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检索条件"任意字段=Conference on Multimedia Content Access - Algorithms and Systems"

共 2015 条记录，以下是1581-1590 订阅

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Blind channel estimation in synchronous MC-CDMA system with consideration of carrier offset compensation

Blind channel estimation in synchronous MC-CDMA system with ...

引用

55th IEEE Vehicular Technology conference (VTC 2002)

作者： Feng, AG Yin, QY Zhang, JG Deng, K Xi An Jiao Tong Univ Sch Elect & Informat Engn Inst Informat Engn Xian 710049 Peoples R China

ISBN: (纸本)0780374843

The Multicarrier code division multiple access (MCCDMA) is a flexible and adaptive radio interface to provide dynamical bit rate transmission and a variety of services on radio channels. It can sufficiently utilize the subcarrier diversity and meet the demand of diverse multimedia services;therefore it is broadly considered as an effective approach for future wireless multimedia communications. But it is very sensitive to carrier drifts, while the orthogonal property between the subcarriers is lost with frequency offset. An accurate channel estimate allows the use of multiuser detection. After reviewing some blind channel estimation algorithms with the signal time domain structure and statistic characteristic, we propose a constant modulus based adaptive blind channel estimation at the base station for MC-CDMA systems in frequency-selective fading channel environment with the consideration of carrier offset compensation. Compared with the SVD-based method and Finite Alphabet-based method, it illustrates the effectiveness with numerical simulations.

关键词： Code division multiple access

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Dynamic reconfiguration of continuous media server with changing access frequency

Dynamic reconfiguration of continuous media server with chan...

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Internet multimedia Management systems III conference

作者： Kim, SH Yong, L Univ Denver Dept Comp Sci Denver CO 80208 USA

ISBN: (纸本)0819446416

Due to skewed popularity of objects in many continuous media applications, data placement, techniques such as selective replication have been introduced to resolve potential load imbalance problem by providing more replicas for more popular objects, resulting in a higher availability of hot objects and a more efficient usage of bourided storage space. To fully harness the advantage of selective replication technique, one may need to periodically reconfigure the number of instances of objects and data placement of them to tune up the system performance because, in reality, access frequency varies over time in many reasons. Reconfiguration usually requires time and disk bandwidth resulting in a degradation of the system performance during the process. This paper proposes algorithms for dynamic reconfiguration of continuous media servers based on ever changing popularity of objects. This paper quantifies the expected startup latency and reconfiguration overhead. Proposed analytic models and simulation results demonstrate that the proposed reconfiguration process is feasible in a reasonable amount of time. They also show tolerable performance degradation due to bandwidth overhead during reconfiguration process, which is critical for most real applications.

关键词： reconfiguration video server startup latency access frequency replication.

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Efficient key-frame extraction and video analysis

Efficient key-frame extraction and video analysis

引用

3rd International conference on Information Technology: Coding and Computing (ITCC 2002)

作者： Calic, J Izquierdo, E Univ London Multimedia & Vis Res Lab London WC1E 7HU England

ISBN: (纸本)0769515061;076951507X

content based video indexing and retrieval has its foundations in the analyses of the prime video temporal structures. Consequently, technologies for video segmentation and key-frame extraction have become crucial for the development of advanced digital video systems. Conventional algorithms for video partitioning and key-frame extraction are mainly implemented autonomously. By focusing he analysis on the compressed video features, this paper introduces a real-time algorithm for scene change detection and key-frame extraction that generates the frame difference metrics by analysing statistics of the macro-block features extracted from the MPEG compressed stream. The key-frame extraction method is implemented using difference metrics curve simplification by discrete contour evolution algorithm. This approach resulted in a fast and robust algorithm. Results of computer simulations are reported.

关键词： Algorithm design and analysis Change detection algorithms content based retrieval Feature extraction Indexing Layout Partitioning algorithms Statistical analysis Transform coding Video compression

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International conference on Extending Database Technology, EDBT 2002 held with Workshops XMLDM, MDDE, and YRWS, 2002

引用

International conference on Extending Database Technology, EDBT 2002 held in conjuction with International Workshop on XML-Based Data Management, XMLDM 2002, 2nd International Workshop on multimedia Data and Document Engineering, MDDE 2002 and Young Researchers Workshop, YRWS 2002

ISBN: (纸本)3540001301

The proceedings contain 43 papers. The special focus in this conference is on XML, Metadata, Extraction of Structure Information and Transformation of XML-Documents. The topics include: A software architecture for XML-based metadata interchange in data warehouse systems;metrics for XML document collections;a web-oriented approach to manage multidimensional models through XML schemas and XSLT;XML documents;XML-based applications using XML schema;a structural numbering scheme for XML data;looking forward;grouping in XML;from syntactic to conceptual querying of XML;algorithms for temporal query operators in XML databases;an XML query language based on SQL and path tables;management of XML documents in object-relational databases;extraction of XML from relational databases;an experience in integrating entity-relationship models, relational databases, and XML technologies;storing and querying XML data in object-relational DBMSs;population and query interface for a content-based video database;a shot clustering technique for story browsing for large video databases;a pre-viewing step in video retrieval;multi-level weighting in multimedia retrieval systems;towards enhanced compression techniques for efficient high-dimensional similarity search in multimedia databases;a relaxed algorithm for similarity queries performed with high-dimensional access structures;adaptive cycle extension in multimedia document retrieval;intelligent image clustering;mining html pages to support document sharing in a cooperative system;modeling a corporate information system to improve knowledge management;two complementary frameworks and mobile access to distributed data sources.

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Intelligent systems for Video Analysis and access Over the Internet

引用

2002年

作者： Wensheng Zhou C C Jay Kuo

ISBN: (纸本)9780130471178

From the Book: PREFACE The explosion of on-line web information has given rise to many query-based textsearch engines (such as Alta Vista) and manually constructed topic hierarchies (suchas Yahoo!). With the current growth rate of web information, especially broadbandmultimedia data, query data are growing incomprehensibly large and manual classification in topic hierarchies is creating a major bottleneck. Consequently, the hugeamount of multimedia data is imposing on people a heavy burden of manipulating, searching, interpreting, skimming, and integrating information. Thus, efficientmultimedia content analysis tools are needed to address these user's needs. This book presents a solution to problems arising from the demand for fastinformation access and for sharing in real-time multimedia transmission over theInternet. We present in this book a solution which exploits software agents thatare placed throughout the network environment. These hierarchical video analysisagents process multimedia streams in real time, and automatically decompose andunderstand the multimedia content so as to facilitate information access and sharing. multimedia content contains both the perceptual content such as color, motion,or acoustic features and the conceptual content, which is specified based on conceptsor semantics that can be expressed by text descriptions. Both types of contents areembedded simultaneously in multimedia streams, and usually are complementaryto each other. This book adaptively analyzes both kinds of video contents bycombining mixed media cues from audio, video and text. First, a high-performance module for on-line video segmentation based on scene-change detection isdescribed. The module serves as the first step of any videostream construction and analysis. To meet the high computational demand, ourproposed video scene change detection algorithms are very efficient while maintaining high accuracy and recall rates for fast on-line video analysis. Second, the percep

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Deploy multimedia-on-demand services over ADSL networks 3rd

Deploy multimedia-on-demand services over ADSL networks

引用

3rd IEEE Pacific Rim conference on multimedia, PCM 2002

作者： Lo, Chih-Cheng Chen, Wen-Shyen E. Institute of Computer Science National Chung-Hsing University Taichung40227 Taiwan

ISBN: (纸本)3540002626

As the broadband information highway being constructed, many multimedia applications will be realized. Nowadays, customers desired not only purely high-speed Internet access, but also versatile interactive multimedia applications. This article illustrates a multimedia-on-demand (MOD) system that can be provided by incumbent telcos. It provides both multicast and unicast streaming services, including True VOD, Near VOD, Live TV, KaraOK-ondemand (KOD), High-speed Internet access applications, and POTS services. In this paper, we give an overview of broadband access technologies, including HFC, ADSL, FTTx, MMDS/LMDS, and Satellite access networks, to support a MOD system. We also depict the components of deploying a large-scale MOD system from end to end, from customer premises equipment, video servers, storage system, network system, service management system, DBMS system, to content sources. Finally, we give a complete example to describe the signal flows among the components of the system. As we shall see, deregulation will accelerate the convergence of the telecommunications, cable TV, entertainment, and e-commerce while ADSL is the mainstream technology of access network today and provides a viable solution to the multimedia-on-Demand services. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Interactive computer systems

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Multiple granularity access to navigated hypermedia documents using temporal meta-information 3rd

Multiple granularity access to navigated hypermedia document...

引用

3rd IEEE Pacific Rim conference on multimedia, PCM 2002

作者： Chu, Wei-Ta Chen, Herng-Yow Department of Computer Science and Information Engineering National Chi Nan University Puli Nantou545 Taiwan

ISBN: (纸本)3540002626

Various multimedia document systems that capture, integrate, and synchronously present media have been implemented in many areas. As data volume grows and the diversity of new medium increases, how to efficiently locate the segments of interest is an important issue. To address this problem, this paper presents a framework that facilitates multiple levels of access to navigated hypermedia documents in three different granularities: HTML slide level, navigation event level, and sentence level. In contrast to traditional approaches, hierarchical access structure of navigated hypermedia documents can be exploited by analyzing temporal meta-information captured in the recording stage or computed in the speech-text alignment process. The proposed framework has been applied in the developed "Web-based Synchronized multimedia Lecture System" for efficient content access. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Navigation

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Performance of power control algorithms in wideband CDMA systems

Performance of power control algorithms in wideband CDMA sys...

引用

Student conference on Research and Development, SCOReD 2002

作者： Sim, Moh Lim Chuah, Han Teik Faculty of Engineering Multimedia University CyberjayaSelangor63100 Malaysia

ISBN: (纸本)0780375653

In cellular WCDMA systems, power control is used to assist the receiver to achieve minimum signal power deviation from its desired mean value. By minimising the signal power variation, the desired bit error rate of the desired user can be achieved while causing minimum interference to other multiple access users. We investigate two power control algorithms. Namely, the conventional fixed step-size power control algorithm and the newly proposed adaptive step-size algorithm. Simulations on a frequency selective fading, L-resolvable multipaths reverse link system were carried out. Lastly, results in terms of bit error probability for the above mentioned algorithms were presented. © 2002 IEEE.

关键词： Frequency selective fading

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A distance education system using MSP data control

A distance education system using MSP data control

引用

IEEE International conference on Acoustics, Speech, and Signal Processing

作者： Kodama, M Takahashi, H Murasaki, M Hiroshima Univ Higashihiroshima 7398521 Japan

ISBN: (纸本)0780374029

We had indicated multimedia communication services, which can provide multimedia information according to functionality and availability for users. We had already proposed "multimedia Scalability Package: MSP" as data structure in integrated multimedia services. In this paper, we proposed a distance education system based on MSP data communication as one of MSP multimedia services. We especially considered this system using proceedings data and video contents. The structuring methods of data architecture are used scalability. We had studied description schemes in MSP data, such as, header information and behavior information of content data for tele-lecturing system. It is needed to update mode data, which could control remote play and MSP data access in user side. That's because we send only control data in the case of remote control, any network environment is available, such as, wide band, narrow band and wireless network. In this system, to decode MSP data realized a virtual tele-lecturing system between presenter's and users' terminals. Moreover, overview of this system was shown. MSP data has been previously transmitted to data repository in users' terminals, They are points that it uses information key as manipulation of lecture data, and that this key simultaneously works all data. For example, when lecture's data has contents scalability of abstract data, data for 3 minutes and full data for 10 minutes, level information controls to play contents. Finally, this system architecture was indicated, and procedure of MSP data and MSP data structure were explained and were simulated. So it was shown that this system was available as tele-lectures.

关键词： distance learning multimedia communication interactive systems data structures synchronisation multimedia services MSP data control distance education system packaged data multimedia Scalability Packages virtual tele-lecturing system MSP data communication video data proceeding data presenter terminal audience terminals

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Intellimedia systems: Research and applications at the intersection of multimedia and artificial intelligence 7th

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7th Pacific Rim International conference on Artificial Intelligence, PRICAI 2002

作者： Rist, Thomas German Research Center for Artificial Intelligence Stuhlsatzenhausweg 3 Saarbrücken66123 Germany

ISBN: (纸本)3540440380

Solutions to challenging applications often emerge from a fruitful combination of knowledge, methods, and techniques from different disciplines. This talk introduces Intellimedia, a promising research field located at the intersection of research on multimedia systems and Artificial Intelligence. In essence, Intellimedia research aims at the innovative and intelligent usage of multiple media to improve human-machine interfaces as well as computer-mediated human-human communication. Hereby the attribute "intelligent" eventually refers to the deployment of AI techniques, such as knowledge representation, planning, rule-based reasoning, constraint satisfaction, and machine learning. The broad variety of potential Intellimedia application fields will be illustrated by a number of selected scenarios taken from ongoing projects. Among these scenarios are: electronic show rooms in which life-like characters convey product information to the user in the form of possibly interactive performances, mobile access to multimedia content on the web, and personalized in-car entertainment services. © Springer-Verlag Berlin Heidelberg 2002.

关键词： multimedia systems

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