A new method for automatic tracking of facial landmarks in 3D motion captured images (4D)

Al-Anezi, T., Khambay, B., Peng, M.J., O’Leary, E., Ju, X. and Ayoub, A. (2013) A new method for automatic tracking of facial landmarks in 3D motion captured images (4D). International Journal of Oral and Maxillofacial Surgery, 42(1), pp. 9-18. (doi: 10.1016/j.ijom.2012.10.035)

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Abstract

The aim of this study was to validate the automatic tracking of facial landmarks in 3D image sequences. 32 subjects (16 males and 16 females) aged 18–35 years were recruited. 23 anthropometric landmarks were marked on the face of each subject with non-permanent ink using a 0.5 mm pen. The subjects were asked to perform three facial animations (maximal smile, lip purse and cheek puff) from rest position. Each animation was captured by the 3D imaging system. A single operator manually digitised the landmarks on the 3D facial models and their locations were compared with those of the automatically tracked ones. To investigate the accuracy of manual digitisation, the operator re-digitised the same set of 3D images of 10 subjects (5 male and 5 female) at 1 month interval. The discrepancies in x, y and z coordinates between the 3D position of the manual digitised landmarks and that of the automatic tracked facial landmarks were within 0.17 mm. The mean distance between the manually digitised and the automatically tracked landmarks using the tracking software was within 0.55 mm. The automatic tracking of facial landmarks demonstrated satisfactory accuracy which would facilitate the analysis of the dynamic motion during facial animations.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ayoub, Professor Ashraf and Ju, Dr Xiangyang and Khambay, Dr Balvinder
Authors: Al-Anezi, T., Khambay, B., Peng, M.J., O’Leary, E., Ju, X., and Ayoub, A.
College/School:College of Medical Veterinary and Life Sciences > School of Medicine, Dentistry & Nursing
College of Medical Veterinary and Life Sciences > School of Medicine, Dentistry & Nursing > Dental School
Journal Name:International Journal of Oral and Maxillofacial Surgery
ISSN:0901-5027
ISSN (Online):1399-0020
Published Online:04 December 2012

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