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Proceedings Paper

A neighborhood analysis based technique for real-time error concealment in H.264 intra pictures
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Paper Abstract

H.264s extensive use of context-based adaptive binary arithmetic or variable length coding makes streams highly susceptible to channel errors, a common occurrence over networks such as those used by mobile devices. Even a single bit error will cause a decoder to discard all stream data up to the next fixed length resynchronisation point, the worst scenario is that an entire slice is lost. In cases where retransmission and forward error concealment are not possible, a decoder should conceal any erroneous data in order to minimise the impact on the viewer. Stream errors can often be spotted early in the decode cycle of a macroblock which if aborted can provide unused processor cycles, these can instead be used to conceal errors at minimal cost, even as part of a real time system. This paper demonstrates a technique that utilises Sobel convolution kernels to quickly analyse the neighbourhood surrounding erroneous macroblocks before performing a weighted multi-directional interpolation. This generates significantly improved statistical (PSNR) and visual (IEEE structural similarity) results when compared to the commonly used weighted pixel value averaging. Furthermore it is also computationally scalable, both during analysis and concealment, achieving maximum performance from the spare processing power available.

Paper Details

Date Published: 26 February 2007
PDF: 8 pages
Proc. SPIE 6507, Multimedia on Mobile Devices 2007, 650706 (26 February 2007); doi: 10.1117/12.704866
Show Author Affiliations
Steven T. C. Beesley, Loughborough Univ. (United Kingdom)
Christos Grecos, Loughborough Univ. (United Kingdom)
Eran Edirisinghe, Loughborough Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 6507:
Multimedia on Mobile Devices 2007
Reiner Creutzburg; Jarmo H. Takala; Jianfei Cai, Editor(s)

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