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Scalable Description of Shape and Motion
for Object-based Video Coding
G.R. Martin & M.K. Steliaros & R.A. Packwood.
Proceedings of IEE 7th Int. Conference on Image Processing and its Applications (IPA'99),
Manchester, UK, July 1999, pp 157-161.
Abstract:
Recently developed video coding schemes such as MPEG-4 permit
arbitrarily-shaped objects to be encoded as separate entities. We describe a
shape coding algorithm that adapts the MPEG-4 arbitrary shape coding strategies
to a variable block size framework. The new technique, when used in conjunction
with motion compensation schemes employing quad-trees as a coding mechanism,
successfully integrates the shape and quad-tree coding in a unified structure
that minimises temporal correlation. Performance evaluation using MPEG-4 test
sequences shows a reduction of up to 16\% in the combined motion and shape
coding cost.
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