Gibbs random field model based 3-D motion estimation from video sequences

Date

1994

Authors

Alatan, A. A.
Levent, O.

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Source Title

Proceedings of SPIE - The International Society for Optical Engineering

Print ISSN

0277-786X

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IEEE

Volume

2308

Issue

Pages

626 - 637

Language

English

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Abstract

In contrast to previous global 3D motion concept, a Gibbs random field based method, which models local interactions between motion parameters defined at each point on the object, is proposed. An energy function which gives the joint probability distribution of motion vectors, is constructed. The energy function is minimized in order to find the most likely motion vector set. Some convergence problems, due to ill-posedness of the problem, are overcome by using the concept of hierarchical rigidity. In hierarchical rigidity, the objects are assumed to be almost rigid in the coarsest level and this rigidness is weakened at each level until the finest level is reached. The propagation of motion information between levels, is encouraged. At the finest level, each point have a motion vector associated with it and the interaction between these vectors are described by the energy function. The minimization of the energy function is achieved by using hierarchical rigidity, without trapping into a local minimum. The results are promising.

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