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检索条件"主题词=Distributed video coding"

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A Novel Content-Based Side-Information Generation Approach for distributed video coding

A Novel Content-Based Side-Information Generation Approach f...

引用

WASE International Conference on Information Engineering (ICIE 2009)

作者： Wei, Yiduo Liu, Xiaodong Tsinghua Univ Grad Sch Shenzhen Broadband Networks & Multimedia Res Ctr Shenzhen 518057 Peoples R China

ISBN: (纸本)9780769536798

the performance of distributed video coding (DVC) has a great reliance on the accuracy of side-information, which is estimated according to the intra-coded key frames that are assumed to be reconstructed lossless in this paper. A novel content-based side-information generation approach is proposed to improve the Wyner-Ziv frame estimation. First, the motion features and texture features are extracted and used to segment the side-information into different regions with different confidence. Then the low-confident regions' side information could be corrected by the information obtained from the adjacent high-confident regions. At last, an adaptive block (AB) technique is implemented to improve performance on the base of the results from the content-based approach. Experiments illustrated that the average PSNR of side-information obtained by the content-based side-information approach with adaptive block is about 0.9dB higher the cases without it.

关键词： distributed video coding side-information content-based technique

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Extrapolating side information for low-delay pixel-domain distributed video coding

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9th International Workshop on Visual Content Processing and Representation

作者： Natario, Luis Brites, Catarina Ascenso, Joao Pereira, Fernando Univ Tecn Lisboa Inst Super Tecn Lisbon Portugal ISEL Lisbon Portugal

ISBN: (纸本)3540335781

distributed video coding (DVC) is a new video coding Approach based on the Wyner-Ziv theorem. Unlike most of the existing video codecs, each frame is encoded sepaxately (either as a key-frame or a Wyner-Ziv frame) which results in a simpler and lighter encoder since complex operations like motion estimation are not performed. The previously decoded frames are used at the decoder to estimate the Wyner-Ziv frames - the frames are coded independently but jointly decoded. To have a low-delay codec, the side information frames (estimation of the Wyner-Ziv frames to be decoded) must be extrapolated from past frames. This paper proposes a robust extrapolation module to generate the side information based on motion field smoothening to provide improved performance in the context of a low-delay pixel-domain DVC codec.

关键词： distributed video coding side information motion extrapolation low-delay

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Channel Noise and Correlation Noise of video Sequences in distributed video coding

Channel Noise and Correlation Noise of Video Sequences in Di...

引用

21st International Conference on Noise and Fluctuations (ICNF)

作者： Thambu, K. Fernando, X. N. Guan, L. Ryerson Univ Dept Elect & Comp Engn Toronto ON Canada

ISBN: (纸本)9781457701924

distributed video coding (DVC) is defined such as a correlated video sequence is transmitted via the distributed independent encoders, and it can be decoded conditionally at the decoder. In the DVC coding, if an encoder encodes the video frame X and the side information Y is at the decoder, where the side information is computed using the adjacent frames of the X known as key frames. The side information Y is considered as a prediction of X, and the correlation noise is defined as a residual error between the transmitted frame and the side information at the decoder. In this paper we analyze the behavior of the correlation noise N for different video sequences. We have analyzed the correlation of the adjacent frames or key frames in Foreman video sequence. This paper also discuss the difference between the channel noise and the correlation noise of the video sequences.

关键词： AWGN Correlation DVC coding Decoding Fading video coding Wireless communication channel noise correlation noise decoder distributed independent encoders distributed video coding image sequences video codecs video coding video sequences

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Block-Based distributed video coding Without Channel Codes 3

Block-Based Distributed Video Coding Without Channel Codes

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INTERNATIONAL CONFERENCE ON CONTROL ENGINEERING & INFORMATION TECHNOLOGY (CEIT)

作者： Manel, Benaissa Univ Constantine 1 Dept Elect SP Lab Constantine Algeria

ISBN: (纸本)9781479982134

distributed video coding (DVC) is a recent paradigm of video coding, based on distributed source coding and side information (SI) generated at the Decoder. Most of the DVC schemes are using complex channel codes such as LDPC or Turbo codes, which are increasing the decoder complexity and delay. Many searches have been done to simplfy the coding schemes, one of them was done by replacing the channel coding by a simple source coding. In this paper, we taken one of those DVC schemes which is based on block classification at the decoder combined with a new residual computing method based on modular arithmetic in conjunction with simple entropy coding. And, we propose to improve its performance by using a mode decision at the encoder side in addition to a parametric change in the residual computing method, with keeping the simplicity of source coding.

关键词： distributed video coding differential representation block classification Mode decision

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NEW INSIGHTS INTO IMPROVING COMPRESSION EFFICIENCY FOR distributed video coding

NEW INSIGHTS INTO IMPROVING COMPRESSION EFFICIENCY FOR DISTR...

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17th International Packet video Workshop

作者： Hua, Guogang Chen, Chang Wen Qualcomm Inc San Diego CA 92121 USA SUNY Buffalo Univ Buffalo Dept CSE Buffalo NY 14260 USA

ISBN: (纸本)9781424446513

In this paper, we investigate a fundamental issue in the distributed video coding (DVC) that, once resolved, would substantially improve the compression efficiency in DVC. This fundamental issue is the underlining relation between the distribution of the prediction errors and the compression efficiency of DVC. In the current approach to DVC, after the construction of prediction frame at decoder, the difference between the prediction and the current frames, or the prediction error, is inversely proportional to the correlation between these frames. Most existing approaches in DVC attempt to maximize such correlation, or to minimize the prediction error, in order to achieve the desired video compression efficiency. Recently, the research in DVC has reached a plateau in terms of its performance in coding efficiency. We believe one key solution to take DVC out of such performance plateau will be to design a better scheme to represent the correlation more effectively in DVC. In this research, we have worked out compelling theoretical analysis and proved that, in order to reduce the number of bits to be sent to decoder, the distribution of the prediction errors needs to be as concentrated as possible. From the practical point of view, we also show that the error control codes adopted for DVC will achieve higher efficiency when the distribution of prediction errors is more concentrated.

关键词： distributed video coding compression efficiency distribution of prediction errors

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distributed video coding Based on Advanced Side Information Generation Framework

Distributed Video Coding Based on Advanced Side Information ...

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2010 3rd IEEE International Conference on Computer Science and Information Technology—ICCSIT 2010

作者： Dong Liu,Minghui Du School of Electronic and Information Engineering South China University of Technology Guangzhou 510640,China

distributed video coding (DVC) is a new compression paradigm in video coding, which is receiving lots of interests nowadays. Side information creation is a key function in the DVC decoder, and plays a key-role in determining the performance of the codec. This paper proposes a novel framework to create side information at the block level with two modes: Wyner-Ziv mode and Intra/WZ mode, corresponding to Motion Compensated Frame Interpolation and motion compensated quality enhancement technique, respectively. While in the second mode, a low quality Intra block sent by the encoder is used to generate side information by doing motion estimation with the help of the reference frames. Experimental results demonstrate that the proposed scheme can achieve up to 2.1dB improvement in rate-distortion performance when compared to state-of-the-art DVC codec, especially for high motion video sequences and long group of pictures sizes.

关键词： distributed video coding side information creation intra coding mode motion compensated frame interpolation quality enhancement

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Improving side information generation using dynamic motion estimation for distributed video coding

Improving side information generation using dynamic motion e...

引用

Conference on Visual Information Processing and Communication III

作者： Park, Insu Capson, David McMaster Univ Sch Comp Engn & Sci Hamilton ON Canada McMaster Univ Dept Elect & Comp Engn Hamilton ON L8S 4L8 Canada

ISBN: (纸本)9780819489524

A new side information generation algorithm using dynamic motion estimation and post processing is proposed for improved distributed video coding. Multiple reference frames are employed for motion estimation at the side information frame generation block of the decoder. After motion estimation and compensation, post processing is applied to improve the hole and overlapped areas on the reconstructed side information frame. The proposed side information method contributes to improve the quality of reconstructed frames at the distributed video decoder. The average encoding time of the distributed video coding is around 15% of H.264 inter coding and 40% of H.264 intra coding. The proposed side information based distributed video coding demonstrates improved performance compared with that of H.264 intra coding.

关键词： distributed video coding side information generation motion estimation multiple reference frames

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LOCAL ADAPTIVE LEARNING AND FUSION FOR SIDE INFORMATION INTERPOLATION IN distributed video coding

LOCAL ADAPTIVE LEARNING AND FUSION FOR SIDE INFORMATION INTE...

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Picture coding Symposium 2009

作者： Liu, Xianming Zhang, Yongbing Li, Yongpeng Liu, Hongbin Ma, Siwei Zhao, Debin Harbin Inst Technol Dept Comp Sci & Technol Harbin 150001 Peoples R China Chinese Acad Sci Grad Univ Beijing 100039 Peoples R China Peking Univ Inst Digital Media Beijing 100871 Peoples R China

ISBN: (纸本)9781424445936

Motivated by theoretical analysis Of the Curve fitting problem based on equivalent kernel, in this paper we propose a local adaptive learning and fusion model for side information interpolation in distributed video coding. In the proposed model, each pixel in the interpolated frame is approximated as the linear combination of samples within a local spatio-temporal window using kernel parameters as weight. The size of training window can be adaptive to the motion characteristic of video, from samples in which the kernel parameters can be locally learned. In order to further improve the quality of interpolated frames, we introduce a belief-projection based fusion strategy with adaptive weights for multiple interpolated results which are with the same time index. Experimental results demonstrate that the proposed learning and fusion model is effective in performance for side information interpolation in distributed video coding.

关键词： Side information interpolation distributed video coding equivalent kernel spatio-temporal local adaptive learning fusion

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Review of distributed video coding 13

Review of Distributed Video Coding

引用

2017 13th IEEE International Conference on Electronic Measurement & Instruments (ICEMI)

作者： Shang Fei Ye Juanjuan College of Mechanical Engineering Nanjing University of Science and Technology

ISBN: (纸本)9781509050369;9781509050352

distributed video coding is a new video coding mode, and it can shift the computational complexity from encoder to decoder. That makes it very suitable for wireless video terminals with limited computing capabilities, memory and power. This technology is rapidly developing with emerging video applications such as wireless video surveillance, wireless digital camera and mobile video telephony. This paper summarizes the distributed video coding technology from the theory to the application from the perspective of basic principle, coding framework, key technology and development trend. On the basis of these, this paper proposes several aspects of distributed video coding that is worthy of further study.

关键词： distributed video coding video coding technology side information relevant noise model

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distributed video coding Based on Multiple Description

Distributed Video Coding Based on Multiple Description

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The Fifth International Conference on Information Assurance and Security(第五届信息保障与安全国际会议)

作者： Hongxia Ma Yao Zhao Chunyu Lin Anhong Wang Institute of Information Science Beijing Jiaotong UniversityBeijing 100044China

ISBN: (纸本)9780769537443

In our paper, we propose a novel distributed video coding (DVC) scheme using the theory of multiple description (MD), in which key frame is encoded by MD codec and transmitted over the corresponding channel. This scheme combines the advantage of DVC as well as robustness of MD, and exploits three different methods to generate multiple descriptions for the key frames that are essential to side information. Experiments demonstrate that it can get better performance than some general DVC methods. Besides, it demonstrates higher robustness in packet-loss channel than general DVC due to the MD algorithm.

关键词： distributed video coding multiple description robustness

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