Improved Side Information Generation using Field Coding for Wyner-Ziv Codec

Han, Chanhee; Jeon, Yeong-Il; Lee, Si-Woong

doi:10.5392/jkca.2009.9.11.010

Cited by 5 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, as in the original scheme, a feedback channel is still used to request more parity bits until the decoder reconstruction is successful. An improved side information generation method using field coding has been also proposed in (23). WZ frames are divided into the top and bottom fields as the field coding of a conventional video codec.…”

Section: State-of-the-art In Dsc and Dvcmentioning

confidence: 99%

Distributed Video Coding: Principles and Evaluation of Wavelet-Based Schemes

Bernardini¹,

Rinaldo²,

Zontone³

2011

Effective Video Coding for Multimedia Applications

View full text Add to dashboard Cite

3. a presentation of some original work by the authors on the design and evaluation of wavelet-based video coding;4. an overview of applications of the DVC paradigm to other aspects besides video coding. In particular, we will present results relative to robust transmission of video using an auxiliary DVC stream;5. conclusions, advantages and limitations of the DVC paradigm.In particular, we will introduce an original distributed video coder based on processing the wavelet transform with a modulo-reduction function. The reduced wavelet coefficients are compressed with a wavelet coder. At the receiver side, the statistical properties between similar frames are used to recover the compressed frame. A second contribution is the analysis and the comparison of DVC schemes in two different scenarios: in the first scenario the information frames are separated from the other frames, and they are compressed following the original framework considered for Wyner-Ziv coding. In the second scenario, all the frames are available at the encoder making this an interesting proposal for the design of a low-complexity video coder, with no motion compensation, where the information frames are coded using DSC techniques. The whole set of experiments show that the proposed schemes -that do not use any feedback channel -have good performance when compared to similar asymmetric video compression schemes considered in the literature. Finally, we will consider an original error-resilient scheme that employs distributed video coding tools. A bitstream, produced by any standard motion-compensated predictive codec, is sent over an error-prone channel. A Wyner-Ziv encoded auxiliary bitstream is sent as redundant information to serve as a forward error correction code. We propose the use of an extended version of the Recursive Optimal per-Pixel Estimate (ROPE) algorithm to establish how many parity bits should be sent to the decoder in order to correct the decoded and concealed frames. At the decoder side, error concealed reconstructed frames and parity bits are used by the Wyner-Ziv decoder, and each corrected frame is used as a reference by future frames, thus reducing drift. Tests with video sequences and realistic loss patterns are reported. Experimental results show that the proposed scheme performs well when compared to other schemes that use Forward Error Correcting (FEC) codes or the H.264 standard intra-macroblock refresh procedure. Foundation of Distributed Source CodingIn this section we will introduce in detail two major results provided by Information Theory that prove that, under the DSC paradigm, it is still possible to achieve or to approach, in total generality, the optimal performance of a joint coder: the Slepian-Wolf theorem and the Wyner-Ziv theorem. We first introduce the main ideas behind distributed source coding by means of examples. A glimpse at Distributed Source CodingConsider the case of N distributed sensors that communicate with a data collection center using a radio link. Data recorded by each sensor, at each t...

show abstract

Section: State-of-the-art In Dsc and Dvcmentioning

confidence: 99%

Distributed Video Coding: Principles and Evaluation of Wavelet-Based Schemes

Bernardini¹,

Rinaldo²,

Zontone³

2011

Effective Video Coding for Multimedia Applications

View full text Add to dashboard Cite

show abstract

“…The authors of [9] suggested a multi-frame SI generation approach using adaptive temporal filtering to estimate the pixel values for SI and motion vector filtering for refinement. The interested reader is referred to [10][11][12][13][14][15][16][17] and the references therein for further reading.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Distributed Video Coding in a Quality Assessment Context

Banitalebi¹,

Tohidypour²

2012

AJSP

View full text Add to dashboard Cite

In the popular video coding trend, the encoder has the task to exploit both spatial and temporal redundancies present in the video sequence, which is a complex procedure; As a result almost all video encoders have five to ten times more complexity than their decoders. In a video compression process, one of the main tasks at the encoder side is motion estimation which is to extract the temporal correlation between frames. Distributed video coding (DVC) proposed the idea that can lead to low complexity encoders and higher complexity decoders. DVC is a new paradigm in video compression based on the information theoretic ideas of Slepian-Wolf and Wyner-Ziv theorems. Wyner-Ziv coding is naturally robust against transmission errors and can be used for joint source and channel coding. Side Information is one of the key components of the Wyner-Ziv decoder. Better side information generation will result in better functionality of Wyner-Ziv coder. In this paper we proposed a new method that can generate side information with a better quality and thus better compression. We've used HVS (human visual system) based image quality metrics as our quality criterion. The motion estimation we've used in the decoder is modified due to these metrics such that we could obtain finer side information. The motion compensation is optimized for perceptual quality metrics and leads to better side information generation compared to conventional MSE (mean squared error) or SAD (sum of absolute difference) based motion compensation currently used in the literature. Better motion compensation means better compression.

show abstract

“…c) also computational expensive square operations are used in variance and threshold calculation which is hardware inconvenient in both encoder and decoder side. In order to reduce the intra mode bits, methods for estimating the most probable mode (MPM) are presented in (Kim et al, 2008, Lee et al, 2009. But the performance improvements are not significant.…”

Section: Introductionmentioning

confidence: 99%

Effective Video Coding for Multimedia Applications

Sudhakar¹

2011

View full text Add to dashboard Cite

show abstract

Improved Side Information Generation using Field Coding for Wyner-Ziv Codec

Cited by 5 publications

References 15 publications

Distributed Video Coding: Principles and Evaluation of Wavelet-Based Schemes

Distributed Video Coding: Principles and Evaluation of Wavelet-Based Schemes

Exploring the Distributed Video Coding in a Quality Assessment Context

Effective Video Coding for Multimedia Applications

Contact Info

Product

Resources

About