Publications of Wolfgang Effelsberg

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Artikel

Konferenz Beitrag

  • Albert Banchs, Wolfgang Effelsberg, Christian Tschudin und Volker Turau. IEEE Press, 1998 Multicasting multimedia streams with active networks . Los Alamitos, Calif.
  • Wolfgang Effelsberg. Springer, 1998 Erfahrungen aus den TeleTeaching-Projekten der Universität Mannheim . Berlin [u.a.]
  • Wolfgang Effelsberg. VDE-Verlag, 1998 Erfahrungen aus den TeleTeaching-Projekten der Universität Mannheim ITG-Fachbericht. Berlin [u.a.]
  • Wolfgang Effelsberg und Werner Geyer. Kluwer, 1998 Tools for Digital Lecturing - What We Have and What We Need . DeventerIn the past many distance learning projects have concentrated on the development of educational multimedia material for offline use. Effective learning requires online contact between teachers and students, and also among students. In this paper we claim that the multimedia application software we have today is insufficient for online (synchronous) teleteaching. We list the requirements for good teleteaching tools, analyze the deficiencies of existing software for the purpose of teleteaching, and present the teleteaching tools currently under development at the University of Mannheim.
  • Wolfgang Effelsberg, Werner Geyer und Andreas Eckert. Springer, 1998 Project TeleTeaching Mannheim-Heidelberg Proceedings of the ... annual conference of the Gesellschaft für Klassifikation e.V.. Berlin [u.a.]The technology needed for teleteaching is widely available today. Interest focuses on the use of multimedia technology and high-speed networks to disseminate course content and work and deepen understanding on the part of the students. The Universities of Mannheim and Heidelberg are engaged in a joint pilot project to develop and test new technologies for teleteaching in a digital network. High-capacity multimedia workstations and PSs are linked via ATM to enable access over the network to lectures, exercises and stored teaching materials. The departments of education and psychology of the two universities are scientifically advising and evaluating the project.
  • Werner Geyer und Wolfgang Effelsberg. AACE , 1998 The Digital Lecture Board - A Teaching and Learning Tool for Remote Instruction in Higher Education . Charlottesville, Va.This paper presents a novel, integrated teaching and learning tool - called digital lecture board - which takes into account the requirements of synchronous, computer-based distance education. For almost two years, the TeleTeaching project Mannheim-Heidelberg has been using video conferencing tools for transmitting lectures and seminars. These tools prove to be insufficient for the purpose of teleteaching since they are not powerful enough to support team work, they are not flexible enough for the use of media, and are somewhat difficult to handle by non-experts. We discuss shortcomings of the existing tools and disclose features we had in mind while designing the digital lecture board. Embedded in a teaching and learning system, the digital lecture board even allows for asynchronous usage modes, for instance, the preparation of lectures. Moreover, we cover implementation issues of the current prototype.
  • Rainer Lienhart, Wolfgang Effelsberg und Ramesh Jain. SPIE, 1998 Towards a Visual Grep: A systematic analysis of various methods to compare video sequences . Bellingham, Wash.In this paper, we consider the problem of similarity between video sequences. Three basic questions are raised and (partially) answered. Firstly, at what temporal duration can video sequences be compared? The frame, shot, scene and video levels are identified. Secondly, given some image or video feature, what are the requirements on its distance measure and how can it be ?easily? transformed into the visual similarity desired by the inquirer? Thirdly, how can video sequences be compared at different levels? A general approach based on either a set or sequence representa-tion with variable degrees of aggregation is proposed and applied recursively over the different levels of temporal res-olution. It allows the inquirer to fully control the importance of temporal ordering and duration. Promising experimental results are presented.
  • Rainer Lienhart, Wolfgang Effelsberg und Ramesh Jain. SPIE, 1998 VisualGREP: A Systematic Method to Compare and Retrieve Video Sequences Proceedings of SPIE. Bellingham, Wash.
  • Silvia Pfeiffer, Rainer Lienhart, Gerald Kühne und Wolfgang Effelsberg. Springer , 1998 The MoCA Project - Movie Content Analysis Research at the University of Mannheim Informatik '98 : Informatik zwischen Bild und Sprache. Berlin, Heidelberg

Buch

Forschungs Papier

  • Rainer Lienhart und Wolfgang Effelsberg. , Technical Reports. 1998 Automatic Text Segmentation and Text Recognition for Video Indexing Mannheim, . 98-009
    Efficient indexing and retrieval of digital video is an important function of video databases. One powerful index for retrieval is the text appearing in them. It enables content-based browsing. We present our methods for automatic seg-mentation of text in digital videos. The output is directly passed to a standard OCR software package in order to translate the segmented text into ASCII. The algorithms we propose make use of typical characteristics of text in videos in order to enable and enhance segmentation performance. Especially the inter-frame dependencies of the characters provide new possibilities for their refinement. Then, a straightforward indexing and retrieval scheme is intro-duced. It is used in the experiments to demonstrate that the proposed text segmentation algorithms together with exist-ing text recognition algorithms are suitable for indexing and retrieval of relevant video sequences in and from a video database. Our experimental results are very encouraging and suggest that these algorithms can be used in video retrieval applications as well as to recognize higher seman-tics in videos.
  • Martin Mauve, Volker Hilt, Christoph Kuhmünch und Wolfgang Effelsberg. , Technical Reports. 1998 A General Framework and Communication Protocol for the Real-Time Transmission of Interactive Media Mannheim, . 98-016
    In this paper we present a general framework for the real-time transmission ofinteractive media, i.e. media involving user interaction. Examples of interactive media are shared whiteboards, Java animations and VRML worlds. By identifying and supporting the common aspects of this media class the framework allows the development of generic services for network sessions involving the transmission of interactive media. Examples are mechanisms for late join and session recording. The proposed framework is based on the Real-Time Transport Protocol (RTP) which is widely used in the Internet for the real-time transmission of audio and video. Using the experience gained through the framework for audio and video, our work consists of three important parts: the definition of a protocol profile, the instantiation of this profile for specific media, and the development of generic services. The profile captures those aspects that are common to the class of interactive media. A single medium must instantiate this profile by providing media-specific information in the form of a payload type definition. Based on the profile, generic services can be developed for all interactive media. In this paper we focus on the description of the profile for the real-time transmission of interactive media. We then present the main ideas behind a generic recording service. Finally we show how multi-user VRML and distributed interactive Java animations can instantiate the profile.
  • Silvia Pfeiffer, Rainer Lienhart und Wolfgang Effelsberg. , Technical Reports. 1998 Scene Determination based on Video and Audio Features Mannheim, . 98-020
    Determination of scenes from a video is a challenging task. When asking humans for it, results will be inconsistent since the term scene is not precisely defined. It leaves it up to each human to set shared attributes which integrate shots to scenes. However, consistent results can be found for certain basic attributes like dialogs, same settings and continuing sounds. We have therefore developed a scene determination scheme which clusters shots based on detected dialogs, same settings and similar audio. Our experimental results show that automatic deter mination of these types of scenes can be performed reliably.

Buch Kapitel

[2018] [2017] [2016] [2015] [2014] [2013] [2012] [2011] [2010] [2009] [2008] [2007] [2006] [2005] [2004] [2003] [2002] [2001] [2000] [1999] 1998 [1997] [1996] [1995] [1994] [1993] [1992] [1991] [1990] [1988] [1987] [1986] [1985] [1984] [1983] [1981] [1980] [1979]