Publications of Wolfgang Effelsberg

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Artikel

Konferenz Beitrag

Forschungs Papier

  • Ralf Keller, Bernd Lamparter und Wolfgang Effelsberg. , Technical Reports. 1992 Erweiterung von X für digitale Filme Mannheim, . 92-006
    In dieser Arbeit wird eine Erweiterung von X11 für die Bewegtbilddarstellung in einer verteilten Umgebung vorgestellt. Sie ermöglicht den benutzerkontrollierten Ablauf von Filmen in Fenstern, die von X zur Verfügung gestellt werden. Nach einer Einführung in die Problematik der Bewegtbilddarstellung und -übertragung wird die Erweiterung des X-Window-Systems detailliert beschrieben. Der Schwerpunkt liegt dabei auf der Funktionalität der Benutzerschnittstelle und der Verarbeitung von Filmaufträgen im X-Server. Ausserdem werden verschiedene Leistungsmessungen präsentiert, die zur Engpassanalyse des Systems durchgeführt wurden.
  • Bernd Lamparter und Wolfgang Effelsberg. , Technical Reports. 1992 X-MOVIE: Transmission and Presentation of Digital Movies under X Mannheim, . 92-004
    We describe a system for storing, transmitting and presenting digital films in a computer network. The hardware used in the system is standard hardware, as found in typical workstations today; no special hardware is required. The movies are shown in a window of the X Window System. This allows full integration with the classical components of computer applications such as text, color graphics, menues and icons. The X-MOVIE system is based on color lookup table technology. We present a new algorithm for the gradual adaptation of the color lookup table during the presentation of the film.
  • Bernd Lamparter, Wolfgang Effelsberg und Norman Michl. , Technical Reports. 1992 MTP: A Movie Transmission Protocol for Multimedia Applications Mannheim, . 92-005
    Typical color video adapters of today's PCs and workstationsuse 8 bits per pixel as an index into the color lookup table (CLUT). Full color pictures and movies have to be reduced to 256 colors. In order to avoid false colors between two frames of a digital movie, a novel technique for computing the CLUT's is proposed: A subset of the CLUT entries is reserved for new colors of the next frame. The paper presents an algorithm for the gradual adaption of the color lookup table during the transmission of a movie. First experience is reported in the framework of the XMovie project.
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