A geometric morphometric approach to the analysis of lip shape during speech: development of a clinical outcome measure

Popat, Hashmat, Richmond, Stephen ORCID: https://orcid.org/0000-0001-5449-5318, Zhurov, Alexei ORCID: https://orcid.org/0000-0002-5594-0740, Rosin, Paul L. ORCID: https://orcid.org/0000-0002-4965-3884 and Marshall, Andrew David ORCID: https://orcid.org/0000-0003-2789-1395 2013. A geometric morphometric approach to the analysis of lip shape during speech: development of a clinical outcome measure. PLoS ONE 8 (2) , e57368. 10.1371/journal.pone.0057368

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Abstract

Objective assessments of lip movement can be beneficial in many disciplines including visual speech recognition, for surgical outcome assessment in patients with cleft lip and for the rehabilitation of patients with facial nerve impairments. The aim of this study was to develop an outcome measure for lip shape during speech using statistical shape analysis techniques. Lip movements during speech were captured from a sample of adult subjects considered as average using a three-dimensional motion capture system. Geometric Morphometrics was employed to extract three-dimensional coordinate data for lip shape during four spoken words decomposed into seven visemes (which included the resting lip shape). Canonical variate analysis was carried out in an attempt to statistically discriminate the seven visemes. The results showed that the second canonical variate discriminated the resting lip shape from articulation of the utterances and accounted for 17.2% of the total variance of the model. The first canonical variate was significant in discriminating between the utterances and accounted for 72.8% of the total variance of the model. The outcome measure was created using the 95% confidence intervals of the canonical variate scores for each subject plotted as ellipses for each viseme. The method and outcome model is proposed as reference to compare lip movement during speech in similar population groups.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Computer Science & Informatics Dentistry
Subjects:	Q Science > QA Mathematics > QA75 Electronic computers. Computer science R Medicine > R Medicine (General)
Publisher:	Public Library of Science
ISSN:	1932-6203
Date of First Compliant Deposit:	30 March 2016
Last Modified:	17 May 2023 23:01
URI:	https://orca.cardiff.ac.uk/id/eprint/60466

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