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Efficient transcoding for spatially misaligned compositions for HEVC

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HPC-UGent: the central High Performance Computing infrastructure of Ghent University
Abstract
The visualization of (ultra) high-resolution compositions created from multiple input bitstreams requires several decoders at the receiving device. Therefore, not all devices can properly display such compositions. To address this problem, the input streams are decoded, merged into a single video, and re-encoded by a transcoder in the network. However, this approach requires a computationally complex re-encoding step. To reduce this complexity, information from the input bitstreams can be reused during transcoding. In HEVC, simply reusing the original encoding information is not compression efficient if the inserted content is not aligned with the grid of coded blocks. In this paper, we applied feature selection based on a decision tree, which was used in a fast HEVC transcoding model for misaligned content. The performance varies depending on the shift and average transform size in the original sequence, resulting in complexity reductions of up to 76%.
Keywords
HEVC, VIDEO CODING HEVC, transcoding, picture composition, H.264/AVC

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Citation

Please use this url to cite or link to this publication:

MLA
De Praeter, Johan et al. “Efficient Transcoding for Spatially Misaligned Compositions for HEVC.” IEEE International Conference on Image Processing ICIP. 2014. 2487–2491. Print.
APA
De Praeter, J., De Cock, J., Van Wallendael, G., Van Leuven, S., Lambert, P., & Van de Walle, R. (2014). Efficient transcoding for spatially misaligned compositions for HEVC. IEEE International Conference on Image Processing ICIP (pp. 2487–2491). Presented at the International Conference on Image Processing (ICIP 2014).
Chicago author-date
De Praeter, Johan, Jan De Cock, Glenn Van Wallendael, Sebastiaan Van Leuven, Peter Lambert, and Rik Van de Walle. 2014. “Efficient Transcoding for Spatially Misaligned Compositions for HEVC.” In IEEE International Conference on Image Processing ICIP, 2487–2491.
Chicago author-date (all authors)
De Praeter, Johan, Jan De Cock, Glenn Van Wallendael, Sebastiaan Van Leuven, Peter Lambert, and Rik Van de Walle. 2014. “Efficient Transcoding for Spatially Misaligned Compositions for HEVC.” In IEEE International Conference on Image Processing ICIP, 2487–2491.
Vancouver
1.
De Praeter J, De Cock J, Van Wallendael G, Van Leuven S, Lambert P, Van de Walle R. Efficient transcoding for spatially misaligned compositions for HEVC. IEEE International Conference on Image Processing ICIP. 2014. p. 2487–91.
IEEE
[1]
J. De Praeter, J. De Cock, G. Van Wallendael, S. Van Leuven, P. Lambert, and R. Van de Walle, “Efficient transcoding for spatially misaligned compositions for HEVC,” in IEEE International Conference on Image Processing ICIP, Paris, France, 2014, pp. 2487–2491.
@inproceedings{5972892,
  abstract     = {The visualization of (ultra) high-resolution compositions created from multiple input bitstreams requires several decoders at the receiving device. Therefore, not all devices can properly display such compositions. To address this problem, the input streams are decoded, merged into a single video, and re-encoded by a transcoder in the network. However, this approach requires a computationally complex re-encoding step. To reduce this complexity, information from the input bitstreams can be reused during transcoding. In HEVC, simply reusing the original encoding information is not compression efficient if the inserted content is not aligned with the grid of coded blocks. In this paper, we applied feature selection based on a decision tree, which was used in a fast HEVC transcoding model for misaligned content. The performance varies depending on the shift and average transform size in the original sequence, resulting in complexity reductions of up to 76%.},
  author       = {De Praeter, Johan and De Cock, Jan and Van Wallendael, Glenn and Van Leuven, Sebastiaan and Lambert, Peter and Van de Walle, Rik},
  booktitle    = {IEEE International Conference on Image Processing ICIP},
  isbn         = {9781479957514},
  issn         = {1522-4880},
  keywords     = {HEVC,VIDEO CODING HEVC,transcoding,picture composition,H.264/AVC},
  language     = {eng},
  location     = {Paris, France},
  pages        = {2487--2491},
  title        = {Efficient transcoding for spatially misaligned compositions for HEVC},
  year         = {2014},
}

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