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检索条件"任意字段=Conference on Multimedia Computing and Networking"

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Presentation processing support for adaptive multimedia applications

Presentation processing support for adaptive multimedia appl...

引用

conference on multimedia computing and networking 1996

作者： Posnak, EJ Vin, HM Lavender, RG UNIV TEXAS DEPT COMP SCIDISTRIBUTED MULTIMEDIA COMP LABAUSTINTX 78712

ISBN: (纸本)0819420417

This paper describes the design of and implementation of Presentation Processing Engines (PPEs) that provide flexible control over QoS to manage heterogeneity in networks, end- systems and compression formats. Development of PPEs is facilitated by a framework that provides the modular architecture, data types, and transformations common to most codecs, filters, transcoders, etc. to facilitate the implementation of emerging compression standards and their integration into media processing applications. By allowing fine-grained composition of compression and image processing modules, the framework facilitates the development of extensible presentation processing engines that can be dynamically configured to adapt to changes in resource availability and user preferences.

关键词： Personal protective equipment Signal to noise ratio Standards development Image enhancement multimedia Image compression Image quality Software development Spatial resolution Telecommunications

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multimedia information processing in the SWAN mobile networked computing system

Multimedia information processing in the SWAN mobile network...

引用

conference on multimedia computing and networking 1996

作者： Agrawal, P Hyden, E Krzyzanowski, P Srivastava, MB Trotter, J AT&T BELL LABS NETWORKED COMP RES DEPTMURRAY HILLNJ 07974

ISBN: (纸本)0819420417

Anytime anywhere wireless access to databases, such as medical and inventory records, can simplify workflow management in a business, and reduce or even eliminate the cost of moving paper documents. Moreover, continual progress in wireless access technology promises to provide per-user bandwidths of the order of a few Mbps, at least in indoor environments. When combined with the emerging high-speed integrated service wired networks, it enables ubiquitous and tetherless access to and processing of multimedia information by mobile users. To leverage on this synergy an indoor wireless network based on room-sized cells and multimedia mobile end-points is being developed at AT&T Bell Laboratories. This research network, called SWAN (Seamless Wireless ATM networking), allows users carrying multimedia end-points such as PDAs, laptops, and portable multimedia terminals, to seamlessly roam while accessing multimedia data streams from the wired backbone network. A distinguishing feature of the SWAN network is its use of end-to-end ATM connectivity as opposed to the connectionless mobile-IP connectivity used by present day wireless data LANs. This choice allows the wireless resource in a cell to be intelligently allocated amongst various ATM virtual circuits according to their quality of service requirements. But an efficient implementation of ATM in a wireless environment requires a proper mobile network architecture. In particular, the wireless link and medium-access layers need to be cognizant of the ATM traffic, while the ATM layers need to be cognizant of the mobility enabled by the wireless layers. This paper presents an overview of SWAN's network architecture, briefly discusses the issues in making ATM mobile and wireless, and describes initial multimedia applications for SWAN.

关键词： Asynchronous transfer mode multimedia Virtual colonoscopy Video Network architectures computing systems Data processing Local area networks Personal digital assistants Transceivers

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ActiveM(3) - An authoring system for active multimedia mail

ActiveM(3) - An authoring system for active multimedia mail

引用

conference on multimedia computing and networking 1996

作者： Schirmer, J Kirste, T COMP GRAPH CTR ZGDV DARMSTADTGERMANY

ISBN: (纸本)0819420417

Today the idea and the mechanisms of multimedia Mail (MMM), the transmission of multimedia information like images, audio and video objects etc. as an extension to email, and the related problems and solution concepts are very well known. The idea of Computational or Active Mail (AM) has existed since 1976;transfer programs embedded in standard mail which automatically execute at the receivers site, bringing mail to life. The integration of both mechanisms (MMM and AM) leads to the concept of Active multimedia mail. The object of ACTIVEM³ is the development and implementation of a system for the realization of Active multimedia Mail and a Composing Tool as an easy to use interactive authoring environment. This paper introduces the basic ideas. The results of the proposed concept are presented through a realized prototype. ©2004 Copyright SPIE - The International Society for Optical Engineering.

关键词： active mail computational mail multimedia mail MIME remote programming synchronization

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Design of a variable bit rate continuous media file server for an ATM network

Design of a variable bit rate continuous media file server f...

引用

conference on multimedia computing and networking 1996

作者： Neufeld, G Makaroff, D Hutchinson, N UNIV BRITISH COLUMBIA DEPT COMP SCIVANCOUVERBC V6T 1Z4CANADA

ISBN: (纸本)0819420417

This paper describes the design and implementation of a file server for variable bit rate continuous media. Most continuous media file servers have been designed for constant bit rate streams. We address the problem of building a server where each stream may have a different bit rate and, more importantly, where the bit rate within a single stream may vary considerably. Such servers will become increasingly more important because of Variable Bit Rate compression standards such as is possible with MPEG-2.

关键词： multimedia file servers variable bit rate admission control

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Internet stream synchronization using concord

Internet stream synchronization using concord

引用

conference on multimedia computing and networking 1996

作者： Sreenan, CJ Narendran, B Agrawal, P Shivakumar, N AT&T BELL LABS MURRAY HILLNJ 07974

ISBN: (纸本)0819420417

Using packet networks to transport multimedia introduces delay variations within and across streams, necessitating synchronization at the receiver. This requires stream data to be buffered prior to presentation, which also increases its total end to end delay. Concord recognizes that applications may wish to influence the underlying synchronization policy in terms of its effect on quality of service. It provides a single framework for synchronization within and across streams and employs an application specific tradeoff between packet losses, delay and inter- stream skew. We present a new predictive approach for synchronization and a selection of results from an extensive evaluation of Concord for use in the Internet. A trace driven simulator is used, allowing a direct comparison with alternative approaches. We demonstrate that Concord can operate with lower maximum delay and less variation in total end to end delay, which in turn can allow receiver buffer requirements to be reduced.

关键词： multimedia synchronization Internet quality of service

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The case for wireless overlay networks

The case for wireless overlay networks

引用

conference on multimedia computing and networking 1996

作者： Katz, RH Brewer, EA UNIV CALIF BERKELEY DEPT ELECT ENGN & COMP SCIBERKELEYCA 94720

ISBN: (纸本)0819420417

Wireless data services, other than those for electronic mail or paging, have thus far been more promising than successful. We believe that future mobile information systems must be built upon heterogeneous wireless overlay networks, extending traditional wired and internetworked processing "islands" to hosts on the move over coverage areas ranging from in-room, in- building, campus, metropolitan, and wide-areas. Unfortunately, network planners continue to think in terms of homogeneous wireless communications systems and technologies. In this paper, we describe a new wireless data networking architecture that integrates diverse wireless technologies into a seamless internetwork. In addition, we describe the applications support services needed to make it possible for applications to continue to operate as mobile hosts roam across such networks. The architecture described herein is being implemented in a testbed at the University of California, Berkeley under joint government/industry sponsorship. ©2004 Copyright SPIE - The International Society for Optical Engineering.

关键词： wireless communications mobile computing overlay networks bandwidth adaptive applications

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Quality of service support for networked multimedia workstations

Quality of service support for networked multimedia workstat...

引用

conference on multimedia computing and networking 1996

作者： Reynolds, PJ Beadle, HWP UNIV WOLLONGONG TELECOMMUN SOFTWARE RES CTRWOLLONGONGNSWAUSTRALIA

ISBN: (纸本)0819420417

The Communications Resource Manager (CRM) provides communications at a specified Quality of Service (QoS) for networked multimedia workstations in an environment where the network and workstation resources are changing. The CRM enables a consistent application interface and manages all workstation communications resources. It established network connections on behalf of applications, monitors their progress and notifies applications when network QoS events take place. Applications can then modify their behavior (compression rate, number of simultaneous media, media type) to cope with the change. The CRM provides mechanisms to negotiate at call setup time the level of multimedia support provided. If optimal resources are not available, call quality degradation paths allow call establishment at the highest QoS possible. Call admission based on on-going network performance monitoring and application performance feedback from the CRM can be used to prevent further QoS degradation by refusing to attempt connections when insufficient resources are available. The CRM enables existing multimedia workstations to communicate in an environment with known QoS. The CRM flows naturally into emerging QoS techniques for end-to-end ATM services. Because the CRM operates at the application level it is also applicable to the ATM interconnection of LANs whereas current ATM Forum proposals are not.

关键词： quality of service multimedia communications multimedia workstations connection management application programming interface ATM networks

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Maintaining temporal consistency of multimedia documents using constraint networks

Maintaining temporal consistency of multimedia documents usi...

引用

conference on multimedia computing and networking 1996

作者： Layaida, N SabryIsmail, L INRIA RHONE ALPES OPERA PROJECTF-38610 GIERESFRANCE

ISBN: (纸本)0819420417

The recent advances in multimedia systems, together with the advent of high speed networks, paved the way to a new generation of applications. In particular, the authoring environments have found in multimedia the means of increasing the richness of information contained in electronic documents. With the evolution of new computer systems that can handle multimedia information, time-based data can be integrated in electronic documents taking into account their temporal dimension. In such documents, temporal dependencies between the different media objects define a temporal structure within the document. This structure is the basic support for the representation of dependencies between data such as audio, video and virtual images. Furthermore, it allows the scheduling of presentation actions during the document presentation. The presentation of multimedia documents is dynamic and the positioning of objects in time together with their duration have to be specified. To achieve this operation efficiently, a high level temporal representation is needed which allows the author to specify all the temporal dependencies between multimedia objects. In this paper, we propose an interval-based temporal model and constraints which provide a basis for the management of the consistency of multimedia documents. We propose an efficient algorithm allowing the detection of a wide range of inconsistencies. The emphasis in the design of these algorithms is put on the handling of both the flexibility of temporal specifications and the indeterministic behaviour of some media objects. Furthermore, we use the logical organization of the document in nested entities to enhance the performance of the methods used for detecting inconsistencies. The aim of our approach is to fulfill the following requirements . Structured modelling: The document content is defined by a hierarchy of nested components where leaves are basic media objects and nodes composite objects. . Incremental manipulation of th

关键词： multimedia Chlorine Composites Video Visualization computing systems Data processing Human-machine interfaces Data integration Pollution control

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A buffering mechanism for multimedia client applications

A buffering mechanism for multimedia client applications

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conference on multimedia computing and networking 1996

作者： Tsuda, Y Nakamura, A TOSHIBA CO LTD CTR RES & DEVCOMMUN & INFORMAT SYST RES LABSKAWASAKIKANAGAWA 210JAPAN

ISBN: (纸本)0819420417

In conventional network processing models, a number of data-copies are needed for applications to receive data from network interfaces. This causes major overhead and becomes a serious limitation in distributed multimedia applications. Therefore, several mechanisms have been proposed for reducing the number of data-copies. We emphasize that the Single Virtual address Space (SVS) OS introduces a new buffering mechanisms for this purpose. In this paper, we describe our SVS OS, which we call "Cubix (CUBe of 2-byte unIX)", with a new Access Control List protection mechanism and a new buffering mechanism, which we call "Cstreams (Continuous streams)", based on it. We emphasize that our proposed Cstreams realizes a single data-copy network architecture. ©2004 Copyright SPIE - The International Society for Optical Engineering.

关键词： single virtual space multiple virtual space IPC ACL network module STREAMS single data-copy TCP/IP ATM Xserver-client system QoS

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Continuous media filters for heterogeneous internetworking

Continuous media filters for heterogeneous internetworking

引用

conference on multimedia computing and networking 1996

作者： Yeadon, N Garcia, F Hutchison, D Shepherd, D UNIV LANCASTER DEPT COMPLANCASTER LA1 4YRENGLAND

ISBN: (纸本)0819420417

There is now a huge variety of multimedia applications, network technologies and end-system architectures. Within this new and challenging environment, the importance of Quality of Service (QoS) mechanisms to allocate and monitor system resources has been recognized. A key goal of our research is how to manage the QoS requirements of heterogeneous receivers in applications that depend on multipeer communications. This paper presents results of our recent work on QoS filter mechanisms that operate on compressed video and audio streams. These filter mechanisms adapt the QoS of continuous media streams allowing diverse qualities of media to be delivered to a number of receivers in the same multipeer dissemination tree. The paper focuses particularly on filter operations applied to bandwidth-demanding video services in order to allow low capability clients, primarily connected via mobile and other low-bandwidth links, to participate in these dissemination services. This is performed without detriment to existing high capability clients. The results presented show the feasibility of providing individual QoS to individual clients.

关键词： filtering Quality of Service distributed multimedia compression

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