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      • Department of Electrical and Electronics Engineering
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      Simultaneous 3-D motion estimation and wire-frame model adaptation including photometric effects for knowledge-based video coding

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      Author
      Bozdağı, Gözde
      Tekalp, A. M.
      Onural, Levent
      Date
      1994
      Source Title
      Proceedings of the 19th International Conference on Acoustics, Speech and Signal Processing, IEEE 1994
      Print ISSN
      1520-6149
      Publisher
      IEEE
      Pages
      V413 - V416
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      We address the problem of 3-D motion estimation in the context of knowledge-based coding of facial image sequences. The proposed method handles the global and local motion estimation and the adaptation of a generic wire-frame to a particular speaker simultaneously within an optical flow based framework including the photometric effects of motion. We use a flexible wire-frame model whose local structure is characterized by the normal vectors of the patches which are related to the coordinates of the nodes. Geometrical constraints that describe the propagation of the movement of the nodes are introduced, which are then efficiently utilized to reduce the number of independent structure parameters. A stochastic relaxation algorithm has been used to determine optimum global motion estimates and the parameters describing the structure of the wire-frame model. For the initialization of the motion and structure parameters, a modified feature based algorithm is used. Experimental results with simulated facial image sequences are given.
      Keywords
      Facial image sequence
      Feature-based algorithm
      Geometrical constraints
      Local motion estimations
      Model Adaptation
      Motion and structure
      Stochastic relaxation
      Structure parameter
      Algorithms
      Computer vision
      Image coding
      Knowledge based systems
      Photometry
      Stochastic models
      Wire
      Motion estimation
      Permalink
      http://hdl.handle.net/11693/27778
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/ICASSP.1994.389400
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      • Department of Electrical and Electronics Engineering 3524
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