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IEEE International Conference on multimedia Computing and systems (ICMCS)

作者： R. Luling Department of Mathematics and Computer Science University of Paderborn Germany

The paper presents algorithms and principles for the management of large scale broadband multimedia services. For the implementation of these services, we use a network of distributed media servers, storing broadband media information e.g. audio and video that are streamed from the server to the connected clients. The problem studied in the paper is the managing of media content on a server network. We present the "Distributed Server Management System (DSMS)" that performs an efficient content and service management on the distributed servers. The DSMS allows one to collect access patterns from the users of the multimedia services and uses this knowledge for the solution of some combinatorial optimization algorithms that have to be solved for an efficient assignment of media assets. We present these optimization algorithms and evaluate their performance using some benchmark instances.

关键词： Large-scale systems Network servers Streaming media content management Spine Bandwidth Bit rate Mathematics Computer science Large scale integration

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A geographic knowledge representation system for multimedia geospatial retrieval and analysis

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International Journal on Digital Libraries 1997年第2期1卷 132-152页

作者： Chen, Hsinchun Smith, Terence R. Larsgaard, Mary L. Hill, Linda L. Ramsey, Marshall MIS Department Karl Eller Graduate School of Management University of Arizona Tucson AZ 85721 McClelland Hall 430Z United States Alexandria Digital Library Project University of California at Santa Barbara Santa Barbara CA 93106 United States Map and Imagery Laboratory Davidson Library University of California at Santa Barbara Santa Barbara CA 93106 United States University of Maryland College of Library and Information Services Universities Space Research Association Center of Excellence in Space Data and Information Sciences Goddard Space Flight Center Code 930.5 Greenbelt MD 20771 United States MIS Departmen Karl Eller Graduate School of Management University of Arizona Tucson AZ 85721 McClelland Hall 430W United States

Digital libraries serving multimedia information that may be accessed in terms of geographic content and relationships are creating special challenges and opportunities for networked information systems. An especially challenging research issue concerning collections of geo-referenced information relates to the development of techniques supporting geographic information retrieval (GIR) that is both fuzzy and concept-based. Viewing the meta-information environment of a digital library as a heterogeneous set of services that support users in terms of GIR, we deffine a geographic knowledge representation system (GKRS) in terms of a core set of services of the meta-information environment that is required in supporting concept-based access to collections of geospatial information. In this paper, we describe an architecture for a GKRS and its implementation in terms of a prototype system. Our GKRS architecture loosely couples a variety of multimedia knowledge sources that are in part represented in terms of the semantic network and neural network representations developed in artifficial intelligence research. Both textual analysis and image processing techniques are employed in creating these textual and iconic geographical knowledge structures. The GKRS also employs spreading activation algorithms in support of concept-based knowledge retrieval. The paper describes implementational details of several of the components of the GKRS as well as discussing both the lessons learned from, and future directions of, our research. © Springer-Verlag 1997.

关键词： Geographic information retrieval Geographic knowledge representation Geospace Geospatically referenced information multimedia geospatial queries

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HybCAST: Rich content Dissemination in Hybrid Cellular and 802.11 Ad Hoc Networks

HybCAST: Rich Content Dissemination in Hybrid Cellular and 8...

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31st IEEE International Symposium on Reliable Distributed systems (SRDS)

作者： Ngoc Minh Do Hsu, Cheng-Hsin Venkatasubramanian, Nalini Univ Calif Irvine Dept Comp Sci Irvine CA 92697 USA Natl Tsing Hua Univ Dept Comp Sci Hsinchu Taiwan

ISBN: (纸本)9780769547848;9781467323970

We design, implement, and evaluate a middleware system, HybCAST, that leverages a hybrid cellular and ad hoc network to disseminate rich contents from a source to all mobile devices in a predetermined region. HybCAST targets information dissemination over a range of scenarios (e. g., military operations, crisis alerting, and popular sporting events) in which high reliability and low latency are critical and existing fixed infrastructures such as wired networks, 802.11 access points are heavily loaded or partially destroyed. HybCAST implements a suite of protocols that: (i) structures the hybrid network into a hierarchy of two-level ad hoc clusters for better scalability, (ii) employ both data push and pull mechanisms for high reliability and low latency dissemination of rich content, and (iii) implement a near-optimal gateway selection algorithm to minimize the transmission redundancy. To demonstrate its practicality and efficiency, we have implemented and deployed the HybCAST middleware on several Android smartphones and an in-network Linux machine that acts as a dissemination server. The system is evaluated via real experiments using a UMTS network and extensive packet-level simulations. Our experimental results from a live network show that HybCAST achieves 100% reliability with shorter latencies and lower overall energy consumption. Simulation results confirm that HybCAST outperforms other state-of-the-art systems in the literature. For example, HybCAST exhibits a 5 times reduction in the dissemination latencies as compared to other hybrid dissemination protocols, while its energy consumption is a third of a cellular-only dissemination system. Furthermore, the simulation results demonstrate that HybCAST scales well and maintains good performance under varying numbers of mobile devices, diverse content sizes, and device mobility.

关键词： Middleware dissemination multimedia reliability wireless networks approximation algorithms

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WCDMA for UMTS : radio access for third generation mobile communications /

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2001年

作者： Holma Harri

ISBN: (纸本)0471486876

From the Publisher: WCDMA for UMTS provides a complete picture of the Wideband CDMA (Code Division Multiple access) air interface of the 3rd generation cellular systems - UMTS (Universal Mobile Telecommunications systems). WCDMA is designed for multimedia communications including high quality images and video, and access to services with high data rates. These capabilities will create new business opportunities for manufacturers, operators and for the providers of content and applications. * Explains the key parts of the WCDMA standard and provides guidelines for its efficient use * Presents network dimensioning and coverage and capacity planning of WCDMA * Introduces radio resource management algorithms in the WCDMA network * Examines the coverage and capacity of WCDMA up to 2Mbps using numerous simulation results * Introduces the TDD (Time Divisions Duplex) mode * Discusses the co-existence of TDD and FDD (Frequency Divisions Duplex) and highlights their main differences Now includes the main modifications made to the 3GPP standard up until the end of 2000 and features the following new material: * Reference terminal classes * Current status of UMTS licensing * Capacity upgrade paths and capacity per km2 * Inter-frequency handovers and inter-system handovers to GSM * Antenna diversity gain measurements in the WCDMA experimental system Written by leading experts in the field, this practical approach to the key features in WCDMA will have wide-ranging appeal to Research and Development Engineers, Practising Engineers, Cellular Operators, Technical Managers and Students on Telecommunications courses.

关键词： Code division multiple access. Wireless communication systems Standards. Mobile communication systems Standards. Global system for mobile communications.

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Unsupervised Visual and Textual Information Fusion in CBMIR Using Graph-Based Methods

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ACM TRANSACTIONS ON INFORMATION systems 2015年第2期33卷 9-9页

作者： Ah-Pine, Julien Csurka, Gabriela Clinchant, Stephane Univ Lyon ERIC Lab F-69676 Bron France Xerox Res Ctr Europe F-38240 Meylan France

multimedia collections are more than ever growing in size and diversity. Effective multimedia retrieval systems are thus critical to access these datasets from the end-user perspective and in a scalable way. We are interested in repositories of image/text multimedia objects and we study multimodal information fusion techniques in the context of content-based multimedia information retrieval. We focus on graph-based methods, which have proven to provide state-of-the-art performances. We particularly examine two such methods: cross-media similarities and random-walk-based scores. From a theoretical viewpoint, we propose a unifying graph-based framework, which encompasses the two aforementioned approaches. Our proposal allows us to highlight the core features one should consider when using a graph-based technique for the combination of visual and textual information. We compare cross-media and random-walk-based results using three different real-world datasets. From a practical standpoint, our extended empirical analyses allow us to provide insights and guidelines about the use of graph-based methods for multimodal information fusion in content-based multimedia information retrieval.

关键词： algorithms Theory content-based multimedia information retrieval information fusion graph-based methods cross-media similarity random walk Visual reranking

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Design of a content based multimedia retrieval system

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WSEAS Transactions on Computers 2007年第3期6卷 413-418页

作者： Chung, Yuk Ying Ng, Ka Yee Liu, Liwei Chen, Xiaoming Shukran, Mohd Afizi Mohd Choi, Eric H.C. Shi, David Yu Chen, Fang School of Information Technologies University of Sydney Sydney NSW 2006 Australia Multimodal User Interface Program National ICT for Australia Eleveigh NSW 1435 Australia

The large and growing amount of digital data, and the development of the Internet highlight the need to develop sophisticated access methods that provide more than just simple text-based queries. Many programs have been developed with complex mathematics algorithms to allow the transformation of image or audio data in a way that enchances searching accuracy. However it becomes difficult when dealing with large sets of multimedia data. This paper proposes and demonstrates a content Based multimedia Retrieval System (CBMRS). The proposed CBMRS includes both video and audio retrieval systems. The content Based Video Retrieval System (CBVRS) based on DCT and clustering algorithms. The audio retrieval system based on Mel-Frequency Cepstral Coefficients (MFCCs), the Dynamic Time Warping (DTW) algorithm and the Nearest Neighbor (NN) rule.

关键词： multimedia systems

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Walsh-like nonlinear phase orthogonal codes for direct sequence CDMA communications

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2007年第7期55卷 3800-3806页

作者： Akansu, Ali N. Poluri, Radha New Jersey Inst Technol Dept Elect & Comp Engn Newark NJ 07102 USA

Walsh codes are perfectly orthogonal binary (antipodal) block codes that found their use in many popular applications over several decades including synchronous multiuser communications. It is well known in the literature that they perform poorly for the case of asynchronous multiuser communications. Therefore, the near-orthogonal and nonlinear phase Gold codes with better performance are the preferred user codes in asynchronous direct sequence code division multiple access (DS-CDMA) communications standards. In this paper, we relaxed linear phase requirements and new sets of Walsh-like nonlinear phase binary orthogonal user codes (transforms) are obtained for asynchronous and synchronous spread spectrum multiuser communications. It is shown that the proposed binary user code family outperforms the Walsh codes significantly and they match in performance with the popular, nearly orthogonal Gold codes closely for asynchronous multiuser communications in additive white Gaussian noise (AWGN) channels. It is also shown that all. of the binary code families considered in this paper performed comparable for Rayleigh flat-fading channels. We present in this paper that there are a good number of such desirable code sets available in the binary sample space with different transform sizes. These new binary sets with good performance and flexible code lengths might help us to improve the spread spectrum multiplexing capabilities of future wireline and wireless CDMA communications systems.

关键词： additive white Gaussian noise (AWGN) channel code division multiple access (CDMA) Gold sequences orthogonal binary codes Rayleigh flat-fading channel Walsh sequences

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Improving the RDP based applications by using HTML5 content representation

Improving the RDP based applications by using HTML5 content ...

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Mobile Devices and multimedia: Enabling Technologies, algorithms, and Applications 2016

作者： Ganji, Rama Rao Mitrea, Mihai Panovski, Dancho Joveski, Bojan Institut Mines-Telecom Telecom-SudParis UMR 8145 - MAP5 France Ustartapp France

Despite the large variety of "off the shelf" solutions and academic research studies, application virtualization for cloud distribution is still an open research topic, with significant issues to be solved, ranging from bridging the gap between users expectation of simple, intuitive and user-friendly access from any type of terminal and the fragmented landscape of SaaS offer, with peculiarities related to the hardware/software configurations and the optimization of the technical resources consumption. Our study investigates the possibility of using HTML5 a virtualization tool for RDP-based applications. Architectural modules related to the RDP content interception, conversion, adaptation, remote rendering and interaction are specified, designed and implemented. This architecture is validated under the framework of the MEDUSA European project, in partnership with medical institutions. The testbed considers a server and 5 mobile users, with heterogeneous devices (tablets, smartphones, laptops) running under iOS, Android and Windows operating systems. The objective/subjective evaluations demonstrated that: (1) the user experience is not reduced by the virtualization, (2) the network consumption is reduced by a factor of 1.8 with respect to state-ofthe- Art solutions. © 2016 Society for Imaging Science and Technology.

关键词： Windows operating system

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Multi-method audio-based retrieval of multimedia information

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WSEAS Transactions on Information Science and Applications 2010年第2期7卷 310-319页

作者： Malcangi, Mario DICo - Dipartimento di Informatica e Comunicazione Università Degli Studi di Milano Via Comelico 39 20135 Milano Italy

multimedia information and embedded systems are two major technological advances that have significantly changed the way people interact with systems and information in recent years. In this context, audio proves to be the most advantageous media for interacting with embedded systems and their content. Advantages include: hands-free operation;unattended interaction;and simple, cheap devices for capture and playback. The use of embedded systems to seek information stored locally or on the web points up several difficulties inherent in the nature of multimedia-information signals. These difficulties are especially evident when palmtop or deeply embedded devices are used for such purposes. Developing a set of digital-signal-processing- based algorithms for extracting audio information is a primary step toward providing user-friendly access to multimedia information and developing powerful communication interfaces. The algorithms aim to extract semantic and syntactic information from audio signals, including voice. Extracted audio features are employed to access information in multimedia databases, as well as to index it. More extensive, higher-level information, such as audio-source identification (speaker identification) and genre (in the case of music), must be extracted from the audio signal. One basic task involves transforming audio into symbols (e.g. music transformed into a score, speech transformed into text) and transcribing symbols into audio (e.g. score transformed into musical audio, text transformed into speech). The purpose is to search for and access any kind of multimedia information by means of audio. To attain these results, digital audio-processing, digital speech-processing, and soft-computing methods need to be integrated. Neural networks are used as classifiers and fuzzy logic is used for making smart decisions.

关键词： Music

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Ontology-Based access to multimedia Cultural Heritage Collections - The REACH Project

Ontology-Based Access to Multimedia Cultural Heritage Collec...

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Eurocon

作者： C. Doulaverakis Y. Kompatsiaris M.G. Strintzis Centre for Research and Technology Informatics and Telematics Institute Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

In this paper, an approach for providing unified access to heterogeneous distributed cultural heritage collections is presented. The proposed approach is developed within the framework of the REACH Greek National Project with the overall aim to provide a Web portal enabling access to different databases of cultural content with emphasis on multimedia material. In order to achieve this, the project employs ontology-based representation of cultural content, multimedia content-based search algorithms, hybrid ontology and content-based access and user-friendly search interfaces. This fusion approach provides users with resources for building queries of multimedia repositories sequentially using multiple individual search tools, and performs higher quality searching. In the current stage of development, real content such as inscriptions and coins from the Greco-Roman time period, has successfully been incorporated in the system

关键词： Ontologies Cultural differences Portals multimedia databases Information retrieval content based retrieval Material storage multimedia systems Informatics Telematics

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