MPEG-4 facial expression synthesis |
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Authors: | L Malatesta A Raouzaiou K Karpouzis S Kollias |
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Affiliation: | (1) Image, Video and Multimedia Systems Laboratory, National Technical University of Athens, 9, Heroon Politechniou str., Zografou, 15780, Greece |
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Abstract: | The current work will describe an approach to synthesize expressions, including intermediate ones, via the tools provided
in the MPEG-4 standard based on real measurements and on universally accepted assumptions of their meaning, taking into account
results of Whissel’s study. Additionally, MPEG-4 facial animation parameters are used in order to evaluate theoretical predictions
for intermediate expressions of a given emotion episode, based on Scherer’s appraisal theory. MPEG-4 FAPs and action units
are combined in modeling the effects of appraisal checks on facial expressions and temporal evolution issues of facial expressions
are investigated. The results of the synthesizing process can then be applied to Embodied Conversational Agents (ECAs), rendering
their interaction with humans, or other ECAs, more affective. |
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