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Sequential motion estimation using luminance and chrominance information for distributed video coding of Wyner-Ziv frames

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ELECTRONICS LETTERS 2006年第7期42卷 398-399页

作者： Adikari, A. B. B. Fernando, W. A. C. Arachchi, H. Kodikara Weerakkody, W. A. R. J. Brunel Univ Sch Engn & Design Uxbridge UB8 3PH Middx England

Proposed is a novel side information refinement technique for Wyner-Ziv video frames in distributed video coding using sequential motion compensation with luminance and chrominance information for a given bit plane to update the side information for the next bit plane. Simulation results show that over 3 dB PSNR gain can be obtained with the proposed algorithm over the best available pixel domain Wyner Ziv codec from the literature [Natario et al.] at the same bit rate.

关键词： brightness image sequences motion estimation video coding Wyner Zivcodec Wyner-Ziv video frames chrominance information distributed video coding luminanceinformation sequential motion estimation side information refinement

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Efficient reconstruction scheme for transform domain Wyner-Ziv video coding

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The Journal of China Universities of Posts and Telecommunications 2010年第4期17卷 52-57页

作者： WANG Feng-qin FAN Yang-yu JIA Meng CHEN Yan School of Electronics and Information Northwestern Polytechnical University Xi'an 710072 China School of Computer and Communication Engineering Zhengzhou University of Light Industry Zhengzhou 450002 China

To minimize the errors of the reconstructed values and improve the quality of decoded image, an efficient reconstruction scheme for transform domain Wyner-Ziv （WZ） video coding is proposed. The reconstruction scheme exploits temporal correlation of the coefficient bands, the WZ decoded bits stream and the side information efficiently. When side information is outside the decoded quantization bin, the reconstructed value is derived using expectation of the WZ decoded bit stream and the side information. When side information is within the decoded quantization bin, the reconstructed value is derived using the biased predictor. Simulation results show that the proposed reconstruction scheme gains up to 1.32 dB compared with the commonly used boundary reconstruction scheme at the same bit rates and similar computation cost.

关键词： distributed video coding WZ video coding, transform domain reconstruction

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Graph Matching Based Side Information Generation for distributed Multi-view video coding

Graph Matching Based Side Information Generation for Distrib...

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IEEE International Conference on Communications (ICC 2009)

作者： Lv, Hui Xiong, Hongkai Song, Li He, Zhihai Chen, Tsuhan Shanghai Jiao Tong Univ Dept Elect Engn Shanghai 200240 Peoples R China Univ Missouri Dept Elect & Comp Engn Columbia MO 65211 USA Carnegie Mellon Univ Dept Elect & Comp Engn Pittsburgh PA 15213 USA

ISBN: (纸本)9781424434343

In this paper, we adopt constrained relaxation for distributed multi-view video coding (DMVC). The novel framework integrates the graph-based segmentation and matching to generate inter-view correlated side information without knowing the camera parameters. Moreover, graph-based representations of multi-view images are incorporated to form more distinctive feature constraints. The sparse data as a good hypothesis space aim for a best matching optimization of inter-view side information with compact syndromes, from inferred relaxed coset. The plausible filling-in from a priori feature constraints between neighboring views could reinforce a promising compensation to inter-view side information generation for joint multi-view decoding. In order to find distinctive feature matching with a more stable approximation, PCA-SIFT and TPS (thin plate spline) are adopted to reduce the dimension of SIFT descriptors and construct a more accurate inter-view motion model. The experimental results validate the high estimation precision and the rate-distortion improvements.

关键词： Multi-view video coding distributed video coding PCA-SIFT thin plate spline graph-based segmentation

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A Wyner-Ziv video Transcoder

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR video TECHNOLOGY 2010年第2期20卷 189-200页

作者： Peixoto, Eduardo de Queiroz, Ricardo L. Mukherjee, Debargha Univ Brasilia Dept Elect Engn BR-70910900 Brasilia DF Brazil Hewlett Packard Labs Palo Alto CA 94304 USA

Wyner-Ziv (WZ) coding of video utilizes simple encoders and highly complex decoders. A transcoder from a WZ codec to a traditional codec can potentially increase the range of applications for WZ codecs. We present a transcoder scheme from the most popular WZ codec architecture to a differential pulse code modulation/discrete cosine transform codec. As a proof of concept, we implemented this transcoder using a simple pixeldomain WZ codec and the standard H.263+. The transcoder design aims at reducing complexity as a large amount of computation is saved by reusing the motion estimation, calculated at the side information generation process, and the I-frame streams. New approaches are used to generate side information and to map motion vectors for the transcoder. Results are presented to demonstrate the transcoder performance.

关键词： distributed video coding H.263+ transcoder Wyner-Ziv coding

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DVC bitstream reorganiser for mobile devices

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ELECTRONICS LETTERS 2010年第17期46卷 1228-U88页

作者： Kim, C. K. Park, J. Suh, D. Y. Jeon, B. Kyung Hee Univ Coll Elect & Informat Yongin 449701 Kyunggi South Korea Sungkyunkwan Univ Dept Elect & Elect Engn Suwon 440746 South Korea

Mobile-to-mobile video communications require both an encoder and a decoder to have low complexity. distributed video coding (DVC) shifts the complexity to the decoder, resulting in a low-complexity encoder suitable for wireless transmission of videos. However, high complexity at the DVC decoder side makes it difficult for resource-constrained mobile devices to perform decoding. Proposed is a solution that is called a DVC bitstream reorganiser. This reorganiser estimates block-wise motion vectors and sends the motion information and the parity data required for decoding to the decoder which reduces the complexity associated with side information generation and repetitive channel decoding. Simulations demonstrate that the decoding speed of the proposed method is 10 to 25 times faster than before.

关键词： DVC bitstream reorganiser DVC decoder distributed video coding mobile communication mobile devices mobile-to-mobile video communications video coding

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Adaptive reconstruction scheme using neighbour pixels in PDWZ coding

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ELECTRONICS LETTERS 2010年第9期46卷 626-U43页

作者： Shim, S. -Y. Han, J. -K. Bae, J. Sejong Univ Dept Informat & Commun Engn Seoul 143747 South Korea

distributed video coding (DVC) is an emerging video coding technology that utilises information theory for distributed sources to build a very simple encoder. In the DVC codec, the reconstruction function for the Wyner-Ziv (WZ) frame is one of the most important modules for improving the quality of the decoded image. An efficient reconstruction algorithm is proposed that uses neighbour pixel information. Simulation results show that the proposed algorithm improves the quality of the decoded image without an increase in the bit rate.

关键词： DVC PDWZ coding Wyner-Ziv frame adaptive reconstruction scheme decoded image distributed video coding neighbour pixels reconstruction function video coding video coding technology

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A sequential motion compensation refinement technique for distributed video coding of Wyner-Ziv frames

A sequential motion compensation refinement technique for di...

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IEEE International Conference on Image Processing (ICIP 2006)

作者： Adikari, A. B. B. Fernando, W. A. C. Weerakkody, W. A. R. J. Arachchi, H. K. Brunel Univ Sch Engn & Design Uxbridge UB8 3PH Middx England

ISBN: (纸本)9781424404810

distributed video coding (DVC) is one of the fastest growing coding techniques in the current signal processing world. It has its outstanding low complex encoder which is essential for some applications in the consumer market. Driven by the above motive, in this paper we propose a novel side information refinement technique for Wyner-Ziv video frames in DVC. When a bit plane is decoded, it is used to replace the corresponding bit plane in the side information and used for motion estimation and compensation to up date the side information. Then the information for the next bit plane is extracted from the updated side information and is sent to the turbo decoder as in a conventional DVC decoder. This process is repeated until all bit planes are extracted. This technique can be employed with almost all the side information generation techniques from simplest conventional pixel interpolation to advanced techniques such as bi-directional motion estimation and spatial motion smoothing (BiMESS) [8]. Simulation results show that over 1.4dB PSNR gain can be obtained with the proposed algorithm over the BiMESS smoothing algorithm at the same bit rate.

关键词： distributed video coding video coding signal processing video codecs

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An approach to distributed video coding using 3D face models

An approach to distributed video coding using 3D face models

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IEEE International Conference on Image Processing (ICIP 2006)

作者： Artigas, Xavi Torres, Luis Tech Univ Catalonia Barcelona Spain

ISBN: (纸本)9781424404810

distributed Source coding (DSC), formulated thirty years ago, is lately witnessing a great research effort. This effort is encouraged by emerging new applications that could greatly benefit from the properties inherent to DSC, like low complexity encoders and embedded error resilience. Among the challenging topics related to DSC there is the generation of the Side Information, an estimation made by the decoder of the information being decoded. This paper quickly summarizes the theoretical bases of DSC and then focuses on the essential task of generating the Side Information, by developing the model-based method drafted by the authors on a previous publication. It is shown that the application of model-based Side Information generation techniques on top of current state of the art DSC-based video codecs provides an improvement of 0.5 to 0.75dB over a wide range of bit-rates. Comparisons against H.264 are also provided.

关键词： distributed video coding Wyner-Ziv coding side information model-based coding

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Bridging the Gap between video Data Acquisition, Compression and Transmission under Emerging Technologies and Scenarios

Bridging the Gap between Video Data Acquisition, Compression...

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IEEE International Conference on Automation, Quality and Testing, Robotics (AQTR)

作者： Meza, Serban-Nicolae Vlaicu, Aurel Orza, Bogdan Tech Univ Cluj Napoca Cluj Napoca Romania

ISBN: (纸本)9781424467259

video data is currently one of the mostly used/desired data that circulates today's digital environment. The paper aims at providing an overview on the emerging trends in the theoretical research that sustains the development of future, more efficient, acquisition, compression and transmission architectures for video. The focus is on delivering a good starting point in what compressive sampling and distributed video coding are all about and infer on scenarios that will mostly benefit from their advancement. It is concluded that 3D video and multi-purpose wireless mobile devices are some of the key emerging technologies that are likely to embrace these important theoretical results and transfer them into practice.

关键词： distributed video coding compressive sampling 3D video stereo vision wireless devices

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Wavelet-domain distributed video coding with motion-compensated refinement

Wavelet-domain distributed video coding with motion-compensa...

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IEEE International Conference on Image Processing (ICIP 2006)

作者： Wang, Anhong Zhao, Yao Wei, Lei Beijing Jiatong Univ Inst Informat Sci Beijing Peoples R China Taiyuan Univ Sci & Technol Taiyuan Peoples R China

ISBN: (纸本)9781424404810

In this paper, we propose a distributed video coding (DVC) paradigm based on lattice vector quantization in wavelet domain. In this framework, we use a fine and a coarse lattice vector quantizer to wavelet coefficients and the difference of two lattice quantizers is coded by Turbo encoder. At decoder, side information is gradually updated by motion-compensated refinement. The refinement is built on partially decoded current frame and we give its matching strategy. Due to the refinement, burden of Turbo encoding is cut down, bit rate is saved and the reconstruction is improved to some degree.

关键词： distributed source coding distributed video coding video coding processing

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