检索结果-内蒙古大学图书馆

International Conference on Information Science and Applications (ICISA)

作者： Yoonjeong Shin Namrye Son Nguyen Dinh Toan Gueesang Lee Department of Computer Engineering Gwangju University Gwangju South Korea Primary Research Center Mokpo National University Muan South Korea School of Electronics and Computer Engineering Chonnam National University Gwangju South Korea

ISBN: (纸本)9781424459421

The recently developed video compression standard, H.264/AVC surpasses the performance of previous video standards, such as MPEG-2, MPEG-4(part2), and H.263 and is therefore expected to be selected as the video standard for most digital video applications. The widely distributed infrastructure, however, continues to use the previous standards. Heterogeneous video transcoding offers a significant key to the resolution of this problem. This paper suggests a new algorithm for H.264/AVC to MPEG-2 transcoding that uses motion vector clustering to reduce the computation time with no loss of quality. Such a clustering method can reduce the number of candidate motion vectors that are gathered during the H.264 decoding stage. These candidate motion vectors consider the correlation between the direction and distance of the motion vectors in the variable blocks in H.264/AVC. The candidate motion vector that has the least distortion is then selected in the MPEG-2 encoder. The MPEG-2 encoder can therefore use the best motion vector without carrying out computations for motion estimation. The experimental results show that the proposed method can maintain a good level of video quality while reducing the computational complexity by a considerable 64%, on average, compared to a cascade transcoder.

关键词： transcoding Video compression Standards development Automatic voltage control Transform coding Clustering algorithms Clustering methods Decoding Motion estimation Computational complexity

来源：评论

学校读者我要写书评

暂无评论

Storisphere: From TV Watching to Community Story Telling

引用

IEEE COMMUNICATIONS MAGAZINE 2013年第8期51卷 112-119页

作者： Mu, Mu Simpson, Steven Bojko, Craig Broadbent, Matthew Brown, James Mauthe, Andreas Race, Nicholas Hutchison, David Univ Lancaster Lancaster LA1 4YW England

Conventional television services have been increasingly challenged by the more interactive and user-centric video sharing applications. With the growing popularity of social networks and video services, users are becoming the editors and broadcasters of their own stories. User-generated video content, which provides unique perspectives from individuals, is likely to be the new medium to complement professional broadcast TV for story sharing, especially in user communities of specific interest. We have developed Storisphere to provide a web-based collaborative video content workspace for members of a community to compose and share video stories, using desktop or mobile devices. Storisphere is currently being evaluated for video storytelling by various user communities.

关键词： Media Streaming media TV Communities transcoding Servers Interactive systems

来源：评论

学校读者我要写书评

暂无评论

Temporal scalable mobile video communications based on an improved WZ-to-SVC transcoder

引用

EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING 2013年第1期2013卷 1-10页

作者： Corrales-Garcia, Alberto Luis Martinez, Jose Fernandez-Escribano, Gerardo Jose Quiles, Francisco Univ Castilla La Mancha Inst Invest Informat Albacete Albacete 02071 Spain

Wyner-Ziv (WZ) to scalable video coding (SVC) transcoding can offer a suitable framework to support scalable video communications between low-cost devices. In addition, the video delivery provided by SVC covers the needs of a wide range of homogeneous networks and different devices. Despite the advantages of the video transcoding framework, the transcoder accumulates high complexity and it must be reduced in order to avoid excessive delays in communication. In this article, an approach for WZ to SVC transcoding is presented. The information generated during the first stage is reused during the second one, and as a consequence the time taken by the transcoding is reduced by around 77.77%, with a negligible rate-distortion penalty.

关键词： transcoding Scalable video coding Wyner-Ziv coding Temporal scalability

来源：评论

学校读者我要写书评

暂无评论

Process variation aware transcoding for low power H.264 decoding

Process variation aware transcoding for low power H.264 deco...

引用

Embedded Systems for Real-Time Multimedia (ESTIMedia)

作者： Kiarash Amiri Amin Khajeh Ahmed M. Eltawil Fadi J. Kurdahi Department of Electrical Engineering and Computer Science University of California Irvine CA USA

transcoding is commonly used in media servers to adapt video bitstreams to capabilities and specifications of the receiving playback devices or the transmission network channel in between. Primary adjustments are done on the video format, the resolution and the bitrate. In this paper we propose utilizing transcoding as a means of converting a regular standard video bitstream to a standard video bitstream that is also aware of power-reliability characteristics of the target decoder device with main focus on process variabilities within the on-chip decoder reference buffer memory. More specifically we introduce an H.264 video transcoding scheme in which the bitstream generated by transcoder is tolerant to defective SRAM cells that reside in the decoder reference buffer. Such error aware scheme allows for voltage scaling on decoder reference buffer in the presence of process variation and can result in significant power reduction considering the increasing power share of memories on SoCs. Our estimate shows this scheme can manage to realize about 40% power saving on decoder devices (in 32 nm) while preserving the decoded video quality and the bitrate of the bitstream.

关键词： Decoding Streaming media System-on-a-chip Pixel Random access memory transcoding

来源：评论

学校读者我要写书评

暂无评论

A System for Real-Time transcoding and Delivery of Video to Smartphones

A System for Real-Time Transcoding and Delivery of Video to ...

引用

International Conference on Information Visualisation (IV)

作者： Lior D. Shefer Francis T. Marchese Computer Science Department Pace University NY USA

This paper presents a report of a system that delivers customized video content to mobile devices. Constructed from open source components, it can stream transcoded video to mobile devices in real-time. In addition, it allows publishers to add content into their video streams on-the-fly. As a demonstration of this system's capabilities, an application was designed to deliver transcoded Adobe Flash content to Apple iPhones in real-time with the insertion of randomly selected commercial content.

关键词： Streaming media Smart phones Web services transcoding Real time systems

来源：评论

学校读者我要写书评

暂无评论

A fast mode decision algorithm for downscaled transcoding of H.264 preencoded video

A fast mode decision algorithm for downscaled transcoding of...

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Matthias von dem Knesebeck Panos Nasiopoulos University of British Columbia Vancouver Canada

ISBN: (纸本)9781424443147

In this paper, we present a fast mode decision method for transcoding pre-encoded H.264 video to a lower resolution. The algorithm reduces the computational load of the mode decision process during transcoding by adaptively considering information from the residual of the pre-encoded video and some intermediate results obtained in the re-encoding process. A performance improvement of 37% has been achieved compared to the best existing downscaling transcoding process known as the area-weighted vector median filter (AWVM).

关键词： transcoding Streaming media Encoding Filters Councils Lagrangian functions Reservoirs Energy storage Bandwidth Constraint optimization

来源：评论

学校读者我要写书评

暂无评论

Efficient mode decision for H.264/AVC frame-skipping transcoding

Efficient mode decision for H.264/AVC frame-skipping transco...

引用

IEEE Region 10 International Conference TENCON

作者： Jhong-Hau Jiang Yinyi Lin Department of Communication Engineering National Central University Taiwan

This paper proposes an efficient inter/intra mode decision for H.264/AVC frame-skipping transcoding. In the proposed algorithm, all information including mode, motion vector etc. are reused when the selected best frame is not skipped; while an efficient mode decision is employed when the best frame is dropped. The experimental results reveal that average 70% of computation time can be saved for the proposed H.264 frame-skipping transcoding algorithm, when compared with fully decoding/encoding procedure. The degradation in the rate-distortion performance is fairly small.

关键词： transcoding Automatic voltage control Algorithm design and analysis Streaming media PSNR Degradation

来源：评论

学校读者我要写书评

暂无评论

Encryption for High Efficiency Video Coding with Video Adaptation Capabilities

引用

IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 2013年第3期59卷 634-642页

作者： Van Wallendael, Glenn Boho, Andras De Cock, Jan Munteanu, Adrian Van de Walle, Rik Univ Ghent iMinds Dept Elect & Informat Syst Multimedia Lab B-9000 Ghent Belgium Katholieke Univ Leuven Dept Elect Engn Louvain Belgium Vrije Univ Brussel iMinds Dept Elect & Informat Brussels Belgium

Video encryption techniques enable applications like digital rights management and video scrambling. Applying encryption on the entire video stream can be computationally costly and prevents advanced video modifications by an untrusted middlebox in the network, like splicing, quality monitoring, watermarking, and transcoding. Therefore, encryption techniques are proposed which influence a small amount of the video stream while keeping the video compliant with its compression standard, High Efficiency Video Coding. Encryption while guaranteeing standard compliance can cause degraded compression efficiency, so depending on their bitrate impact, a selection of encrypted syntax elements should be made. Each element also impacts the quality for untrusted decoders differently, so this aspect should also be considered. In this paper, multiple techniques for partial video encryption are investigated, most of them having a low impact on rate-distortion performance and having a broad range in scrambling performance(1).

关键词： High Efficiency Video Coding encryption transcoding video scrambling

来源：评论

学校读者我要写书评

暂无评论

IPTV transcoding to Avoid Network Congestion

IPTV Transcoding to Avoid Network Congestion

引用

International Conference on Networking and Services (ICNS)

作者： Marcelo Atenas Alejandro Canovas Miguel Garcia Jaime Lloret Instituto de Investigación para la Gestión Integrada de Zonas Costeras Universidad Politécnica de Valencia Valencia Spain

ISBN: (纸本)9781424459278

IP Television (IPTV) is a new service that is growing up very quick in recent years. Its implementation is performed as a Triple-Play service, being the integration of voice, high-speed data and television. Moreover, the network traffic has been increased due to the use of VoIP, video or P2P. It is also creating congestion problems to the network provider and has high impact on the quality of IPTV. For this reason, it is necessary to provide tools in order to reduce the congestion and provide the maximum Quality of Experience to the customers. In this paper we analyze the bandwidth used by a movie and we propose a video transcoder as a tool to control the congestion in IPTV networks. The results obtained are similar to the traffic shaping. The measurements obtained in our test bench shows that a video transcoder can be used to guarantee a certain QoE, in the presence of congestion.

关键词： IPTV transcoding Traffic control Communication system traffic control Telecommunication traffic TV Bandwidth Testing Next generation networking Motion pictures

来源：评论

学校读者我要写书评

暂无评论

Measurement and Analysis of an Internet Streaming Service to Mobile Devices

引用

IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS 2013年第11期24卷 2240-2250页

作者： Liu, Yao Li, Fei Guo, Lei Shen, Bo Chen, Songqing Lan, Yingjie George Mason Univ Dept Comp Sci Fairfax VA 22030 USA Ohio State Univ Dept Comp Sci & Engn Columbus OH 43210 USA XinLab Inc Vuclip Milpitas CA 95035 USA Peking Univ Guanghua Sch Management Beijing 100871 Peoples R China

Receiving Internet streaming services on various mobile devices is getting increasingly popular, and cloud platforms have also been gradually employed for delivering streaming services to mobile devices. While a number of studies have been conducted at the client side to understand and characterize Internet mobile streaming delivery, little is known about the server side, particularly for the recent cloud-based Internet mobile streaming delivery. In this work, we aim to investigate the Internet mobile streaming service at the server side. For this purpose, we have collected a 4-month server-side log on the cloud (with 1,002 TB delivered video traffic) from a top Internet mobile streaming service provider serving worldwide mobile users. Through trace analysis, we find that 1) a major challenge for providing Internet mobile streaming services is rooted from the mobile device hardware and software heterogeneity. In this workload, we find over 3,400 different hardware models with more than 100 different screen resolutions running 14 different mobile OS and three audio codecs and four video codecs. 2) To deal with the device heterogeneity, CPU-intensive transcoding is used on the cloud to customize the video to the appropriate versions at runtime for different devices. A video clip could be transcoded into more than 40 different versions to serve requests from different devices. 3) Compared to videos in traditional Internet streaming, mobile streaming videos are typically of much smaller size (a median of 1.68 MBytes) and shorter duration (a median of 2.7 minutes). Furthermore, the daily mobile user accesses are more skewed following a Zipf-like distribution but users' interests also quickly shift. Considering the huge demand of CPU cycles for online transcoding, we further examine server-side caching to reduce the total CPU cycle demand from the cloud. We show that a policy considering different versions of a video altogether outperforms other intuitive ones when the ca

关键词： Internet mobile streaming heterogeneity popularity transcoding

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：