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检索条件"主题词=distributed video coding"

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Wyner-Ziv video coding with side matching for improved side information

引用

2nd IEEE Pacific Rim Symposium on video and Technology

作者： Ko, Bonghyuck Shim, Hiuk Jae Jeon, Byeungwoo Sungkyunkwan Univ Dept Elect & Elect Engn Suwon 440746 South Korea

ISBN: (纸本)9783540771289

To make an encoder extremely simple by eliminating motion prediction/compensation from encoder, source coding with side information has been investigated based on the Wyner-Ziv theorem as the basic coding principle. However, the frame interpolation at decoder which is essential for redundancy elimination makes erroneous side information when the basic assumption of linear motion between frames is not satisfied. In this paper, we propose a new Wyner-Ziv video coding scheme featuring side matching in the frame interpolation to improve the side information. In the proposed scheme, Wyner-Ziv decoder compensates wrong blocks by side information using side matching and bi-directional searching. The noise reduction in side information allows the proposed algorithm to achieve coding improvements not only in bit-rate but also in PSNR. Results of our experiments show improvement of PSNR up to 0.40dB.

关键词： distributed video coding Wyner-Ziv coding side matching

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THE IMPROVED CENTRAL DECODER OF A MULTIPLE DESCRIPTION AND distributed CODEC FOR videoS

THE IMPROVED CENTRAL DECODER OF A MULTIPLE DESCRIPTION AND D...

引用

International Conference on Multimedia and Expo

作者： Lee, Shih-Chieh Jhuang, Jyun-Jie Chen, Ching-Hua Chen, Jiann-Jone Liu, Jun-Lin Shiue, De-Hui Natl Taiwan Univ Sci & Technol EE Dept Taipei Taiwan Ind Technol Res Inst Info & Communs Res Labs Hsinchu Taiwan

ISBN: (纸本)9781424474936

Multiple description coding (MDC) provides stable wireless multimedia communications with the help of multiple transmission paths, while distributed video coding (DVC) effectively shifts the encoder complexity to decoder for mobile media devices. We proposed to combine MDC with DVC, abbreviated as MDVC, to construct a reliable and efficient video codec system. To improve the codec performance, the DPCM prediction gain is exploited from the correlations among sub-video sequences inside the MDVC to increase the reconstructed video quality. In addition, a MDVC central decoder control method, operated dynamically at frame-level, is proposed to improve the adaptation capability, as compared to the current MDC central decoder that selects one best description for the output video. The intra-and inter-correlations among MDC descriptions were investigated to make this frame selection decision for the central decoder. Simulations showed that the proposed MDVC control method demonstrates higher average PSNR and lower PSNR variations of the output videos, with the help of DPCM prediction gain and the efficient central decoder control method that correctly selected high quality WZ frames for low quality key-frames.

关键词： Central Decoder Multiple Description coding distributed video coding Wyner-Ziv Residual coding Side Information

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Impact of the Key Frames Quality on the Overall Wyner-Ziv video coding Performance

Impact of the Key Frames Quality on the Overall Wyner-Ziv Vi...

引用

50th International Symposium ELMAR

作者： Areia, J. D. Pereira, F. Fernando, W. A. C. Inst Super Tecn Inst Telecomunicacoes Ave Rovisco Pais P-1049001 Lisbon Portugal Univ Surrey CCSR Guildford GU2 7XH Surrey England

ISBN: (纸本)9789537044060

distributed video coding (DVC) is a new paradigm based on the Slepian-Wolf and Wyner-Ziv theorems where the temporal redundancy is mainly exploited at the decoder and not anymore at the encoder as in conventional predictive video coding. One of the most popular Wyner-Ziv video coding architectures, the Stanford architecture, splits the video frames into two types of frames: key frames and Wyner-Ziv (WZ) frames. Key frames are typically coded using existing intra coding techniques;these key frames are used at the decoder to estimate the WZ frames generating the so-called side information. Since the side information quality strongly depends on the key frames, this paper investigates the impact of the key frames quality on the WZ frames coding and on the overall video codec RD performance. Results show that there is an upper bound for the key frames quality after which the overall RD performance does not improve. The results will be very useful to develop an efficient encoder rate control solution for an unidirectional DVC codec.

关键词： distributed video coding Wyner-Ziv coding key frames side information RD performance

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MAPPING MOTION VECTORS FOR A WYNER-ZIV video TRANSCODER

MAPPING MOTION VECTORS FOR A WYNER-ZIV VIDEO TRANSCODER

引用

16th IEEE International Conference on Image Processing

作者： Peixoto, Eduardo de Queiroz, Ricardo L. Mukherjee, Debargha Univ Brasilia Brasilia DF Brazil Hewlett Packard Labs Palo Alto CA USA

ISBN: (纸本)9781424456536

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 DPCM/DCT codec. As a proof of concept, we implemented this transcoder using a simple pixel domain WZ codec and the standard H.263+. The transcoder design aims at reducing complexity, since the transcoder has to perform both WZ decoding and DPCM/DCT encoding, including motion estimation. New approaches are used to map motion vectors for such a transcoder. Results are presented to demonstrate the transcoder performance.

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

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DVC Decoding Algorithm Based on Wireless Transmission 11

DVC Decoding Algorithm Based on Wireless Transmission

引用

11th International Conference on Measuring Technology and Mechatronics Automation (ICMTMA)

作者： Yang, Hancheng Yang, Jijun Guangxi Univ Sch Comp Elect & Informat Nanning 530004 Peoples R China Guangxi Univ Finance & Econ Sch Management Sci & Engn Nanning 530004 Peoples R China

ISBN: (纸本)9781728121659

This letter presents an improved distributed video coding (DVC) decoding algorithm is proposed to improve the performance of a multipath fading wireless channel. Considering the influence of channel error on Wyner-Ziv and key frame bit stream, a new noise model is proposed and the algorithm is improved accordingly. Using the W-CDMA wireless channel to simulate the simulation, and analyzing the simulation results, to determine the effect of each change. The simulation results indicate that the proposed improvement has a significant improvement in the performance of the DVC decoder under the adverse channel conditions.

关键词： distributed video coding multipath channels Wyner-Ziv coding

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Parallel Transform Domain Wyner-Ziv video Encoding Scheme for Standard Definition video

Parallel Transform Domain Wyner-Ziv Video Encoding Scheme fo...

引用

IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

作者： Park, Jongbin Jeon, Byeungwoo Sungkyunkwan Univ Sch Informat & Commun Engn Suwon 440746 South Korea

ISBN: (纸本)9781467302937

In this paper, we propose a new structure for the transform domain Wyner Ziv coding to achieve fast and light-weight encoding of standard-definition (SD) video. The proposed scheme divides each picture into multiple tiles which do not have computational dependencies between each other in order to facilitate parallelization. The proposed parallelized encoder is implemented using OpenMP API. In addition, a bit-plane packing parallel LDPCA encoding scheme is also applied for each tile. This scheme does not depend on specific hardware architecture. Compared to MPEG-4 AVC/H.264 INTRA (GOP=2, 8) and x264 encoder without hardware acceleration, the proposed scheme shows faster encoding by 1.5 similar to 1.9 and 2.7 similar to 4.7 times, respectively.

关键词： distributed video coding Parallel Wyner-Ziv video encoding Standard definition video OpenMP

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Scalable Wyner-Ziv video coding with adaptive bit-plane representation

Scalable Wyner-Ziv video coding with adaptive bit-plane repr...

引用

Conference on Visual Communications and Image Processing 2008

作者： Guo, Mei Lu, Yan Wu, Feng Li, Shipeng Gao, Wen Harbin Inst Technol Sch Comp Sci & Technol Harbin 150006 Peoples R China Microsoft Res Asia Beijing 100080 Peoples R China

ISBN: (纸本)9780819469946

Wyner-Ziv video coding is committed to the compression of video with low computing resources. Since the encoding may stop at any time for mobile devices with limited computing resources and bandwidth, it is also desirable to have the scalable Wyner-Ziv video coding. The bit-plane coding is an inherent solution of scalable video coding. However, the conventional bit-plane representation in hybrid video coding does not work well in the scenario of Wyner-Ziv coding. Since the bit-plane representation is closely related to quantization, we propose a new bit-plane representation with optimal quantization at any bit-plane in terms of Wyner-Ziv coding. In particular, for the DCT-domain Wyner-Ziv video coding, the distribution of DCT coefficients and the conditional distribution given side information can be modeled with symmetric Laplacian functions. Accordingly, a simplified adaptive bit-plane representation is proposed without pre-knowing the Laplacian distribution parameters. A DCT-domain scalable Wyner-Ziv video coding scheme is then developed, in which the encoding can stop at any bit-plane and the bit-stream can also be flexibly truncated. The testing has shown that there is no performance penalty due to the unpredicted bit-plane truncation.

关键词： distributed video coding Wyner-Ziv coding bit-plane representation optimal quantization

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SPATIAL-DOMAIN UNIDIRECTIONAL DVC WITH SIDE-INFORMATION DEPENDENT CORRELATION CHANNEL ESTIMATION

SPATIAL-DOMAIN UNIDIRECTIONAL DVC WITH SIDE-INFORMATION DEPE...

引用

16th International Conference on Digital Signal Processing

作者： Deligiannis, Nikos Munteanu, Adrian Clerckx, Tom Cornelis, Jan Schelkens, Peter VUB Interdisciplinary Inst Broadband Technol IBBT Dept Elect & Informat ETRO B-1050 Brussels Belgium

ISBN: (纸本)9781424432974

Present distributed video coding (DVC) approaches assume the correlation channel to be side-information independent (SII). We have recently demonstrated that in reality the correlation channel. in video is side-information dependent (SID) and that DVC systems which make SII assumptions suffer a significant performance penalty, depending entirely on the correlation statistics of the video data. In this paper, we present a novel spatial domain unidirectional DVC codec which is based on a novel SID technique enabling advanced correlation channel estimation at the decoder starting from a partial knowledge of it. Experimental results show that the proposed codec achieves superior performance compared to the state-of-the-art in Wyner-Ziv video coding while operating without a feedback channel.

关键词： distributed video coding correlation channel overlapped block motion estimation probabilistic reconstruction

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Multi-eyed Network Camera for Convenient 3D video Capturing 3

Multi-eyed Network Camera for Convenient 3D Video Capturing

引用

3rd IEEE Global Conference on Consumer Electronics (GCCE)

作者： Sakomizu, Kazuhito Nishi, Takashi Onoye, Takao Oki Elect Ind Co Ltd Corp Res & Dev Ctr Chuo Ku 2-5-7 Hommachi Osaka 5410053 Japan Osaka Univ Dept Informat Syst Engn 1-5 Yamadaoka Suita Osaka 5650871 Japan

ISBN: (纸本)9781479951468

To capture and record a multi-view video is inconvenient due to needing mechanism for synchronization between cameras and computational cost for video coding. This paper presents a multi-eyed network camera which has five fixed HD camera modules and a gigabit Ethernet port. Only one LSI controls the camera modules and encodes all captured videos. To reduce computational complexity and keep synchronization, compressing is based on distributed video coding, and multiplexing is an extension format of the H. 264/MVC NAL structure. Implementation results show that all functions are integrated in the LSI and that the synchronization is kept after transmitting.

关键词： Multi-eyed network camera distributed video coding MVC Implementation

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Optimization of system performance for DVC applications with energy constraints over ad hoc networks

引用

13th International Multimedia Modeling Conference (MMM 2007)

作者： Sun, Lifeng Liang, Ke Yang, Shiqiang Zhong, Yuzhuo Tsinghua Univ Dept Comp Sci & Technol Beijing 100084 Peoples R China Natl Univ Singapore Sch Comp Singapore 117548 Singapore

ISBN: (纸本)9783540694281

We investigate optimization of system performance in the below scenario: capturing and transmitting videos by single or multiple video sensors using distributed video coding (DVC) over ad hoe networks. There is an intrinsic contradiction in this scenario that could affect the system performance: the contradiction between the decoding quality and network lifetime. In this paper, we propose a joint optimization between the decoding quality and network lifetime using a quantitative metric of system performance, which is defined as the amount of collected visual information during the operational time of the video sensor. Based on the proposed metric, an optimal encoding rate is determined, which results in an optimal system performance. The simulation results show that the optimal encoding rate can be determined to achieve the optimal system performance.

关键词： distributed video coding ad hoc networks energy optimization

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