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Efficient low-delay distributed video coding

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Abstract
Distributed video coding (DVC) is a video coding paradigm that allows for a low-complexity encoding process by exploiting the temporal redundancies in a video sequence at the decoder side. State-of-the-art DVC systems exhibit a structural coding delay since exploiting the temporal redundancies through motion-compensated interpolation requires the frames to be decoded out of order. To alleviate this problem, we propose a system based on motion-compensated extrapolation that allows for efficient low-delay video coding with low complexity at the encoder. The proposed extrapolation technique first estimates the motion field between the two most recently decoded frames using the Lucas-Kanade algorithm. The obtained motion field is then extrapolated to the current frame using an extrapolation grid. The proposed techniques are implemented into a novel architecture featuring hybrid block-frequency Wyner-Ziv coding as well as mode decision. Results show that having references from both temporal directions in interpolation provides superior rate-distortion performance over a single temporal direction in extrapolation, as expected. However, the proposed extrapolation method is particularly suitable for low-delay coding as it performs better than H.264/AVC intra, and it is even able to outperform the interpolation-based DVC codec from DISCOVER for several sequences.
Keywords
motion-compensated extrapolation, low-delay coding, Distributed video coding (DVC), INFORMATION

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MLA
Skorupa, Jozef, Jürgen Slowack, Stefaan Mys, et al. “Efficient Low-delay Distributed Video Coding.” IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 22.4 (2012): 530–544. Print.
APA
Skorupa, J., Slowack, J., Mys, S., Deligiannis, N., De Cock, J., Lambert, P., Grecos, C., et al. (2012). Efficient low-delay distributed video coding. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, 22(4), 530–544.
Chicago author-date
Skorupa, Jozef, Jürgen Slowack, Stefaan Mys, Nikos Deligiannis, Jan De Cock, Peter Lambert, Christos Grecos, Adrian Munteanu, and Rik Van de Walle. 2012. “Efficient Low-delay Distributed Video Coding.” Ieee Transactions on Circuits and Systems for Video Technology 22 (4): 530–544.
Chicago author-date (all authors)
Skorupa, Jozef, Jürgen Slowack, Stefaan Mys, Nikos Deligiannis, Jan De Cock, Peter Lambert, Christos Grecos, Adrian Munteanu, and Rik Van de Walle. 2012. “Efficient Low-delay Distributed Video Coding.” Ieee Transactions on Circuits and Systems for Video Technology 22 (4): 530–544.
Vancouver
1.
Skorupa J, Slowack J, Mys S, Deligiannis N, De Cock J, Lambert P, et al. Efficient low-delay distributed video coding. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY. 2012;22(4):530–44.
IEEE
[1]
J. Skorupa et al., “Efficient low-delay distributed video coding,” IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, vol. 22, no. 4, pp. 530–544, 2012.
@article{2106724,
  abstract     = {Distributed video coding (DVC) is a video coding paradigm that allows for a low-complexity encoding process by exploiting the temporal redundancies in a video sequence at the decoder side. State-of-the-art DVC systems exhibit a structural coding delay since exploiting the temporal redundancies through motion-compensated interpolation requires the frames to be decoded out of order. To alleviate this problem, we propose a system based on motion-compensated extrapolation that allows for efficient low-delay video coding with low complexity at the encoder. The proposed extrapolation technique first estimates the motion field between the two most recently decoded frames using the Lucas-Kanade algorithm. The obtained motion field is then extrapolated to the current frame using an extrapolation grid. The proposed techniques are implemented into a novel architecture featuring hybrid block-frequency Wyner-Ziv coding as well as mode decision. Results show that having references from both temporal directions in interpolation provides superior rate-distortion performance over a single temporal direction in extrapolation, as expected. However, the proposed extrapolation method is particularly suitable for low-delay coding as it performs better than H.264/AVC intra, and it is even able to outperform the interpolation-based DVC codec from DISCOVER for several sequences.},
  author       = {Skorupa, Jozef and Slowack, Jürgen and Mys, Stefaan and Deligiannis, Nikos and De Cock, Jan and Lambert, Peter and Grecos, Christos and Munteanu, Adrian and Van de Walle, Rik},
  issn         = {1051-8215},
  journal      = {IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY},
  keywords     = {motion-compensated extrapolation,low-delay coding,Distributed video coding (DVC),INFORMATION},
  language     = {eng},
  number       = {4},
  pages        = {530--544},
  title        = {Efficient low-delay distributed video coding},
  url          = {http://dx.doi.org/10.1109/TCSVT.2011.2168289},
  volume       = {22},
  year         = {2012},
}

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