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CLC number: TN919.8
On-line Access: 2024-08-27
Received: 2023-10-17
Revision Accepted: 2024-05-08
Crosschecked: 0000-00-00
Cited: 3
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Fast mode decision algorithm for spatial resolutions down-scaling transcoding to H.264
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Bu Jia-Jun, Mo Lin-Jian, Chen Chun, Yang Zhi. Fast mode decision algorithm for spatial resolutions down-scaling transcoding to H.264[J]. Journal of Zhejiang University Science A, 2006, 7(100): 70-75.
@article{title="Fast mode decision algorithm for spatial resolutions down-scaling transcoding to H.264",
author="Bu Jia-Jun, Mo Lin-Jian, Chen Chun, Yang Zhi",
journal="Journal of Zhejiang University Science A",
volume="7",
number="100",
pages="70-75",
year="2006",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2006.AS0070"
}
%0 Journal Article
%T Fast mode decision algorithm for spatial resolutions down-scaling transcoding to H.264
%A Bu Jia-Jun
%A Mo Lin-Jian
%A Chen Chun
%A Yang Zhi
%J Journal of Zhejiang University SCIENCE A
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%P 70-75
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2006.AS0070
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T1 - Fast mode decision algorithm for spatial resolutions down-scaling transcoding to H.264
A1 - Bu Jia-Jun
A1 - Mo Lin-Jian
A1 - Chen Chun
A1 - Yang Zhi
J0 - Journal of Zhejiang University Science A
VL - 7
IS - 100
SP - 70
EP - 75
%@ 1673-565X
Y1 - 2006
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2006.AS0070
Abstract: A fast mode decision algorithm is proposed in this paper to accelerate the process of transcoding videos into h.264 with arbitrary rate spatial resolution down-scaling. The proposed algorithm consists of three steps. First, an early-stop technique is introduced to determine the 16×16-mode blocks, which take up about 70% of all the macroblocks; then, a bottom-up merging process is performed to determine the mode of rest non-early-stopped blocks; and then, we adopt half-pixel motion estimation to further refine the acquired predictive motion vectors. In order to obtain the predictive motion vectors for early-stop and merging processes, we propose a motion vector composition scheme, which can reuse the information in the input pre-encoded videos to handle the spatial resolution down-scaling. Experimental results showed that our algorithm is about four times faster than the Cascaded-Decoder-Encoder method and has negligible PSNR drop and little bit rate increase.
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