Dyadic spatial resolution reduction transcoding for H.264/AVC |
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Authors: | Jan De Cock Stijn Notebaert Kenneth Vermeirsch Peter Lambert Rik Van de Walle |
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Affiliation: | (1) Multimedia Lab, Department of Electronics and Information Systems, Ghent University - IBBT, Gaston Crommenlaan 8 b 201, 9050 Ledeberg-Ghent, Belgium |
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Abstract: | In this paper, we examine spatial resolution downscaling transcoding for H.264/AVC video coding. A number of advanced coding
tools limit the applicability of techniques, which were developed for previous video coding standards. We present a spatial
resolution reduction transcoding architecture for H.264/AVC, which extends open-loop transcoding with a low-complexity compensation
technique in the reduced-resolution domain. The proposed architecture tackles the problems in H.264/AVC and avoids visual
artifacts in the transcoded sequence, while keeping complexity significantly lower than more traditional cascaded decoder–encoder
architectures. The refinement step of the proposed architecture can be used to further improve rate-distortion performance,
at the cost of additional complexity. In this way, a dynamic-complexity transcoder is rendered possible. We present a thorough
investigation of the problems related to motion and residual data mapping, leading to a transcoding solution resulting in
fully compliant reduced-size H.264/AVC bitstreams. |
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