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Proceedings Paper

Lossy techniques for motion vector encoding
Author(s): Mihai Sipitca; Vijay K. Madisetti
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Paper Abstract

In this paper we investigate the advantages of using lossy encoding of the motion vectors (MV). This is done in the context of accommodating a larger amount of MV information that results if one uses a smaller size of the macroblock (MB). After estimating the improvement in the displaced frame difference (DFD) variance associated with the decrease of the size of the MB to 8 for salesman QCIF sequence, we look at the lossy DCT performance in the context of rate-distortion trade off. A theoretical argument in favor of the Walsh Hadamard transform is made and the experimental results back up the assumption that it performs better than the DCT. The influence of the size of the kernel is also investigated. A combination of the WHT with lossy techniques imbedded in the MV estimation process that improve the MV field redundancy is proved to perform best for the lossy transform case. Then, we look at VQ encoding of the MVs and the results are compared with the transform case in terms of rate- distortion performance and flexibility.

Paper Details

Date Published: 27 February 1996
PDF: 7 pages
Proc. SPIE 2727, Visual Communications and Image Processing '96, (27 February 1996); doi: 10.1117/12.233253
Show Author Affiliations
Mihai Sipitca, Georgia Institute of Technology (United States)
Vijay K. Madisetti, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 2727:
Visual Communications and Image Processing '96
Rashid Ansari; Mark J. T. Smith, Editor(s)

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