3-D motion estimation and wireframe adaptation including photometric effects for model-based coding of facial image sequences

Date

1994-06

Authors

Bozdağı, G.
Tekalp, A. M.
Onural, L.

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Source Title

IEEE Transactions On Circuits And Systems For Video Technology

Print ISSN

1051-8215

Electronic ISSN

1558-2205

Publisher

IEEE

Volume

4

Issue

3

Pages

246 - 256

Language

English

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Abstract

We propose a novel formulation where 3-D global and local motion estimation and the adaptation of a generic wireframe model to a particular speaker are considered simultaneously within an optical flow based framework including the photometric effects of the motion. We use a flexible wireframe 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 wireframe model. Results with both simulated and real facial image sequences are provided.

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