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BBC R&D White Paper WHP083

Bi-directional affine motion compensation using a content-based, non-connected, triangular mesh
Marc Servais*, Theo Vlachos* and Thomas Davies†

*University of Surrey, UK; and †BBC Research and Development, UK

Keywords
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Abstract
A new mesh-generation scheme for motion compensation is presented and discussed. To start with, spatio-temporal segmentation is applied to an image (and a reference frame) in order to identify the boundaries of moving regions, which are then approximated with polygons. A triangular mesh is generated within each polygon, thus ensuring that no triangle straddles multiple regions. The affine motion parameters are then estimated separately for each triangle, using bi-directional motion estimation. Results for various test sequences demonstrate the advantages offered by the use of a contentbased mesh, and by affine motion compensation.

This paper was given at the 1st European Conference on Visual Media Production (CVMP) 15-16 March 2004 at The IEE, Savoy Place, London.