Geometrically Correct Imagery for Teleconferencing

Ruigang Yang, Michael S. Brown, W. Brent Seales, Henry Fuchs

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Current camera-monitor teleconferencing applications produce unrealistic imagery and break any sense of presence for the participants. Other capture/display technologies can be used to provide more compelling teleconferencing. However, complex geometries in capture/display systems make producing geometrically correct imagery difficult. It is usually impractical to detect, model and compensate for all effects introduced by the capture/display system. Most applications simply ignore these issues and rely on the user acceptance of the camera-monitor paradigm. This paper presents a new and simple technique for producing geometrically correct imagery for teleconferencing environments. The necessary image transformations are derived by finding a mapping between a capture and display device for a fixed viewer location. The capture/display relationship is computed directly in device coordinates and completely avoids the need for any intermediate, complex representations of screen geometry, capture and display distortions, and viewer location. We describe our approach and demonstrate it via several prototype implementations that operate in real-time and provide a substantially more compelling sense of presence than the standard teleconferencing paradigm.

Original languageEnglish
Title of host publicationMULTIMEDIA 1999 - Proceedings of the 7th ACM International Conference on Multimedia (Part 1)
Number of pages8
ISBN (Electronic)9781581131512
StatePublished - 1999
Event7th ACM International Conference on Multimedia (Part 1), MULTIMEDIA 1999 - Orlando, United States
Duration: Oct 30 1999Nov 5 1999

Publication series

NameMULTIMEDIA 1999 - Proceedings of the 7th ACM International Conference on Multimedia (Part 1)


Conference7th ACM International Conference on Multimedia (Part 1), MULTIMEDIA 1999
Country/TerritoryUnited States

Bibliographical note

Funding Information:
This work is supported by the National Science Foundation cooperative agreement AX-8920219: “Science and Technology Center for Computer Graphics and Scientific Visualization”, the “National Tele-lmmersion Initiative” sponsored by Advanced Networks and Services, Link Foundation, and Intel Corporation. We would like to thank Ramesh Raskar for’ proposing use of the UNC Camera-Cluster use in a very-wide-field-of-view teleconferencing environment. We also gratefully acknowledge John Thomas, Jim Mahaney and David Harrison in the design and assembly of our test environment. We give special thanks to Herman Towles for useful discussions of implementation, hardware layout, and overall motivation.

Publisher Copyright:
© 1999 ACM.


  • Teleconference
  • graphics
  • immersive display
  • real-time
  • telepresence
  • video conference

ASJC Scopus subject areas

  • Computer Graphics and Computer-Aided Design
  • Human-Computer Interaction
  • Software


Dive into the research topics of 'Geometrically Correct Imagery for Teleconferencing'. Together they form a unique fingerprint.

Cite this