Dr. Andrew J. Armstrong Profile

Dr. Andrew J. Armstrong

at Loughborough Univ

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Proceedings Article | 2 February 2006 Paper

Concealment driven bit rate reduction using the H.264 video coding standard

Steven T. Beesley, Andrew Armstrong, Christos Grecos, David Parish

Proceedings Volume 6074, 607403 (2006) https://doi.org/10.1117/12.643086

KEYWORDS: Video, Computer programming, Video coding, Quantization, Semantic video, Error analysis, Standards development, Visualization, Multimedia, Networks

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With the continual increase in both popularity and power of portable multimedia devices, it is often desirable to stream video across telephone networks using modern encoding standards, even when the transmission network has only limited bandwidth available. This paper demonstrates an alternative use of the passive error concealment algorithm that is currently used in the H.264 video coding standard. As each macroblock is encoded a concealed version is also generated in the same way that a decoder would conceal an erroneous macroblock. Occasionally the concealed version is mathematically closer to the original source than the normally reconstructed version, in these cases the macroblock is flagged as containing no data and is not included in the bit stream. The decoder then uses the already present weighted pixel value averaging concealment technique to reconstruct the flagged macroblocks as it renders the picture. The proposed method has been tested over a wide variety of test sequences at various sizes and qualities; the outcome of the research is that for almost identical mathematical and visual metric results, a significant reduction in the bit stream size can be achieved, in some cases by as much as 5%.

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