An Algebra for combining MPEG-4 compliant Facial Animations
نویسنده
چکیده
$%675$&7 In this paper we discuss an extension of the Algebra of Expressions, an algebraic structure introduced in an earlier paper, consisting of a set of operators and related properties defined over a set that is a generalization of the MPEG-4’s Facial Animation Parameters. In particular, we extend the definition of the operators acting on whole animations, i.e. sequences of frames representing facial dynamics, instead of still facial displays. A set of examples of algebraic expressions combining animations of a facial model is then presented, showing that the algebra of expressions may be used: a) to describe, manipulate, and generate in a compact way facial dynamics; b) as a tool to further study and better understand the role of emotions conveyed by facial expressions and their relationships; c) as a basis to define an animation algorithm for MPEG-4 compliant facial models.
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