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    Expressive MPEG-4 Facial Animation Using Quadratic Deformation Models

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    Author
    Obaid, M.
    Mukundan, R.
    Billinghurst, M.
    Pelachaud, C.
    Date
    2010
    Permanent Link
    http://hdl.handle.net/10092/6270

    In this paper we propose an approach compliant with the MPEG-4 standard to synthesize and control facial expressions generated using 3D facial models. This is achieved by establishing the MPEG-4 facial animation standard conformity with the quadratic deformation model representations of facial expressions. This conformity allows us to utilize the MPEG-4 facial animation parameters (FAPs) with the quadratic deformation tables, as a higher layer, to compute the FAP values. The FAP values for an expression E are computed by performing a linear mapping between a set of transformed MPEG-4 FAP points (using quadratic deformation models) and the 3D facial model semantics. The nature of the quadratic deformation model representations of facial expressions can be employed to synthesize and control the six main expressions (smile, sad, fear, surprise, anger, and disgust). Using Whissel’s psychological studies on emotions we compute an interpolation parameter that is used to synthesize intermediate facial expressions. The paper presents results of experimental studies performed using the Greta embodied conversational agent. The achieved results are promising and can lead to future research in synthesizing a wider range of facial expressions.

    Subjects
    MPEG-4 facial animation
     
    quadratic deformation models
     
    facial animation
     
    facial expression synthesis
     
    Field of Research::08 - Information and Computing Sciences::0801 - Artificial Intelligence and Image Processing::080106 - Image Processing
     
    Field of Research::19 - Studies in the Creative Arts and Writing::1902 - Film, Television and Digital Media::190202 - Computer Gaming and Animation
     
    Field of Research::01 - Mathematical Sciences::0101 - Pure Mathematics::010102 - Algebraic and Differential Geometry
    Collections
    • Engineering: Conference Contributions [1920]
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    https://canterbury.libguides.com/rights/ir

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