Low-Complexity Hybrid-Domain H.264/SVC to H.264/AVC Spatial Transcoding with Drift Compensation for Videoconferencing

Lei SUN; Zhenyu LIU; Takeshi IKENAGA

doi:10.1587/transfun.E96.A.2142

Low-Complexity Hybrid-Domain H.264/SVC to H.264/AVC Spatial Transcoding with Drift Compensation for Videoconferencing

Lei SUN, Zhenyu LIU, Takeshi IKENAGA

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As an extension of H.264/AVC, Scalable Video Coding (SVC) provides the ability to adapt to heterogeneous networks and user-end requirements, which offers great scalability in multi-point applications such as videoconferencing. However, transcoding between SVC and AVC becomes necessary due to the existence of legacy AVC-based systems. The straightforward full re-encoding method requires great computational cost, and the fast SVC-to-AVC spatial transcoding techniques have not been thoroughly investigated yet. This paper proposes a low-complexity hybrid-domain SVC-to-AVC spatial transcoder with drift compensation, which provides even better coding efficiency than the full re-encoding method. The macroblocks (MBs) of input SVC bitstream are divided into two types, and each type is suitable for pixel- or transform-domain processing respectively. In the pixel-domain transcoding, a fast re-encoding method is proposed based on mode mapping and motion vector (MV) refinement. In the transform-domain transcoding, the quantized transform coefficients together with other motion data are reused directly to avoid re-quantization loss. The drift problem caused by proposed transcoder is solved by compensation techniques for I frame and P frame respectively. Simulation results show that proposed transcoder achieves averagely 96.4% time reduction compared with the full re-encoding method, and outperforms the reference methods in coding efficiency.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E96-A No.11 pp.2142-2153

Publication Date: 2013/11/01

Publicized

Online ISSN: 1745-1337

DOI: 10.1587/transfun.E96.A.2142

Type of Manuscript: Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)

Category: Image Processing

Authors

Lei SUN
  Waseda University
Zhenyu LIU
  Tsinghua University
Takeshi IKENAGA
  Waseda University

Keyword

SVC-to-AVC transcoding, spatial scalability, hybrid-domain, drift compensation, videoconferencing

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Lei SUN, Zhenyu LIU, Takeshi IKENAGA, "Low-Complexity Hybrid-Domain H.264/SVC to H.264/AVC Spatial Transcoding with Drift Compensation for Videoconferencing" in IEICE TRANSACTIONS on Fundamentals, vol. E96-A, no. 11, pp. 2142-2153, November 2013, doi: 10.1587/transfun.E96.A.2142.
Abstract: As an extension of H.264/AVC, Scalable Video Coding (SVC) provides the ability to adapt to heterogeneous networks and user-end requirements, which offers great scalability in multi-point applications such as videoconferencing. However, transcoding between SVC and AVC becomes necessary due to the existence of legacy AVC-based systems. The straightforward full re-encoding method requires great computational cost, and the fast SVC-to-AVC spatial transcoding techniques have not been thoroughly investigated yet. This paper proposes a low-complexity hybrid-domain SVC-to-AVC spatial transcoder with drift compensation, which provides even better coding efficiency than the full re-encoding method. The macroblocks (MBs) of input SVC bitstream are divided into two types, and each type is suitable for pixel- or transform-domain processing respectively. In the pixel-domain transcoding, a fast re-encoding method is proposed based on mode mapping and motion vector (MV) refinement. In the transform-domain transcoding, the quantized transform coefficients together with other motion data are reused directly to avoid re-quantization loss. The drift problem caused by proposed transcoder is solved by compensation techniques for I frame and P frame respectively. Simulation results show that proposed transcoder achieves averagely 96.4% time reduction compared with the full re-encoding method, and outperforms the reference methods in coding efficiency.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1587/transfun.E96.A.2142/_p

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@ARTICLE{e96-a_11_2142,
author={Lei SUN, Zhenyu LIU, Takeshi IKENAGA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Low-Complexity Hybrid-Domain H.264/SVC to H.264/AVC Spatial Transcoding with Drift Compensation for Videoconferencing},
year={2013},
volume={E96-A},
number={11},
pages={2142-2153},
abstract={As an extension of H.264/AVC, Scalable Video Coding (SVC) provides the ability to adapt to heterogeneous networks and user-end requirements, which offers great scalability in multi-point applications such as videoconferencing. However, transcoding between SVC and AVC becomes necessary due to the existence of legacy AVC-based systems. The straightforward full re-encoding method requires great computational cost, and the fast SVC-to-AVC spatial transcoding techniques have not been thoroughly investigated yet. This paper proposes a low-complexity hybrid-domain SVC-to-AVC spatial transcoder with drift compensation, which provides even better coding efficiency than the full re-encoding method. The macroblocks (MBs) of input SVC bitstream are divided into two types, and each type is suitable for pixel- or transform-domain processing respectively. In the pixel-domain transcoding, a fast re-encoding method is proposed based on mode mapping and motion vector (MV) refinement. In the transform-domain transcoding, the quantized transform coefficients together with other motion data are reused directly to avoid re-quantization loss. The drift problem caused by proposed transcoder is solved by compensation techniques for I frame and P frame respectively. Simulation results show that proposed transcoder achieves averagely 96.4% time reduction compared with the full re-encoding method, and outperforms the reference methods in coding efficiency.},
keywords={},
doi={10.1587/transfun.E96.A.2142},
ISSN={1745-1337},
month={November},}

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TY - JOUR
TI - Low-Complexity Hybrid-Domain H.264/SVC to H.264/AVC Spatial Transcoding with Drift Compensation for Videoconferencing
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 2142
EP - 2153
AU - Lei SUN
AU - Zhenyu LIU
AU - Takeshi IKENAGA
PY - 2013
DO - 10.1587/transfun.E96.A.2142
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E96-A
IS - 11
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - November 2013
AB - As an extension of H.264/AVC, Scalable Video Coding (SVC) provides the ability to adapt to heterogeneous networks and user-end requirements, which offers great scalability in multi-point applications such as videoconferencing. However, transcoding between SVC and AVC becomes necessary due to the existence of legacy AVC-based systems. The straightforward full re-encoding method requires great computational cost, and the fast SVC-to-AVC spatial transcoding techniques have not been thoroughly investigated yet. This paper proposes a low-complexity hybrid-domain SVC-to-AVC spatial transcoder with drift compensation, which provides even better coding efficiency than the full re-encoding method. The macroblocks (MBs) of input SVC bitstream are divided into two types, and each type is suitable for pixel- or transform-domain processing respectively. In the pixel-domain transcoding, a fast re-encoding method is proposed based on mode mapping and motion vector (MV) refinement. In the transform-domain transcoding, the quantized transform coefficients together with other motion data are reused directly to avoid re-quantization loss. The drift problem caused by proposed transcoder is solved by compensation techniques for I frame and P frame respectively. Simulation results show that proposed transcoder achieves averagely 96.4% time reduction compared with the full re-encoding method, and outperforms the reference methods in coding efficiency.
ER -