检索结果-内蒙古大学图书馆

2009 2nd IEEE International Conference on Broadband Network & Multimedia Technology（IC-BNMT2009）

作者： Zhang Youwei 1,2,Wu Chanle 1 1.National Engineering Research Center for Multimedia Software,WuHan University,WuHan 2.School of Computer,Yangtze University,JingZhou

Nowadays,many application layer multicast protocols (ALM) in which multiple description coding (MDC) is introduced have been proved to be more scalable and stable than traditional multicast protocols in practical *** this paper,we propose an ALM system called SMSD based on synchronized MDC for streaming media to address the synchronization of available *** focuses on the video quality,firstly hosts can join the different overlay trees in different layers simultaneously,then the maximum covering set is worked out based on acquired descriptions information to achieve the best video quality,the quality management module with much low overhead is responsible for monitoring the variation of cached content due to departure of parents and activating the re-join *** implemented on Internet-like topology indicate that SMSD achieves higher video quality,lower control traffic than traditional ALM protocols,and comparable latency,link stress and robustness are achieved as well.

关键词： application layer multicast overlay tree streaming media synchronization video quality multiple description coding

来源：评论

学校读者我要写书评

暂无评论

Balanced multiple description video coding using optimal partitioning of the DCT coefficients

引用

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 2005年第7期15卷 928-934页

作者： Matty, KR Kondi, LP SUNY Buffalo Univ Buffalo Dept Elect Engn Buffalo NY 14260 USA

In this paper, we propose a balanced multiple description video coding scheme which is based on the partitioning of the discrete cosine transform (DCT) coefficients. Our scheme splits the single-layered stream generated by a standard coder into two correlated and balanced (virtually identical rates and distortions) substreams. The optimization is in the redundancy-rate-distortion sense using Lagrangian relaxation for optimum allocation of redundancy among the blocks in the frame. A greedy algorithm to meet the equal distortions criterion and an algorithm to optimally achieve equal bit rates for the two descriptions are proposed. Our simulation results substantiate our claim of achieving balanced descriptions at high peak signal-to-noise ratios values for any specified redundancy and any target bit rate. Our design complies with the existing motion-compensated DCT-based standards, i.e., each description can be independently decoded by any standard decoder.

关键词： greedy algorithm H.263 multiple description coding partitioning algorithm rate distortion-theory video coding

来源：评论

学校读者我要写书评

暂无评论

Two-description Image coding With Steganography

引用

IEEE SIGNAL PROCESSING LETTERS 2008年第1期15卷 887-890页

作者： Zhang, Zhiyuan Zhu, Ce Zhao, Yao Beijing Jiaotong Univ Inst Informat Sci Beijing 100044 Peoples R China Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

For two-description image coding, a conventional scheme is to partition an image into two parts and then to produce each description by alternatively concatenating a finely coded bitstream of one part and a coarsely coded bitstream of the other part. This letter presents a new two-description image coding approach using steganography. Specifically, we propose forming each description by embedding (hiding) the coarsely coded part into the finely coded part based on a least-significant bit (LSB) steganographic method. In this way, the bit budget for the coarsely coded part in each description can be saved with little reconstruction degradation for the finely coded part if the embedding process is well designed. The experimental results substantiate the effectiveness of the proposed method.

关键词： Data embedding image coding multiple description coding steganography

来源：评论

学校读者我要写书评

暂无评论

multiple description video coding based on balanced multiwavelet image transformation

Multiple description video coding based on balanced multiwav...

引用

Conference on Internet Imaging VI

作者： Liu, W Ma, ZM Tan, XJ Zhongshan Univ Dept Elect Informat Proc Lab Guangzhou 510275 Peoples R China

ISBN: (纸本)0819456438

A new MD (multiple description) video coding method, which is based on balanced multiwavelet image transformations, is proposed here. First, we apply balanced multiwavelet transformation to the image;then, corresponding components of each sub-band are gathered together, so that we can decompose the image into 4 MDs. By treating every frame of the video sequences like this, we can get a theme of MD video coding. A practical MD coding theme must satisfy two requirements. First, each description should carry the same amount of information. Secondly, there must be dependence between each description. Among commonly used multiwavelets, we find that only balanced multiwavelets can satisfy these two requirements. Furthermore, based on the feature of CARDBAL2 multiwavelet and strict mathematical deductions, we also find a way to estimate the lost descriptions. The experimental results presented in this paper show that, even when 75% of the data of the image are lost, we could still get a good-quality recovered image, with a PSNR value of nearly 30dB.

关键词： multiwavelet transformation multiple description coding network transmission

来源：评论

学校读者我要写书评

暂无评论

A novel multiple description scalable coding scheme for mobile wireless video transmission

A novel multiple description scalable coding scheme for mobi...

引用

Conference on Multimedia on Mobile Devices

作者： Zheng, HF Yu, L Chen, CW Fuzhou Univ Coll Informat Technol Fujian 350002 Peoples R China

ISBN: (纸本)0819456578

We proposed in this paper a novel multiple description scalable coding (MDSC) scheme based on in-band motion compensation temporal filtering (IBMCTF) technique in order to achieve high video coding performance and robust video transmission. The input video sequence is first split into equal-sized groups of frames (GOFs). Within a GOF, each frame is hierarchically decomposed by discrete wavelet transform. Since there is a direct relationship between wavelet coefficients and what they represent in the image content after wavelet decomposition, we are able to reorganize the spatial orientation trees to generate multiple bit-streams and employed SPIHT algorithm to achieve high coding efficiency. We have shown that multiple bit-stream transmission is very effective in combating error propagation in both Internet video streaming and mobile wireless video. Furthermore, we adopt the IBMCTF scheme to remove the redundancy for inter-frames along the temporal direction using motion compensated temporal filtering, thus high coding performance and flexible scalability can be provided in this scheme. In order to make compressed video resilient to channel error and to guarantee robust video transmission over mobile wireless channels, we add redundancy to each bit-stream and apply error concealment strategy for lost motion vectors. Unlike traditional multiple description schemes, the integration of these techniques enable us to generate more than two bit-streams that may be more appropriate for multiple antenna transmission of compressed video. Simulate results on standard video sequences have shown that the proposed scheme provides flexible tradeoff between coding efficiency and error resilience.

关键词： multiple description coding scalable coding motion-compensated temporal filtering error resilience error concealment mobile wireless channel

来源：评论

学校读者我要写书评

暂无评论

Cooperative media data streaming with scalable video coding

引用

IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING 2008年第9期20卷 1273-1281页

作者： Guo, Hui Lo, Kwok-Tung China Univ Petr Dept Comp Sci & Technol Beijing 102200 Peoples R China Hong Kong Polytech Univ Elect & Informat Engn Dept Kowloon Hong Kong Peoples R China

Peer-to-peer (P2P) streaming has become a promising approach for disseminating streaming media content from the server to a large number of interested clients. It still faces many challenges, however, such as high churn rate of peer clients, uplink bandwidth constraints of participating peers, and heterogeneity of client capacities. To resolve these issues, this paper presents a new P2P streaming framework that combines with the advantages of both mesh-based multisource overlay networks and scalable video coding techniques, specifically with multiple description coding (MDC), to improve the streaming quality of participating clients. In this paper, an optimized allocation policy (OAP) algorithm was proposed for multidescriptions allocation. Extensive simulations show that the proposed system achieves higher quality of service by peer-assisted cooperative streaming and MDC coding. In addition, we investigate an efficient cooperative caching mechanism for streaming service. The target is to provide low-latency and high-quality services by virtue of peer collaboration. The storage and replacement of caching content are based on a segment-based strategy. Through comparison, we demonstrate the effectiveness of the proposed scheme and compare with the traditional LRUF scheme through extensive experiments over large Internet-like topologies. Results show that the system outperforms some previous schemes in resource utilization and is more robust and resilient to node departure, which demonstrate that it is well suited for quality adaptive cooperative streaming applications.

关键词： P2P overlay network multiple description coding media streaming multimedia communication cooperative cache

来源：评论

学校读者我要写书评

暂无评论

multiple description wavelet-based image coding using correlating transforms

引用

AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 2007年第6期61卷 411-417页

作者： Khelil, Khaled Bekka, Rais El Hadi Djebari, Ali Rouvaen, Jean M. Univ Djillali Liabes Sidi Bel Abbes Lab LTTNS Sidi Bel Abbes 22000 Algeria Univ Ferhat Abbes Dept Elect Setif 19000 Algeria Univ Valenciennes Mont Houy CNRS IEMN Dept OAEUMR 8520 F-59313 Valenciennes France

The objective of multiple description coding (MDC) is to represent a source into multiple descriptions such that various reconstruction qualities are obtained from different subsets of the descriptions. In this paper, we propose a simple scheme that combines the multiple descriptions transform coding (MDTC) method with the discrete wavelet transform (DWT). We compare the performance of the proposed scheme with a discrete cosine transform (DCT)-based scheme prevalent in other papers. Simulation results show that our proposed DWT technique outperforms both objectively and subjectively the method based on DCT in the case of packet loss. (C) 2006 Elsevier GmbH. All rights reserved.

关键词： joint source channel coding multiple description coding discrete wavelet transform (DWT) image coding

来源：评论

学校读者我要写书评

暂无评论

Adaptive FEC-based packet loss resilience scheme for supporting voice communication over ad hoc wireless networks

引用

IEEE TRANSACTIONS ON MOBILE COMPUTING 2008年第10期7卷 1184-1199页

作者： Gandikota, Venkat Raju Tamma, Bheemarjun Reddy Murthy, C. Siva Ram Yahoo Software Dev India Pvt Ltd Bangalore 560001 Karnataka India Indian Inst Technol Dept Comp Sci & Engn Madras 600036 Tamil Nadu India Univ Calif San Diego Jacobs Sch Engn La Jolla CA 92093 USA

Providing real-time voice support over multihop ad hoc wireless networks (AWNS) is a challenging task. The standard retransmission-based strategies proposed in the literature are poorly matched to voice applications because of timeliness and large overheads involved in transmitting small-sized voice packets. To make a voice application feasible over AWNS, the perceived voice quality must be improved while not significantly increasing the packet overhead. We suggest packet-level media-dependent adaptive forward error correction (FEC) at the application layer in tandem with multipath transport for improving the voice quality. Since adaptive FEC masks packet losses in the network, at the medium access control (MAC) layer, we avoid retransmissions (hence, no acknowledgments) in order to reduce the control overhead and end-to-end delay. Further, we exploit the combined strengths of layered coding and multiple description (MD) coding for supporting error-resilient voice communication in AWNS. We propose an efficient packetization scheme in which the important substream of the voice stream is protected adaptively with FEC depending on the loss rate present in the network and is transmitted over two maximally node-disjoint paths. The less important substream of the voice stream is encoded into two descriptions, which are then transmitted over two maximally node-disjoint paths. The performance of our scheme (packet-level media-dependent adaptive FEC scheme) is evaluated in terms of two parameters: residual packet loss rate (RPLR, packet loss rate after FEC recovery) and average burst length (ABL, average length of consecutive packet losses after FEC recovery) of voice data after FEC recovery. The sets of equations leading to the analytical formulation of both RPLR and ABL are first given for a renewal error process. The values of both these parameters depend on FEC-Offset (r, the distance between original voice frame and piggybacked redundant voice frame) and loss rate prese

关键词： ad hoc networks voice frame layered coding multiple description coding forward error correction packetization scheme voice quality multipath transport multimedia

来源：评论

学校读者我要写书评

暂无评论

Algorithms for Server Placement in multiple-description-Based Media Streaming

引用

IEEE TRANSACTIONS ON MULTIMEDIA 2008年第7期10卷 1382-1392页

作者： Ahuja, Satyajeet Krunz, Marwan Univ Arizona Dept Elect & Comp Engn Tucson AZ 85721 USA

multiple description coding (MDC) has emerged as a powerful technique for reliable real-time communications over lossy packet networks. In its basic form, it involves encoding a media stream into r substreams that are sent independently from a source to a destination. Each substream (or description) can be decoded independent of the other r - 1 substreams. With every successful reception of a substream, the quality of the decoded signal improves. In this paper, we consider the problem of placing a set of servers in the network such that a desired quality of service can be provided to a community of clients that request MDC-coded traffic. We formulate the server placement (SP) problem, with the goal of identifying the minimum number of server locations that can provide r descriptions to a set of clients such that the delay associated with each path from a chosen server location to a given client is bounded by a given delay constraint and the total "unreliability" associated with the group of paths to a given client is also upper bounded. We show that the SP problem belongs to the class of NP-complete problems. We propose a mixed-integer linear programming (MILP) formulation and an efficient heuristic solution for the SP problem. Simulations are conducted to evaluate the performance of the proposed algorithm and compare it with the optimal solution provided by the MILP solution.

关键词： multiple description coding path diversity

来源：评论

学校读者我要写书评

暂无评论

A content-centric framework for effective data dissemination in opportunistic networks

引用

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2008年第5期26卷 761-772页

作者： Chen, Ling-Jyh Yu, Chen-Hung Tseng, Cheng-Long Chu, Hao-hua Chou, Cheng-Fu Acad Sinica Inst Informat Sci Taipei Taiwan Natl Taiwan Univ Dept Comp Sci & Informat Engn Taipei 10764 Taiwan Natl Taiwan Univ Grad Inst Networking & Multimedia Taipei Taiwan

In this paper, we address the challenges of content transfer in opportunistic networks, and propose techniques to better facilitate data dissemination based on the characteristics of the content. To investigate this problem from its origins, we propose three message scheduling algorithms: Sequential Forwarding (SF), Full Interleaving (FI), and Block-based Interleaving (III). Each algorithm is embedded in a specially tailored data dissemination technique to evaluate the benefits of applying it to different types of content and data dissemination methods. Three types of content (file, video and web) are considered and evaluated, and the dissemination methods considered are Layered multiple description coding (LMDC) based and file-based. Using simulations as well as both synthetic and realistic network scenarios, we evaluate the proposed schemes in terms of latency and user perceived quality, and demonstrate how the schemes can achieve much better latency performance for file transfers. Furthermore, we show that using LMDC-based techniques leads to higher user perceived quality, since the end user is allowed to "preview" video file or web content, even before the data has been completely transferred. The effectiveness and robustness of our message scheduling algorithms and their corresponding content dissemination techniques make them ideal solutions that can go a long way toward effective data dissemination in opportunistic networks.

关键词： opportunistic networks delay/disruption tolerant networks routing multiple description coding layered coding

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

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

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：