Speeding up Dirac's entropy coder

Authors:
Hendrik Eeckhaut;Benjamin Schrauwen;Mark Christiaens;Jan Van Campenhout
Affiliations:
Parallel Information Systems, Electronics and Information Systems, Ghent University, Gent, Belgium;Parallel Information Systems, Electronics and Information Systems, Ghent University, Gent, Belgium;Parallel Information Systems, Electronics and Information Systems, Ghent University, Gent, Belgium;Parallel Information Systems, Electronics and Information Systems, Ghent University, Gent, Belgium
Venue:
MIV'05 Proceedings of the 5th WSEAS international conference on Multimedia, internet & video technologies
Year:
2005

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Abstract

The Dirac codec is a new prototype video coding algorithm from BBC R&D based on wavelet technology. Compression-wise the algorithm is broadly competitive with the state-of-the-art video codecs but computational-wise the execution time is currently poor. One of the large bottlenecks is the arithmetic coder. Hence we took this part under investigation and replaced it with a faster variant, the M-coder, that is also used in the H.264/AVC codec. The resulting coder is substantially faster. We reached a convincing speedup. Thanks to an intelligent tuning of initialisation and adaption parameters the impact of the compression performance is very limited.