Inh.: Dr. Renate Gorre
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Selected Readings in Vision and Graphics
edited by Luc Van Gool, Gábor Székely, Markus Gross, Bernt Schiele
A Communication Architecture
for Telepresence in
edition 2004, 184 pages, €
In this thesis, we describe
the communication architecture of the blue-c, a novel platform for
tele-immersive collaborative applications enhanced by 3D video conferencing
features. The blue-c communication layer builds on CORBA, an open standard for
distributed object computing, and deals with common networking services and
real-time multimedia streaming and coding of geometry and appearance data for
First, we analyze data streams in the context of virtual environments for telepresence. In the design of our communication architecture, we follow an attribute-centric approach and discuss the consequences thereof for application data updates. Moreover, we review architectures for real-time free-viewpoint video pipelines and derive theoretical bounds on the minimal system latency as a function of the transmission and processing delays.
The coding of geometry-enhanced free-viewpoint video is first discussed for 3D video recording systems. We propose an object-space 3D video coding scheme using a hierarchical point data structure and an image-space coding framework for 3D video data.Our real-time 3D video pipeline for distributed acquisition, processing and rendering is based on a differential updating scheme and allows to transmit a 3D video stream at 10 frames per second with a mean bit rate between 1.5 and 2.5 megabit per second. Finally, we demonstrate the communication and networking features of the blue-c system in its full deployment.
About the author:
Edouard Lamboray was a PhD student at the Computer Graphics Laboratory at ETH Zurich, Switzerland. He received a degree in communication systems engineering from the Swiss Federal Institute of Technology in Lausanne (EPFL) and from the Eurecom Institute in Sophia-Antipolis, France. His research interests include networking and coding aspects of free-viewpoint video and of collaborative distributed virtual environments.
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