Rate Allocation Algorithm for Pixel-Domain Distributed Video Coding Without Feedback Channel

Morbée, Marleen; Prades-Nebot, J.; Pižurica, Aleksandra; Philips, Wilfried

doi:10.1109/icassp.2007.366731

Cited by 54 publications

(76 citation statements)

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“…The WZ video coders can be divided into two classes: the scalable coders [4,8,17], and the non-scalable coders [3]. The scalable coders have the advantages that the rate can be flexibly adapted and that the rate control is easier than in the non-scalable case.…”

Section: General Scheme Of a Scalable Pdwz Video Codermentioning

confidence: 99%

“…The final aim is to reduce the decoder complexity and the latency to a minimum, while maintaining very near-to-optimal rate-distortion (RD) performance. The proposed method is related to our previous work [17], where we studied a rate allocation algorithm for PDWZ video coders without feedback channel. In this paper, however, we focus on the PDWZ video coder with feedback channel.…”

Section: Introductionmentioning

confidence: 99%

“…Some proposed coding schemes apply WZ coding to the pixel values of the video signal and are therefore called pixel-domain Wyner-Ziv (PDWZ) video coders [3-8, 10, 13, 17, 19, 22, 23]; other approaches exploit the statistical dependencies within a frame by applying an image transform and are categorized as transform-domain WZ video coders [2,9,11,14,18,26,27]. In this paper, we focus on the turbo code-based PDWZ video coding architecture, as it is well known in literature [4,5,7,8,13,17,23].…”

Section: Introductionmentioning

confidence: 99%

“…We utilize this feedback channel to improve the RA and to achieve very near-to-optimal RD performance while at the same time eliminating the main feedback channel inconveniences, i.e., its negative impact on latency and decoder complexity. Moreover, the PDWZ video coder used in this work has been improved compared to [17] in three respects. Firstly, in this work we take into account previously decoded bit planes (BPs) for the turbo decoding of each BP.…”

Section: Introductionmentioning

confidence: 99%

“…Firstly, in this work we take into account previously decoded bit planes (BPs) for the turbo decoding of each BP. Secondly, the estimation of the encoding rate in [17] was based on experimentally obtained performance graphs of the turbo codes, while in this paper we derive expressions for the encoding rate founded on information theory concepts. Thirdly, the estimation of the variance for the assumed Laplacian model of the correlation noise has been refined, since we dispose of a feedback channel which allows us to transmit to the encoder an additional decoder estimate of the variance.…”

Section: Introductionmentioning

confidence: 99%

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Reduced decoder complexity and latency in pixel-domain Wyner–Ziv video coders

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In some video coding applications, it is desirable to reduce the complexity of the video encoder at the expense of a more complex decoder. Wyner-Ziv (WZ) video coding is a new paradigm that aims to achieve this. To allocate a proper number of bits to each frame, most WZ video coding algorithms use a feedback channel, which allows the decoder to request additional bits when needed. However, due to these multiple bit requests, the complexity and the latency of WZ video decoders increase massively. To overcome these problems, in this paper we propose a rate allocation (RA) algorithm for pixel-domain WZ video coders. This algorithm estimates at the encoder the number of bits needed for the decoding of every frame while still keeping the encoder complexity low. Experimental results show that, by using our RA algorithm, the number of bit requests over the feedback channel -and hence, the decoder complexity and the latency -are significantly reduced. Meanwhile, a very near-to-optimal rate-distortion performance is maintained.

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Section: General Scheme Of a Scalable Pdwz Video Codermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%