Asymmetric facial expressions : revealing richer emotions for embodied conversational agents

Ahn, Junghyun (Immersive Interaction Group, EPFL, Lausanne, Switzerland) ; Gobron, Stéphane (Immersive Interaction Group, EPFL, Lausanne, Switzerland ; School of Engineering – HE-Arc Ingénierie, HES-SO // University of Applied Sciences Western Switzerland) ; Thalmann, Daniel (Institute for Media Innovation, NTU, Singapore) ; Boulic, Ronan (Immersive Interaction Group, EPFL, Lausanne, Switzerland)

In this paper, we propose a method to achieve effective facial emotional expressivity for embodied conversational agents by considering two types of asymmetry when exploiting the valence-arousal-dominance representation of emotions. Indeed, the asymmetry of facial expressions helps to convey complex emotional feelings such as conflicting and/or hidden emotions due to social conventions. To achieve such a higher degree of facial expression in a generic way, we propose a new model for mapping the valence-arousal-dominance emotion model onto a set 12 scalar facial part actions built mostly by combining pairs of antagonist action units from the Facial Action Coding System. The proposed linear model can automatically drive a large number of autonomous virtual humans or support the interactive design of complex facial expressions over time. By design, our approach produces symmetric facial expressions, as expected for most of the emotional spectrum. However, more complex ambivalent feelings can be produced when differing emotions are applied on the left and right sides of the face. We conducted and experiment on static images produced by our approach to compare the expressive power of symmetric and asymmetric facial expressions for a set of eight basic and complex emotions. Results confirm both the pertinence of our general mapping for expressing basic emotions and the significant improvement brought by asymmetry for expressing ambivalent feelings.


Keywords:
Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HE-Arc Ingénierie
Institute:
Aucun institut
Subject(s):
Ingénierie
Date:
2013-07
Pagination:
13 p.
Published in:
Computer Animation and Virtual Worlds
Numeration (vol. no.):
2013, vol. 24, no. 6, pp. 539-551
DOI:
ISSN:
1546-4261
Appears in Collection:

Note: The status of this file is: restricted


 Record created 2019-05-21, last modified 2019-06-17

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