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An Evaluation Approach for a Physically-Based Sticky Lip Model

The Department of Computer Science, University of Sheffield, Regent Court, 211 Portobello, Sheffield S1 4DP, UK
Author to whom correspondence should be addressed.
This paper is an extended version of conference paper “Leach, M.; Maddock, S. Physically-based Sticky Lips. In Proceedings of the EG UK Computer Graphics and Visual Computing, EGUK, Swansea, Wales, 13–14 September 2018”.
These authors contributed equally to this work.
Computers 2019, 8(1), 24;
Received: 18 January 2019 / Revised: 28 February 2019 / Accepted: 5 March 2019 / Published: 8 March 2019
PDF [16961 KB, uploaded 8 March 2019]


Physically-based mouth models operate on the principle that a better mouth animation will be produced by simulating physically accurate behaviour of the mouth. In the development of these models, it is useful to have an evaluation approach which can be used to judge the effectiveness of a model and draw comparisons against other models and real-life mouth behaviour. This article presents a set of metrics which can be used to describe the motion of the lips, as well as a process for measuring these from video of real or simulated mouths, implemented using Python and OpenCV. As an example, the process is used to evaluate a physically-based mouth model focusing on recreating the stickiness effect of saliva between the lips. The metrics highlight the changes in behaviour due to the addition of stickiness between the lips in the synthetic mouth model and show quantitatively improved behaviour in relation to real mouth movements. The article concludes that the presented metrics provide a useful approach for evaluation of mouth animation models that incorporate sticky lip effects. View Full-Text
Keywords: evaluation; facial animation; physically-based; sticky lips evaluation; facial animation; physically-based; sticky lips

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Leach, M.; Maddock, S. An Evaluation Approach for a Physically-Based Sticky Lip Model . Computers 2019, 8, 24.

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