Iterative Wyner-Ziv decoding and successive side-information refinement in feedback channel-free hash-based distributed video coding

Verbist, Frederik; Deligiannis, Nikos; Satti, Shahid M.; Munteanu, Adrian; Schelkens, Peter

doi:10.1117/12.929680

Cited by 6 publications

(10 citation statements)

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“…Endnotes a This paper has been presented in part in the Proceedings of SPIE, 2012 [12]. The execution time tests used the executables of the JM implementation of H.264/AVC and the proposed system with were conducted under the same hardware and software conditions.…”

Section: Discussionmentioning

confidence: 99%

“…In this context, preliminary results of the proposed feedback-free architecture without any encoder-side mode decision were presented in [12]. The experimental results presented in this work, however, show the benefit of the different coding modes available to the proposed system and clarify their influence on the compression performance.…”

Section: Contributionsmentioning

confidence: 99%

“…To this end, the compression performance of four versions of the proposed system is assessed. The first version only supports the SW coding mode and essentially corresponds to our previous system presented in [12]. The second and third versions support an additional skip (SW+Skip) or intra (SW+Intra) coding mode, respectively.…”

Section: Mode Selection Evaluationmentioning

confidence: 99%

“…The experimental results presented in this work illustrate the benefit of the different coding modes available to the proposed system and clarify their influence on the compression performance. Additionally, in contrast to [12], the experimental results include an analysis of the impact of the lowcomplexity SI approximation methods on the overall RD performance and the encoding complexity. The compression performance of the proposed feedback-free system is compared to a collection of alternative feedback-based DVC systems, including the benchmark DISCOVER [13] codec.…”

Section: Introductionmentioning

confidence: 99%

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Encoder-driven rate control and mode decision for distributed video coding

Verbist

Deligiannis

Satti

et al. 2013

EURASIP J. Adv. Signal Process.

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To provide low-complexity encoding for video in unidirectional or offline compression scenarios, this paper proposes an efficient feedback-channel-free distributed video coding architecture featuring a novel encoder-driven rate control scheme in tandem with a designated mode selection process. To this end, the encoder features a novel low-complexity motion estimation technique to approximate the side-information (SI) available at the decoder. Then, a SI-dependent correlation channel estimation between the approximated SI and the original frames is used to derive the theoretically required rate for successful Slepian-Wolf (SW) decoding. Based on the evaluation of the expected trade-off between the estimated required coding rate and the estimated distortion outcome, a novel encoder-side mode decision module assigns a different coding mode to distinct portions of the coded frames. In this context, skip, intra and SW coding modes are supported. To reduce the effect of underestimation, the final SW rate is adjusted upwards using a novel rate formula. Additionally, a successive SI refinement technique is exploited at the decoder to decrease the number of SW decoding failures. Experimental results illustrate the benefit of the different coding options and show similar or superior compression performance with respect to the feedback-based DISCOVER benchmark system. Finally, the low-complexity encoding characteristics of the proposed system are confirmed, as well as the beneficial impact of the proposed scheme on the decoding complexity.

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Section: Discussionmentioning

confidence: 99%

Section: Contributionsmentioning

confidence: 99%

Section: Mode Selection Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Encoder-driven rate control and mode decision for distributed video coding

Verbist

Deligiannis

Satti

et al. 2013

EURASIP J. Adv. Signal Process.

Self Cite

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“…A system similar to [10] but for transform-domain DVC was presented in [15], where a multi-mode SI method was used at the encoder. More advanced and complete attempts at creating and analysing a feedback-free DVC system were presented in [16] and [17]. These systems rely on performing reduced complexity motion estimation at the encoder.…”

Section: Overview Of the Previous Workmentioning

confidence: 99%

Suppressing feedback in a distributed video coding system by employing real field codes

Louw

Kaneko

2013

EURASIP J. Adv. Signal Process.

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Single-view distributed video coding (DVC) is a video compression method that allows for the computational complexity of the system to be shifted from the encoder to the decoder. The reduced encoding complexity makes DVC attractive for use in systems where processing power or energy use at the encoder is constrained, for example, in wireless devices and surveillance systems. One of the biggest challenges in implementing DVC systems is that the required rate must be known at the encoder. The conventional approach is to use a feedback channel from the decoder to control the rate. Feedback channels introduce their own difficulties such as increased latency and buffering requirements, which makes the resultant system unsuitable for some applications. Alternative approaches, which do not employ feedback, suffer from either increased encoder complexity due to performing motion estimation at the encoder, or an inaccurate rate estimate. Inaccurate rate estimates can result in a reduced average rate-distortion performance, as well as unpleasant visual artifacts. In this paper, the authors propose a single-view DVC system that does not require a feedback channel. The consequences of inaccuracies in the rate estimate are addressed by using codes defined over the real field and a decoder employing successive refinement. The result is a codec with performance that is comparable to that of a feedback-based system at low rates without the use of motion estimation at the encoder or a feedback path. The disadvantage of the approach is a reduction in average rate-distortion performance in the high-rate regime for sequences with significant motion.

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