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

共 2919 条记录，以下是2721-2730 订阅

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Time representation and management in MADEUS: An authoring environment for multimedia documents

Time representation and management in MADEUS: An authoring e...

引用

1997 conference on multimedia computing and networking

作者： Jourdan, M Layaida, N SabryIsmail, L INRIA Rhone-Alpes (France)

ISBN: (纸本)0819424315

In this paper, we present the currently achieved results of our research goal: building an easy to use and powerful multimedia documents authoring environment, which provides high level of expressiveness and open document format. These results are concerned with both the time representation and the time management in our authoring system Madeus. In the first part of the paper, we describe the requirements that must be provided by a time representation of multimedia documents, the choice we made and a comparison with other existing approaches. In the second part, we describe the presentation lager of our system, and how it handles services such as dynamic formatting. Temporal Access Control operations and hyperlinks.

关键词： multimedia Video Clocks Composites Document management Human-machine interfaces Visualization Computer programming Control systems Interfaces

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A CORBA-based platform for distributed multimedia applications

A CORBA-based platform for distributed multimedia applicatio...

引用

1997 conference on multimedia computing and networking

作者： Blum, C Molva, R Institut Eurécom BP 193 Sophia-Antipolis F-06904 France

ISBN: (纸本)0819424315

As distributed multimedia applications are starting to be offered as services in enterprise and residential cable networks, there is a growing interest in platforms that provide a standard framework for the development and deployment of these applications. Key issues in platform design are service diversity, service portability and interoperability of user terminal equipment, We propose a platform architecture for the provision of multimedia communication services which logically separates application processing from media processing. Applications are installed in application pools from where they control a set of communicating multimedia terminals. Application-specific intelligence is downloaded into the terminals in the form of Tcl/Tk or Java scripts that generate graphical user interfaces, control media processing components, and communicate with the application in the pool. The platform architecture is based on CORBA and is defined as an extensible set of IDL interfaces for control and stream interfaces for multimedia communication. The platform supports application development with high-level programming interfaces.

关键词： networked multimedia applications teleconferences CORBA TINA IMA MSS

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Modeling video temporal relationships in an object database management system

Modeling video temporal relationships in an object database ...

引用

1997 conference on multimedia computing and networking

作者： Li, JZ Goralwalla, IA Ozsu, MT Szafron, D Univ. of Alberta (Canada)

ISBN: (纸本)0819424315

One of the key aspects of videos is the temporal relationship between video frames. In this paper we propose a tree-based model for specifying the temporal semantics of video data. We present a unique way of integrating our video model into an object database management system which has rich multimedia temporal operations. We further show how temporal histories are used to model video data, explore the video objectbase using object-oriented techniques. Such a seamless integration gives a uniform interface to end users. The integrated video objectbase management system supports a broad range of temporal queries.

关键词： multimedia temporal object-oriented database video model query clips

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Server selection on the Internet using passive probing

Server selection on the Internet using passive probing

引用

1997 conference on multimedia computing and networking

作者： Afonso, J Freitas, V Univ. do Minho (Portugal)

ISBN: (纸本)0819424315

This paper describes a server selection mechanism for connection oriented services based on passive probing. The criterion of selection is the quality of service expected from each server, expressed as a function of availability and response time. Measures from previous connections to servers made by local clients are used to continuously update a QoS database which the prediction algorithm uses to compute the response time expected in subsequent connections. The forecasting approach is mainly based on prior measurements of TCP connection establishment time. The maximum segment size (MSS) in a connection is also considered. The proposed metric is compared with other ones normally used to measure network proximity. Results show that the proposed server selection mechanism achieves a reduction of response time of over 50% compared with a random selection mechanism.

关键词： Time metrology Databases Internet Computer simulations Distance measurement Distributed computing Optical character recognition Precision measurement Quality measurement Statistical analysis

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Incorporating scalability into networked multimedia storage systems

Incorporating scalability into networked multimedia storage ...

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1997 conference on multimedia computing and networking

作者： Pegler, D Yeadon, N Hutchison, D Shepherd, D Univ. of Lancaster (United Kingdom)

ISBN: (纸本)0819424315

Incorporating scalability into the storage of multimedia should be a fundamental design issue that will enable the storage services of today to scale to meet the throughput and storage requirements of future multimedia applications. In this paper we address the issues of storage scalability in relation to the realtime, storage capacity and throughput requirements of multimedia data types (audio, video, text) and the effect these demands have on the level of scalability required. We describe a multimedia storage architecture that exhibits a high degree of scalability by exploiting the scalable properties of fast packet switched networks such as ATM. Storage scalability is achieved through the dynamic replication of both storage servers and data objects. This is performed within our ATM networking environment in order to support the continually changing requirements of heterogeneous end-systems and also as a means of providing efficient load balancing and real-time resource expandability. By utilising scalable compression technologies, the typical overheads incurred when copying between storage servers can be reduced to a minimum. A key feature of our storage architecture centres around storing continuous media files as a number of compressed components that can be re-located and re-combined at optimal locations within the distributed environment, using mixing agents;enabling efficient use of dynamically changing server, network and clients resources.

关键词： scalable multimedia storage compression mixing dynamic QoS

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Disk scheduling for displaying and recording video in non-linear news editing systems

Disk scheduling for displaying and recording video in non-li...

引用

1997 conference on multimedia computing and networking

作者： Aref, WG Kamel, I Niranjan, TN Ghandeharizadeh, S Panasonic Technologies Inc. (United States)

ISBN: (纸本)0819424315

Unlike video-on-demand servers, non-linear editing systems enable the user to manipulate the content of the video database. Applications such as news editing systems require that the underlying storage server be able to concurrently record live broadcast information, modify pre-recorded data, and broadcast an authored presentation. A multimedia storage server that efficiently supports such a diverse group of activities constitutes the focus of this study. Our contribution is a novel real-time disk scheduling algorithm that treats both read and write requests in a homogeneous manner in order to ensure that their deadlines are met. Simulation results demonstrate that the proposed algorithm offers low violations of read deadlines, reduces buffer requirements, and improves the throughput of the storage server by enhancing the utilization of available disk bandwidth.

关键词： multimedia video servers news editing disk scheduling real time scheduling

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multimedia systems for industrial surveillance

Multimedia systems for industrial surveillance

引用

1997 conference on multimedia computing and networking

作者： Sato, K Tsukada, A Matsuda, F Kawasaki, K Ozaki, M Mitsubishi Electric Corp. (Japan)

ISBN: (纸本)0819424315

The need for multimedia systems for industrial surveillance is rising in various industrial fields, such as plant monitoring, control systems, and security systems. In this paper, we concentrate on video information, which it is thought will be effective in surveillance support. We describe the development of our ''Media Controller'' as a platform for this multimedia system. A Media Controller individually records large capacity video data continuously with a camera, and provides video data according to the scene, time and QoS demanded by the surveillance center in real time. With the Media Controller, we can easily give facility surveillance applications new advanced functions. For example, the Media Controller can be connected to the plant facility alarms and provide video data before and after an alarm as soon as the alarm is activated. Moreover it does not fail to capture data even if many alarms occur in a short time. We propose a mechanism to manage video data which consists of a continuous recording, event recordings which are connected to the alarm events, and a long duration timelapse recording.

关键词： industry surveillance multimedia video QoS Media Controller disk access real time

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Supporting real-time multimedia traffic in a wireless LAN

Supporting real-time multimedia traffic in a wireless LAN

引用

1997 conference on multimedia computing and networking

作者： Muri, A GarciaLunaAceves, JJ Univ. of California/Santa Cruz (United States)

ISBN: (纸本)0819424315

The Group Allocation Multiple Access (GAMA) protocol for scheduling real-time and datagram traffic in a single-channel, single-hop, packet-radio network is specified and analyzed. By maintaining a dynamically-sized cycle that changes in length depending on the amount of network traffic, GAMA is able to provide bandwidth guarantees to the members of its ''transmission group'';member stations are able to transmit real-time data at a specified rate. Each cycle contains a contention period and a group-transmission period;a station with data to send competes for the right. to be added to the transmission group by successfully completing an RTS/CTS message exchange during the contention period. Once a station is a member of the transmission group, it is able to transmit a collision-free data packet during each cycle. As long as a station has data to send, it maintains its position in the group. This can be viewed as either allowing stations to ''share the floor'' in an organized manner, or as establishing frames that are not synchronized on a slot-basis and vary their length dynamically based on demand. The throughput and average delay of GAMA are presented and analyzed.

关键词： multimedia Local area networks Promethium Radon Signal detection Computer simulations Data modeling Picosecond phenomena Process modeling Computer science

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Scheduling of multimedia traffic for continuous media in packet-switched networks

Scheduling of multimedia traffic for continuous media in pac...

引用

1997 conference on multimedia computing and networking

作者： Khil, A Maeng, S Korea Advanced Institute of Science and Technology (South Korea)

ISBN: (纸本)0819424315

Many of multimedia applications in distributed systems should transmit continuous audio/video across networks when clients request. Typically, messages for continuous media in packet-switched networks are split into periodic, different sized packets with deadlines. Since clients request different typed services, traffic streams are heterogeneous. Furthermore, since the continuity of continuous media should be preserved, non-preemptive scheduling is preferred in multimedia communications. In this paper, we present a new non-preemptive scheduling algorithm which guarantees the timely delivery of more sets of messages for continuous media on a communication link connected to packet-switched networks. It schedules messages by using a heuristic based on the earliest deadline first (EDF) policy. It can always find a feasible schedule for messages which are schedulable by the EDF algorithm. We also present admission control given as sufficient conditions for a set of messages to be schedulable by the our scheduling algorithm for controlling the traffic load on a link. If a new request and the previous messages satisfy these conditions, it accepts the new request. The accepted message transmission is done like the circuit-switched transmission non-preemptively. Finally, we show the improvements in performance of our scheduling algorithm by simulation results.

关键词： multimedia traffic non-preemptive real-time scheduling packet-switched network deadline periodic first-packet-generation time feasible schedule admission control

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Network support for turn-taking in multimedia collaboration

Network support for turn-taking in multimedia collaboration

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1997 conference on multimedia computing and networking

作者： Dommel, HP GarciaLunaACeves, JJ Univ. of California/Santa Cruz (United States)

ISBN: (纸本)0819424315

The effectiveness of collaborative multimedia systems depends on the regulation of access to their shared resources, such as continuous media or instruments used concurrently by multiple parties. Existing applications use only simple protocols to mediate such resource contention. Their cooperative rules follow a strict agenda and are largely application-specific The inherent problem of floor control lacks a systematic methodology. This paper presents a general model on floor control for correct, scalable, fine-grained and fair resource sharing that integrates user interaction with network conditions (Quality-of-Service), and adaptation to various media types. The notion of turn-taking known from psycholinguistics in studies on discourse structure is adapted for this framework. Viewed as a computational analogy to speech communication, online collaboration revolves around dynamically allocated access permissions called floors. The control semantics of floors derives from concurrency control methodology. An explicit specification and verification of a novel distributed Floor Control Protocol (FCP) are presented. Hosts assume sharing roles that allow for efficient dissemination of control information, agreeing on a floor holder which is granted mutually exclusive access to a resource. Performance analytic aspects of floor control protocols are also briefly discussed.

关键词： floor control multimedia collaboration Quality-of-service adaptation resource sharing turn-taking

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