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An efficient complexity-scalable video transcoder with mode refinement
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DOI：10.1016/j.image.2007.02.002.png)
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Abstract
En 中文
MPEG-4 AVC (H.264) has been recently approved and is rapidly being adopted for applications including HD-DVD and satellite broadcast. To facilitate inter connectivity between different applications using MPEG-4 AVC, transcoding will be a key factor. When requantizing a bitstream, the incoming coding decisions are usually kept unchanged in order to reduce complexity. However, this can have a major impact on the coding efficiency. This paper proposes a novel mode refinement algorithm for inter prediction when requantizing MPEG-4 AVC bitstreams. The proposed approach produces a quality comparable to a full search with only 10% of its complexity, by exploiting the statistical properties of the mode distribution to enable restricted motion vector refinement. Moreover, it enables a trade off between complexity and quality by adapting the algorithm to the computational resources available. (C) 2007 Elsevier B.V. All rights reserved.
Keywords:
transcoding
requantization
bitrate reduction
mode refinement
MPEG-4 AVC
H.264
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