Selected Readings in Vision and Graphics
edited by Luc Van Gool, Gábor Székely, Markus Gross, Bernt Schiele

Volume 29

Edouard Lamboray,
A Communication Architecture for
Telepresence in Virtual Environments

First edition 2004, 184 pages, € 64,00. ISBN 3-89649-948-3

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 free-viewpoint video.
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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