Abstract
In MPEG-4, two sets of parameters are defined: Facial Definition Parameters (FDPs) and Facial Animation Parameters (FAPs). The FDPs are used to customize the proprietary face model of the decoder to a particular face or to download a face model along with the information about how to animate it. And the FAPs are based on the study of minimal facial actions and are closely related to muscle actions, they represent a complete set of basic facial actions, and therefore allow the representation of most facial expressions. In this paper, we propose a simple key-point displacement-controlling muscle model, which describes how the adjacent facial tissue moves with the key points to reconstruct facial animation using FAPs.
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