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Joint MPEG-2/H.264 scalable coding and enhancements to H.264 intra-mode prediction

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Title: Joint MPEG-2/H.264 scalable coding and enhancements to H.264 intra-mode prediction
Author: Storey, Duane Thomas
Degree Master of Applied Science - MASc
Program Electrical and Computer Engineering
Copyright Date: 2006
Abstract: In this thesis, several enhancements and optimizations related to H. 264, the latest and most advanced video standard, are explored. The first part of this work involves the investigation of a new spatial scalability scheme involving MPEG-2 as a base-layer and H.264 as a spatial enhancement-layer. This scheme does not involve any bitstream modifications, and can be configured using off-the-shelf components. While simplistic, this scheme results in bitrate reductions for the tested CIF sequences of approximately 50% (depending on the quality of the base-layer) and bitrate reductions on the order of 20% for high-definition 720p imagery. An alternate scheme is also proposed that extends the H.264 bitstream syntax by adding a new 4x4 Intra-block prediction mode. For Intra-frames, bitrate reductions on the order of 25% are possible depending on the quality of the base-layer. Since this scheme can also choose to ignore distorted base-layer blocks, it is not subject to the large bit-penalty associated with low-bitrate base-layer sequences demonstrated using the first proposed scheme. Finally, a modified Intra-mode prediction scheme is proposed for H.264 that involves forming a real-time estimate of the joint probability distribution functions for the Intra prediction modes. Using these distributions, it is possible to obtain an increase in prediction accuracy of approximately 50% over the default H.264 prediction method.
URI: http://hdl.handle.net/2429/18364
Series/Report no. UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]

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