检索结果-内蒙古大学图书馆

Low-complexity unbalanced multiple description coding based on balanced clusters for adaptive peer-to-peer video streaming

引用

SIGNAL PROCESSING-IMAGE COMMUNICATION 2011年第3期26卷 143-161页

作者： Ardestani, Majid R. Shirazi, Ali Asghar Beheshti Hashemi, Mahmoud Reza Iran Univ Sci & Technol Image Proc Lab Sch Elect Engn Tehran Iran Univ Tehran Multimedia Proc Lab Sch Elect & Comp Engn Tehran Iran

multiple description scalable coding based on T+2D wavelet decomposition structure is highly flexible for peer-to-peer (P2P) video streaming. Finding the optimal truncation point of each wavelet-decomposed code block (CB) within each description is an NP-hard problem (Akyol et al., 2007 [1]). For P2P video streaming, it is necessary to implement an efficient multiple description encoder with three attributes: "adaptive" (due to the time-varying capacity of the P2P network links and nodes), "low-complexity" (because of the low processing power of the receiving peer) with arbitrarily "unbalanced descriptions" (because of the unequal capacities of the different sending peers). To design a multiple description encoder with the above mentioned features, we propose a simple clustering algorithm for partitioning the CBs into a limited number of clusters. This simple and efficient clustering algorithm significantly reduces the size of redundancy-rate assignment matrix, such that one can find the optimal channel-aware cluster-level redundancy-rate assignment matrix using a low-complexity full search approach. This approach improves the decoding quality compared to the co-echelon adaptive frameworks (Akyol et al., 2007 [1];Tillo et al.. 2007 [8]) in which a non-optimal heuristic rate assignment pattern is used. Especially for the unbalanced P2P scenario (which is the usual case), the performance gain of the proposed approach over the one presented in Tillo et al. (2007) 181 (generating only balanced descriptions) is significant (0.95-3.0 dB). In addition, the proposed clustering approach may be analytically represented by closed-form relations for low-complexity computation of the optimal encoding parameters. Our complexity analysis shows that the proposed approach requires 52-96% less computations compared to the framework in Akyol et al. (2007) [1]. Therefore, an efficient real-time post-encoding adaptation mechanism may be realized. The simulation results demonstrate that

关键词： Scalable video coding multiple description coding Motion compensated temporal filtering Channel-aware redundancy-rate allocation Clustering

来源：评论

学校读者我要写书评

暂无评论

Flexible Adaptive multiple description coding for Video Transmission

引用

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 2012年第1期22卷 1-11页

作者： Kamnoonwatana, Nawat Agrafiotis, Dimitris Canagarajah, C. Nishan Univ Bristol Dept Elect & Elect Engn Bristol BS8 1UB Avon England

A channel adaptive multiple description video codec is presented with flexible redundancy allocation based on modeling and minimization of the end-to-end distortion. We employ a three-loop multiple description coding scheme for which we develop models that estimate the rate-distortion performance of the side encoders as well as the overall end-to-end distortion given channel statistics. A simple yet effective algorithm is formulated for determining appropriate levels of redundancy given a total bit rate and channel estimates in the form of packet error rates. The experimental results presented validate the proposed models over various channels conditions. The performance and adaptivity of the codec is evaluated through extensive simulations with a 2 x 2 wireless multiple input multiple output system. A gain of more than 10 dB can be achieved compared to a non-adaptive system and even larger gains can be had relative to typical single description transmissions.

关键词： MIMO systems multiple description coding rate allocation source-channel video coding

来源：评论

学校读者我要写书评

暂无评论

Balanced Multifilter Banks for multiple description coding

引用

IEEE TRANSACTIONS ON IMAGE PROCESSING 2011年第3期20卷 866-872页

作者： Li, Baobin Peng, Lizhong Chinese Acad Sci Grad Univ Sch Informat Sci & Engn Beijing 100871 Peoples R China Peking Univ Sch Math Sci LMAM Beijing 100871 Peoples R China

The parametrization for one kind of multifilter banks generating balanced multiwavelets is presented in this paper, in which two low-pass filters are flipping filters, and two highpass filters have linear phase. Based on these parametric expressions, some balanced multiwavelets and analysis-ready multiwavelets are constructed, which are symmetric, or antisymmetric. Moreover, on the basis of balanced multiwavelet transform, a new method of multiple description coding is given, and experiments show that this method works well. Compared with the traditional multiple description coding method, this method has low redundancy.

关键词： Balanced multifilter bank multiple description coding parametrization

来源：评论

学校读者我要写书评

暂无评论

A Flexible multiple description coding Framework for Adaptive Peer-to-Peer Video Streaming

引用

IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING 2007年第2期1卷 231-245页

作者： Akyol, Emrah Tekalp, A. Murat Civanlar, M. Reha Univ Calif Los Angeles Henry Samuel Sch Engn & Appl Sci Dept Elect Engn Los Angeles CA 90095 USA Koc Univ Coll Engn Dept Elect & Comp Engn TR-34450 Istanbul Turkey DoCoMo USA Labs Palo Alto CA 94304 USA

Efficient peer-to-peer (P2P) video streaming is a challenging task due to time-varying nature of both the number of available peers and network/channel conditions. This paper proposes a novel adaptive P2P video streaming system, which features: i) a new flexible multiple-description coding (F-MDC) framework, such that the number of base and enhancement descriptions, and the rate and redundancy level of each description can be adapted on the fly (by only post-processing of the encoded bitstream), and ii) a new adaptive TCP-friendly rate-controlled (TFRC), on-demand, many-to-one P2P video streaming solution based on the proposed F-MDC framework. We extend the highly scalable video coder [17], [18] to MDC within the proposed F-MDC framework. Optimization of the design parameters of the proposed F-MDC method is discussed within the context of the proposed adaptive P2P streaming solution, where the number and quality of available streaming peers/paths are a priori unknown and vary in time. Experimental results, by means of NS-2 network simulation of a P2P video streaming system, show that adaptation of the number, type of descriptions and the rate and redundancy level of each description according to network conditions yields significantly superior performance when compared to other scalable MDC schemes using a fixed number of descriptions/layers with fixed rate and redundancy level.

关键词： Adaptive P2P streaming multiple description coding rate-distortion optimization scalable video coding TCP-friendly rate-controlled (TFRC)

来源：评论

学校读者我要写书评

暂无评论

On the Compound Broadcast Channel: multiple description coding and Interference Decoding

引用

IEEE TRANSACTIONS ON INFORMATION THEORY 2020年第1期66卷 38-64页

作者： Benammar, Meryem Piantanida, Pablo Shamai, Shlomo Cent Supelec Dept Telecommun F-91190 Gif Sur Yvette France Inst Super Aeronaut & Espace ISAE Supaero Dept Elect Optron & Signal Proc F-31055 Toulouse France Univ Paris Sud French Natl Ctr Sci Res CNRS Cent Supelec F-91192 Gif Sur Yvette France Univ Montreal Montreal Inst Learning Algorithms Mila Montreal PQ H3T 1N8 Canada Technion Israel Inst Technol Dept Elect Engn IL-3200003 Haifa Israel

This work investigates the general two-user compound Broadcast Channel (BC) in which an encoder wishes to transmit two private messages W-1 and W-2 to two receivers while being oblivious to the actual channel realizations controlling the communication. The focus is on the characterization of the largest achievable rate region by resorting to more involved encoding and decoding techniques than the usual coding schemes of the standard BC. Involved decoding schemes are first explored, and an achievable rate region is derived based on the principle of Interference Decoding (ID), in which each receiver decodes its intended message and chooses to (non-uniquely) decode, or not, the interfering non-itended message. This decoding scheme is shown to be capacity achieving for a class of non-trivial compound BEC/BSC broadcast channels while the worst-case of Marton's inner bound-based on No Interference Decoding (NID)-fails to achieve the capacity region. Involved encoding schemes are later investigated, and an achievable rate region is derived based on multiple description (MD) coding wherin the encoder transmits a common description as well as multiple dedicated private descriptions to the many possible channel realizations of the users. It turns out that MD coding yields larger inner bounds than the single description scheme-Common description (CD) coding-for a class of compound multiple Input Single Output Broadcast Channels (MISO BC).

关键词： Encoding Interference Compounds Decoding MISO communication Uncertainty Receivers Channel capacity channel state information broadcast channels (BCs) compound channels multiple description coding multiple input single output broadcast channel (MISO BC)

来源：评论

学校读者我要写书评

暂无评论

On the optimality of block orthogonal transforms for multiple description coding of Gaussian vector sources

引用

IEEE SIGNAL PROCESSING LETTERS 2000年第4期7卷 76-78页

作者： Pradhan, SS Ramchandran, K Univ Calif Berkeley Dept Elect Engn & Comp Sci Berkeley CA 94720 USA

In this work, we consider the application of unitary filter-banks for multiple description coding of independent, identically distributed Gaussian vector sources, We derive the redundancy-rate-distortion bound for this class of signals. It is shown that for two-dimensional (2-D) Gaussian vector sources (resulting in a two-description system), 2 x 2 block transforms give all the achievable optimal points in the redundancy-rate-distortion function among the class of all unitary filter banks. similar results can be obtained for higher-dimensional transforms.

关键词： diversity linear estimation multiple description coding unitary filter-banks

来源：评论

学校读者我要写书评

暂无评论

Robust Parametric Audio coding Using multiple description coding

引用

IEEE SIGNAL PROCESSING LETTERS 2009年第12期16卷 1083-1086页

作者： Jensen, Jesper Rindom Christensen, Mads Graesboll Jensen, Morten Holm Jensen, Soren Holdt Larsen, Torben Univ Aalborg Dept Elect Syst DK-9220 Aalborg Denmark Widex AS DK-3500 Vaerloese Denmark

We propose a new multiple description spherical quantization with repetitively coded amplitudes (MDSQRA) scheme suited for quantization of sinusoidal parameters. The quantization scheme is constituted by a set of spherical quantizers inspired by the multiple description spherical trellis-coded quantization (MDSTCQ) scheme. In this scheme, we apply repetitive coding on the amplitudes, while multiple description coding are applied on the phases and frequencies. Thereby, MDSQRA becomes directly implementable, as opposed to MDSTCQ, since the phase and frequency quantizers depend on the amplitudes which have dissimilar descriptions in MDSTCQ. Furthermore, we implement MDSQRA into a perceptual matching pursuit based sinusoidal audio coder. Finally, we evaluate MDSQRA through perceptual distortion measurements and MUSHRA listening tests. The tests show that MDSQRA outperforms MDSTCQ with respect to a expected perceptual distortion measure. The same results are obtained through the MUSHRA tests performed on sound clips coded using MDSQRA and MDSTCQ.

关键词： multiple description coding perceptual audio coding pre- and post-filtering sinusoidal parametric coding spherical quantization

来源：评论

学校读者我要写书评

暂无评论

Hybrid multiple description coding Based on H.264

引用

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 2010年第1期20卷 76-87页

作者： Hsiao, Chia-Wei Tsai, Wen-Jiin Alpha Image Technol Corp Jubei City 302 Hsinchu Taiwan Natl Chiao Tung Univ Dept Comp Sci Hsinchu 300 Taiwan

multiple description (MD) video coding is one of the approaches that can be used to reduce the detrimental effects caused by transmission over error-prone networks. A number of approaches have been proposed for MD coding, where each provides a different tradeoff between compression efficiency and error resilience. This paper first presents two basic MD coding methods;one segments the video in the spatial domain, while the other in the frequency domain. Then a hybrid MD coding method is proposed. The hybrid MD encoder segments the video in both the spatial and frequency domains. In the case of data loss, the hybrid MD decoder takes advantage of the residual-pixel correlations in the spatial domain, and the coefficient correlations in the frequency domain, for error concealment. As a result, better error resilience can be achieved at high compression efficiency. The advantages of the proposed hybrid MD method are demonstrated in the contexts of descriptor loss in ideal channels and in packet-loss networks.

关键词： Frequency segmentation multiple description coding spatial segmentation

来源：评论

学校读者我要写书评

暂无评论

Region-Based multiple description coding for Multiview Video Plus Depth Video

引用

IEEE TRANSACTIONS ON MULTIMEDIA 2018年第5期20卷 1209-1223页

作者： Lin, Chunyu Zhao, Yao Xiao, Jimin Tillo, Tammam Beijing Jiaotong Univ Inst Informat Sci Beijing Key Lab Adv Informat Sci & Network Beijing 100044 Peoples R China Xian Jiaotong Liverpool Univ Suzhou 215123 Peoples R China Libera Univ Bolzano Bozen Unibz I-39100 Bolzano Italy

Interframe and interview predictions are widely employed in multiview video coding. This technique improves the coding efficiency, but it also increases the vulnerability of the coded bitstream. Thus, one packet loss will affect many subsequent frames in the same view and probably in other referenced views. To address this problem, a region-based multiple description coding scheme is proposed for robust 3-D video communication in this paper, in which two descriptions are formed by setting the left and right view as dominant in the first and second description, respectively. This approach exploits the fact that most regions in the reference view could be synthesized from the base view. Hence, these regions could be skipped or only coarsely encoded. In our work, the disoccluded regions, illumination-affected regions, and remaining regions are first determined and extracted. By assigning different quantization parameters for these three different regions according to the network status, an efficient multiple description scheme is formed. Experimental results demonstrate that the proposed scheme achieves considerably better performance compared with the traditional approach.

关键词： multiple description coding multiview video plus depth video coding

来源：评论

学校读者我要写书评

暂无评论

Multicast virtual network mapping for supporting multiple description coding-based video applications

引用

COMPUTER NETWORKS 2013年第4期57卷 990-1002页

作者： Miao, Yuting Yang, Qiang Wu, Chunming Jiang, Ming Chen, Jinzhou Zhejiang Univ Coll Comp Sci & Technol Hangzhou 310003 Zhejiang Peoples R China Zhejiang Univ Coll Elect Engn Hangzhou 310003 Zhejiang Peoples R China Hangzhou Dianzi Univ Coll Comp Sci Hangzhou Zhejiang Peoples R China

Video applications have gradually become one of the mainstreams of Internet traffic along with the technological advances in recent years. In parallel, network virtualization technique allows Internet Service Providers (ISPs) to be decoupled from the physical network infrastructure operators to provide various video services to customers through tailored Virtual Networks (VNs). In a video multicast VN, the ISP could appropriately determine and configure the virtual nodes and links to deliver customized video service to the affiliated end users. However, available multicast tree mapping algorithms are based on the strong assumption that the locations of source and a collection of destination nodes are known a priori. Also, they have not taken any intermediate nodes between source and destinations into the VN mapping request. These assumptions greatly limit the adoption of advanced video coding techniques. In this paper, the multicast networks mapping for enabling multiple description coding (MDC) based video applications is explored. A novel multicast mapping algorithm, MMPC, is proposed based on path convergence to flexibly identify and configure nodes (with automatic intermediate nodes identification) in multicast trees to meet certain criteria. The suggested approach is described in details and its key characteristics are analyzed through a set of analytical proves. Extensive simulation experiments are carried out to assess its performance (e.g. acceptance ratio, mapping cost and mapping time) against a range of multicast VN request scenarios. The simulation results demonstrate the superiority of MMPC algorithm in terms of multicast mapping efficiency and cost by using the conventional two-phase VN mapping algorithm as a comparison benchmark. (C) 2012 Elsevier B.V. All rights reserved.

关键词： multiple description coding Multicast tree Virtual network mapping Path convergence

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：