3rd International ICST workshop on mobile media delivery

Research Article

Transformation techniques for future video coding

        author={Kenneth  Vermeirsch and Stijn  Notebaert and Jan  De Cock and Peter  Lambert and Rik Van de Walle},
        title={Transformation techniques for future video coding},
        proceedings={3rd International ICST workshop on mobile media delivery},
        keywords={Video coding transform DCT partitioning coding efficiency},
  • Kenneth Vermeirsch
    Stijn Notebaert
    Jan De Cock
    Peter Lambert
    Rik Van de Walle
    Year: 2010
    Transformation techniques for future video coding
    DOI: 10.4108/ICST.MOBIMEDIA2009.7990
Kenneth Vermeirsch1,*, Stijn Notebaert1,*, Jan De Cock1,*, Peter Lambert1,*, Rik Van de Walle1,*
  • 1: Ghent University – IBBT, Department of Electronics and Information Systems – Multimedia Lab, Gaston Crommenlaan 8 bus 201, 9050 Ghent-Ledeberg, Belgium.
*Contact email: kenneth.vermeirsch@ugent.be, stijn.notebaert@ugent.be, jan.decock@ugent.be, peter.lambert@ugent.be, rik.vandewalle@ugent.be


In this paper we present a number of advanced concepts with respect to the transformation of residual blocks in video coders, which go beyond what is incorporated in today's video coding standards. Some of these concepts will undoubtedly be adopted as part of future standards. We discuss directional transforms for extrapolation-based prediction schemes, shape-adaptive transformation for object-based coding, and large transform sizes. For the latter we provide in-depth coding efficiency results which clearly illustrate the potential benefit, especially for high definition source material, which will dominate the requirements of tomorrow's video coding standards. The compression efficiency gains that can be achieved with large block transforms range from 6 to 25%. Finally we also comment on the paradigm of coupling partition and transform areas, a principle which can be applied to block transforms as well as to shape-adaptive transforms for object-based coding.