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Compact Representation of Motion
Parameters for Object-based Video Coding
R.A. Packwood
& M.K. Steliaros & G.R. Martin.
EUSIPCO Proceedings of Signal Processing IX Theories and Applications,
Vol. 4, September 1998, pp 2081-2084.
Abstract:
We describe motion coding algorithms for use with the
arbitrary shaped objects of emerging video coding standards. These algorithms
exploit the temporal redundancy of the object shape description under
conditions of concentrated diverse motion. In Variable Sized Block Matching
(VSBM), the ambiguity of small area matching is reduced by coalescing blocks to
yield accurate motion information over larger blocks. The technique is extended
to exploit irregularly shaped areas of uniform motion within a small object.
This Modified VSBM (MVSBM) can be enhanced by coding areas of identical motion
within the spatial structure of the object. This spatial structure itself has
temporal redundancy that can be reduced by inter-frame differential coding.
For the MPEG-4 test sequences "Stefan" and "Children" the total amount of data
required to specify motion shows improvements of 20% and 17% respectively.
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