一种专用地面会议电视网络技术的实现

会议电视系统是一种新的多媒体通信业务系统,多媒体信息是指集视觉、听觉和各种用户数据(多媒体数据)于一体的信息系统。提出了一种专用地面会议电视网络的实现方案,从工程实现的角度介绍了地面会议电视系统的组成,会议电视系统的主要功能以及本系统采用的一种特殊帧结构技术。该系统已成功应用于某部门的会议电视系统工程,并有广泛的推广应用前景。     

计算机多媒体教学方式的利与弊

多媒体教学是信息技术与课程整合的一个组成部分。本文罗列了多媒体教学的种种优势之后,又分析了它的局限性。并针对这些问题,就多媒体教材建设学点信息技术与课程整合的基本理论、创建课件的几个原则和组织好课堂教学,讨论了多媒体教学的几点对策。展望了计算机多媒体教学方式的未来。最后,谈到了对计算机多媒体网络教学方式进行评价的问题。     

Multimedia Education in Computer Science: A Little Bit of Everything Is Not Enough

Media Impact usually focuses on the practical impact of multimedia research on IT business. Yet given the pervasiveness of multimedia technology in our everyday life, a thorough reflection on the impact of multimedia progress on education and, in particular, multimedia education is overdue. Multimedia teachers at the 2007 ACM Multimedia conference engaged in a panel discussion on the current state and future of multimedia education. In this issue's,Wolfgang Hürst of Utrecht University and his colleagues Gerald Friedland of the International Computer Science Institute, Berkeley, and Lars Knipping of Berlin University of Technology use this panel as an opportunity to argue the need for a dedicated multimedia curriculum in computer science education.     

计算机多媒体会议中管理与控制子系统的设计

简要介绍了计算机多媒体会议系统的组成,重点分析了多媒体会议中的管理与控制子系统模块间的功能和相互关系。利用Agent技术实现了IP组播数据在广域网中的传输,并设计出了基于集中式控制的会议管理方案。     

B-ISDN multimedia workstation architecture

Technical issues involved in integrating computer and communication technologies in the broadband integrated services digital network (B-ISDN) environment are discussed. The Multimedia Environment for Remote Multiple-Attendee Interactive Decision-making (MERMAID), an ISDN-based multimedia and multiparty desktop conference system, is described. MERMAID involves B-ISDN key technologies related to multimedia and multicast protocols, and workstation architecture for groupware applications. Technical issues based on user experiences and evaluations of MERMAID over three years are presented and discussed in connection with the system's evolution in the B-ISDN environment     

2017年欧洲光通信会议述评

介绍了第43届欧洲光通信会议的概况,评述了主题报告、专题研讨、综述指导报告和特邀报告、截后论文和展览会等内容。按照光纤、光纤器件和光纤放大器,集成光电器件和光处理器,光通信系统数字技术,传输子系统和光网络单元,数据通信和计算机硬件,点到点传输链路,核心、城域和数据中心网络,接入、本地和家庭网络8个方向进行探讨。     

多媒体通信及其实现技术

本文主要讨论多媒体通信及其实现技术。文中先描述了多媒体通信的体系结构模式；论述了多媒体通信的应用及分类；接着讨论了多媒体通信的有关技术特征；然后提供了一个多媒全桌面会议系统的应用实例。     

Teaching content creation with programming

Multimedia is an art form that uses computers as a means of personal expression. However, much multimedia content is unattractive, and many applications have poor user interfaces because many developers don't have training in both programming and content creation. To counteract this, we teach students QuickTime for Java, which provides a rich library for manipulating media. Our students reported an increased understanding of multimedia programming and developed creative skills.     

采用IP网实现多媒体会议电视系统

文章在介绍多媒体会议电视特征与RSVP协议的基础上,较为详细地分析了采用IP网的多媒体会议电视系统,探讨了其应用前景。     

高速信息网络关键技术—成组广域广播与QoS控制

成组广域广播虚拟网络技术是高速信息网络的关键之一，它直接影响多媒体通信技术的发展与应用，本文综述介绍成组广域广播技术以及与此相关的网络服务品质ＱｏＳ的控制，管理技术的现状，发展趋势以及研究方向。     

Multipoint communication and group working for businessapplications: goals and initial results of the MIMIS project

The paper presents a brief overview of project R2025 MIMIS (Multipoint Interactive Multimedia Interpersonal System) of the European Community's RACE II programme. The project is dedicated to the development of a desktop broadband multimedia conference system. The system will be designed according to the business communication requirements of its potential users and user groups. The practical aim of the project is to develop four demonstrators: three intermediate versions and a final one, containing all conference facilities, using an ATM broadband network. It describes the project's aims, the distinction between MIMIS and commercially available systems and initial results of the study on user requirements and the system specification     

Multimedia retrieval benchmarks

Multimedia retrieval systems' development has long been challenged by the lack of standard benchmarks for evaluating and comparing the performance of emerging techniques. However, two recent benchmarking efforts, TREC Video Retrieval Evaluation (TRECVID) and the IAPR TC-12 Benchmark for Visual Information Search, show great promise for letting the multimedia retrieval community collaborate on advancing the state of the art.     

聚焦视频交互式多媒体业务：视频交互式多媒体业务研究进展

随着互联网和移动通信网的逐渐普及,视频交互式多媒体业务迅速发展,带来了庞大的市场和产业价值,成为未来通信业务新的增长点。本文首先介绍了国内外视频交互式多媒体业务的开展情况,然后,从共性技术、基础标准．系统标准和系统平台四个方面详细介绍了视频交互式多媒体业务的技术体系。近年来视频交互式多媒体业务技术变化日新月异,新技术层出不穷,极大地提高了业务的服务质量。本文最后着重介绍了视频交互式多媒体业务中的虚拟现实技术、视频转码技术、多媒体检索技术及最新技术进展及其给视频交互式多媒体业务所带来的变化。     

视频交互式多媒体业务研究进展

 随着互联网和移动通信网的逐渐普及,视频交互式多媒体业务迅速发展,带来了庞大的市场和产业价值,成为未来通信业务新的增长点。本文首先介绍了国内外视频交互式多媒体业务的开展情况,然后,从共性技术、基础标准、系统标准和系统平台四个方面详细介绍了视频交互式多媒体业务的技术体系。近年来视频交互式多媒体业务技术变化日新月异,新技术层出不穷,极大地提高了业务的服务质量。本文最后着重介绍了视频交互式多媒体业务中的虚拟现实技术、视频转码技术、多媒体检索技术及基于视觉特性的高效视频编码技术等方面的最新技术进展及其给视频交互式多媒体业务所带来的变化。     

武汉国际博览中心数字会议系统设计

介绍了武汉新城国际博览中心二期国际会议中心会议系统工程的工程特点、技术要求,以及大宴会厅数字红外语言分配系统、高级会议室无纸化多媒体会议系统、报告厅扶手嵌入式数字会议系统和中小型会议室数字红外无线会议系统的设计与实施过程。该数字会议系统的设计建设无论从先进性、实用性、节能环保方面都进行了充分的考虑,同时也保证了全系统的完整,是国内近年来数字会议系统具有代表性的项目之一。     

Editorial: Technologies for interactive multimedia services

The last few years have witnessed a significant development in the means to produce and make available multimedia content, namely owing to the democratisation of access to digital picture and video cameras in addition to the generalisation of Internet usage. The trend now is to allow ubiquitous access to this ever-increasing amount of multimedia content, enabling a user to find effectively the desired information. This Special Section of IEE Proceedings Vision, Image & Signal Processing addresses some of the enabling technologies for providing interactive multimedia services. All the papers in this Special Section correspond to extended versions of papers presented at the 5th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS) held in April 21-23, 2004, at the Instituto Superior Te/spl acute/cnico, Lisboa, Portugal.     

Signaling for multimedia conferencing in 4G: the case of integrated 3G/MANETs

Fourth-generation wireless systems are composed of coexisting and cooperating legacy and new networks. Mobile ad hoc networks are examples of new networks. They have several attractive characteristics and are gaining more and more momentum. Their integration with legacy third-generation networks is now being contemplated. Multimedia conferencing is the basis of a wealth of applications, including video conferences, multiparty games, and distance learning. Signaling is the central nerve of multimedia conferencing. It establishes, modifies, and tears down multimedia conferencing applications. This article is devoted to the signaling aspects of multimedia conferencing in 4G and focuses on the specific case of integrated 3G/MANETs. It reviews the standard 3G architecture and the emerging architectures for MANETs. This review shows that none of them is suitable for integrated 3G/MANETs. We propose a new architecture based on application-level clusters and conference gateways. We have implemented a prototype using the session initiation protocol (SIP) technology.     

使用ISDN基本访问的多点多媒体会议

多点多媒体会议是多媒体通信的一个十分重要的应用。本文首先概述多点会议的网络配置、通信要求和协议要求，接着介绍了多媒体会议桥或者叫多点控制的功能，最后介绍多点会议的有关标准。     

移动互联网助推移动视讯发展

随着移动互联网的飞速发展,移动网络速度不断提升,智能终端成本持续下降,移动互联网为多媒体视讯发展带来新的增长契机——移动视讯。结合移动应用、位置定位、传感器件等智能终端技术,移动视讯在监控、会话、会议、消息等方面得到广泛应用。同时,移动互联网催生了包括微视频、富媒体广告在内的多种新颖移动视讯形式。移动互联网在提升移动视讯服务质量的同时,在应用的深度和广度上也极大程度地推动移动视讯的发展。但是受限于移动智能终端的特点和无线数据信道的稳定性差,移动视讯也存在诸多问题。本文首先阐述移动视讯技术需求和移动互联网特点优势,进而介绍移动互联网在移动视讯中典型应用,最后分析移动视讯存在的问题。     

Media handling aspects of multimedia conferencing in broadband wireless ad hoc networks

The emergence of broadband wireless technologies has made broadband wireless ad hoc networks a reality. Broadband wireless ad hoc networks are infrastructure-less and can be used in a wide range of scenarios in private, public, commercial, and military settings. Multimedia conferencing is an important application area. Its two main components are signaling and media handling. This article focuses on the media handling aspects or multimedia conferencing in broadband wireless ad hoc networks, with a critical review of the state of the art and a proposed novel architecture. The main components of this architecture are a distributed mixing system and a self-organizing system. The distributed mixing system is a two-level structure. The first level is a full mesh network of active nodes that act as media mixers. The second level is made up of passive nodes that rely on the mixers in the first level. Each second-level node is connected to a first-level node. The self-organizing system is based on a resource efficient scheme that provides for the automatic allocation (or deallocation) of mixers when the network grows (or shrinks). Furthermore, it enables the automatic assignment of new nodes to mixers when they join the conference. We have built a proof-of-concept prototype of the architecture and have evaluated the self-organizing system through simulations. We have simulated conferences and observed how mixers are allocated and deallocated. The simulations show that our self-organizing system utilizes resources efficiently in most cases.