Generic techniques to reduce SVC enhancement layer encoding complexity

Leuven, Sebastiaan Van; Cock, Jan De; Garrido-Cantos, Rosario; Martínez, José Luis; Walle, Rik Van de

doi:10.1109/tce.2011.5955229

Cited by 8 publications

(2 citation statements)

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“…The mode decision complexity of the closed-loop transcoding is reduced based on previous analysis [9], [10]. Furthermore, the complexity of the list prediction is reduced, as suggested in [11]. encoded as an H.264/AVC bitstream where different quantisation parameters were applied: QP AV C ∈ {22, 27, 32, 37}.…”

Section: Proposed Systemmentioning

confidence: 99%

Complexity scalable H.264/AVC-to-SVC transcoding

Leuven

Cock

Wallendael

et al. 2013

2013 IEEE International Conference on Consumer Electronics (ICCE)

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Transcoding techniques require a high complexity and reduce the video quality with every transcoding step. When transcoding an input bitstream to scalable video coding (SVC), only one adaptation step is required and a scaled bitstream is extractable afterwards. To reduce the H.264/AVC-to-SVC transcoding complexity, we propose a transcoding architecture which combines optimized closed-and open-loop transcoding techniques. This transcoder scales the complexity depending on the available resources. Relative to a cascaded decoder-encoder the complexity can be reduced by 99.28%, while a high rate distortion efficiency is maintained and a high degree of scalability guaranteed.

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Section: Proposed Systemmentioning

confidence: 99%

Complexity scalable H.264/AVC-to-SVC transcoding

Leuven

Cock

Wallendael

et al. 2013

2013 IEEE International Conference on Consumer Electronics (ICCE)

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“…Since such cascaded decoder-encoder results in a high complexity, the encoder complexity is reduced by optimizing the mode decision for both the base and enhancement layer. This is in contrast to fast mode decision methods for SVC, which typically only adjusts the enhancement layer encoding depending on the base layer macroblock [10]- [12]. However, a correlation between colocated macroblocks in H.264/AVC input and SVC output bitstreams has been shown [13], and the base layer quality decreases so a macroblock mode with identical or a coarser partitioning is selected as the rate-distortion (RD)-optimal.…”

Section: B Closed-loop Transcodermentioning

confidence: 99%

A complexity-scalable hybrid H.264/AVC-to-SVC transcoder

Leuven

Cock

Wallendael

et al. 2013

IEEE Trans. Consumer Electron.

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Transcoding of H.264/AVC bitstreams is frequently used for adapting video streams to varying network conditions or different end-user device characteristics. Transcoding requires a relatively high complexity (and thus high operational cost) for each adaptation operation, and possibly reduces the video quality. In comparison, transcoding the input bitstream to SVC requires only one adaptation step. Afterwards, the resulting SVC bitstream can be adapted instantly. To reduce the H.264/AVC-to-SVC transcoding complexity, a transcoding architecture which combines existing open-loop transcoding techniques with optimized closed-loop transcoding is proposed. Furthermore, this approach allows to scale the complexity of the system. Doing so, compared with a cascaded decoder-encoder only 8.48% of the complexity is required for the highest complexity, while a high rate-distortion efficiency is maintained and a high degree of scalability is guaranteed. When only limited resources are available, the transcoding complexity can be scaled such that over 99% of the complexity is reduced compared to a cascaded decoder-encoder 1 .

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