Dependency channel modeling for a LDPC-based Wyner-Ziv video compression scheme

Westerlaken, R.P.; Borcheri, S.; Gunnewiek, R.K.; Lagendijk, R.L.

doi:10.1109/icip.2006.313179

Cited by 12 publications

(8 citation statements)

References 9 publications

(11 reference statements)

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“…In previous work, e.g. [5] and [6], the authors use the following Laplacian distribution to model the residual between the original WZ frame and the SI fame, as shown in (4).…”

Section: B Online Correlation Parameters Estimationmentioning

confidence: 99%

“…Therefore, how to get the accurate correlation noise model is a crucial problem. In [5] and [6], we can observe that during the modeling of the correlation noise distribution, the correlation noise model (CNM) parameter has a fixed value obtained through a training stage using several video sequences, which is named offline It is not precise because the SI quality can vary along the sequence or even within each frame. Also, it is unrealistic to get the SI at encoder or get the WZ frame at decoder.…”

Section: Introductionmentioning

confidence: 99%

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An improved framework of distributed video codec

Wang

Huang

et al. 2011

2011 18th International Conference on Telecommunications

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Recently, distributed video coding (DVC) has become a hot research topic, as its low complexity encoder and high complixty decoder can suit for many emerging applications. However, the practical performance gap between DVC and traditional video coding is still large and need more research about it. In this paper, we propose to exploit the capabilities of side information (SI) extraction, online estimation of correlation noise model (CNM) parameters and joint bitplane decoding to construct an integrated and improved DVC framework for better system performance. The SI extraction along with online CNM parameters estimation is exploited to help decoding, and the joint bitplane decoding that we propose in this paper is used to reduce the transmission rate for the same PSNR performance. The experimental results show that the proposed DVC architecture could work efficiently and improve the PSNR performance by 2-3db for the test sequence.

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“…In previous work, e.g. [5] and [6], the authors use the following Laplacian distribution to model the residual between the original WZ frame and the SI fame, as shown in (4).…”

Section: B Online Correlation Parameters Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An improved framework of distributed video codec

Wang

Huang

et al. 2011

2011 18th International Conference on Telecommunications

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“…In [5], alternative models for the virtual channel were considered. The Laplace model was compared to Generalized Gaussian (GG), Gaussian and double-Gamma models.…”

Section: Stationary Modeling Of Joint Distributionmentioning

confidence: 99%

On joint distribution modeling in distributed video coding systems

Priziment

Malah

2010

2010 IEEE International Workshop on Multimedia Signal Processing

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Performance of a distributed video coding system depends, to a large extent, on the accuracy of joint source and side information distribution modeling. In this work we first examine a family of stationary joint distribution models. As one of our findings, we propose to use the double-Gamma model as an alternative to the widely adopted Laplace model, due to its superior performance. In addition, we suggest a new spatially adaptive model, which enables to follow the spatially varying joint statistics of the source and side information. We present two methods, class-based and neighborhood-based, for estimation of the spatially varying model parameters. We then show how the obtained pixel domain model can be used in the transform domain to facilitate utilization of frame spatial redundancy. Integration of the proposed models into a distributed video coding system resulted in improved performance.

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“…The most common distributed video coders are WZ video coders implemented with error correcting codes such as syndrome codes [18,26,27], turbo codes [1-10, 13, 17, 19, 22,23] and low-density parity-check (LDPC) codes [11,14,15,24,26,27]. 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].…”

Section: Introductionmentioning

confidence: 99%

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

Morbée

Roca

Prades-Nebot

et al. 2007

SIViP

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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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Dependency channel modeling for a LDPC-based Wyner-Ziv video compression scheme

Cited by 12 publications

References 9 publications

An improved framework of distributed video codec

An improved framework of distributed video codec

On joint distribution modeling in distributed video coding systems

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

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