within the upper half of the face. Results – Quantifiable changes in facial topology were seen during both the standardized smile expression and the utterance �puppy�. The mean percentage of points (SD) that remained stable within the upper half of the face during the utterance �puppy� was 88.8% (4.7). During the standardized smile expression, there were a much lower percentage of stable points in the upper half of the face with a mean (SD) of 60.9% (3.2). Conclusion – The 3dMDfaceTM Dynamic System allows objective, threedimensional, non-invasive assessment of facial movement. The utterance �puppy� is a more appropriate measure of facial movement when compared with the standardized smile expression.

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 ;motion analysis ; speech ; three-dimensional
Publisher:	Wiley-Blackwell
ISSN:	1601-6335
Last Modified:	03 Dec 2022 11:43
URI:	https://orca.cardiff.ac.uk/id/eprint/14169

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