International organisation for standardisation organisation internationale de normalisation
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- 6.3Wavelet Video Coding
6.2Video Coding Tools RepositorySeveral breakout meetings were held to discuss VCTR matters during the MPEG week. Four input contributions were reviewed as listed below. Progress was made in particular in the integration of AVC technology (baseline profile, intra coding) into the VCTR framework. More time was spent within the group for a more fundamental understanding of VCTR implications and application on media coding development, as well as setting up a work plan for the next phase. A paradigm shift in media coding as observed today can be interpreted as many tools likewise being used in many different codecs rather than the traditional "one tool-one functionality" design. Furthermore, the traditional view of "one standard for each dedicated application" is shifted by the fact that many codecs are housed in a single platform, including competing MPEG and non-MPEG codecs. The traditional codec-level conformance specification is not efficient for such multiple codec support, where many codecs share common/similar tools. Furthermore, MPEG should shorten the cycle of standardization of a new technology (with interoperability) and enable more flexible usage of MPEG codecs in a highly dynamic environment. Therefore, VCTR should not be an alternate specification of existing MPEG standards, but rather enable and simplify MPEG-1/2/4 implementations. This includes the possibility to design new codecs based on VCTR, simplify transcoding, allow for efficient hardware implementation and define conformance testing at the level of Functional Units (FU) instead of full codecs. As a next major step, a demo of VCTR (including software implementation) is planned for the October meeting. This will demonstrate the feasibility of defining a new Codec using VCTR building blocks (including syntax Information and new syntax based bitstream). An example could be integration of AVC intra coding tools into an MPEG-4 Visual (part 2) codec. Furthermore, transform-level transcoding is a possible candidate for demonstration. Technical description (TD) of VCTR as well as the software will be further developed to allow such a demo. A possible timeline for VCTR standardization (as discussed in the breakout group) could be CD for April 2006, FCD for April 2007. Documents reviewed:
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6.3Wavelet Video CodingAt the Hong Kong meeting, it was decided by the Ad hoc group to use only one software framework primarily for further explorations on wavelet video coding developments. This package was provided by Microsoft Research Asia, using the new copyright disclaimer format (N6851). All technical input documents brought to the Busan meeting were already related to implementations within that software framework. Progress was made in particular investigating alternative (generalized) strategies of spatio-temporal wavelet decomposition and reducing artefacts by appropriate post processing. It is planned to integrate newly proposed tools into the software framework, to be used in the next round of exploration experiments (see description in N7098). In particular EE1 is targeted in finding further progress by full integration of different proposed technology. The experimental settings were derived from the SVC Core Experiments as defined by the Palma meeting, however extending the ranges of SNR scalability which might be of particular importance to show an advantage of embedded wavelet concepts as compared to the emerging SVC amendment of AVC. EE2 and EE3 are related to improvements of entropy coding and intra prediction. Details of the technical inputs can be summarized as follows: Documents reviewed:
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