Computer Graphics Optique

Optical Superposition of Projected Computer Graphics
  • Aditi Majumder
  • Greg Welch
Part of the Eurographics book series (EUROGRAPH)


We present some ideas and demonstrations for a hybrid projector-based rendering and display technique we call Computer Graphics Optique. Instead of partially overlapping projected images to achieve a wide-area display, we completely overlap projected images on top of each other to achieve the addition of light and color in an “optical composition buffer.” The idea is to use the optical composition to replace some analytical computation, to increase rendering speed, gain flexibility, intensity range, and intensity resolution. Where projector-based displays are appropriate, potential uses include the optical realization of certain effects normally requiring a digital accumulation buffer, the optical composition of heterogeneous lighting techniques, and the ability to use heterogeneous graphics engines, in parallel. In addition one can make use of the optical projector control of focus augmented with the optical superposition to achieve effects that are otherwise computationally expensive. We believe that this technique offers the possibility of a new paradigm for combined rendering and projector-based display.


Computer Graphic Interactive Computer Graphic Call Computer Graphic Relative Radius Immersive Virtual Environment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    “Mercury: Realtime anti-aliasing 3d graphics sub-system,” Technical Report,, [cited Jan 2000].
  2. 2.
    Rui Bastos. Superposition Rendering: Increased Realism for Interactive Walkthroughs. PhD thesis, University of North Carolina at Chapel Hill, Department of Computer Science, 1999.Google Scholar
  3. 3.
    R.A. Chorley and J. Laylock, “Human factor consideration for the interface between electro-optical display and the human visual system,” In Displays, volume 4, 1981.Google Scholar
  4. 4.
    Carolina Cruz-Neira, Daniel J. Sandin, and Thomas A.Defanti, “Surround-screen projection-based virtual reality: The design and implementation of the cave,” In Proceedings of ACM Siggraph, 1993.Google Scholar
  5. 5.
    “Flash: Graphics System and Architecture,”Department of Computer Science, Stanford University, [cited on Jan 2001] Available from
  6. 6.
    White Pages of Color Vision,, [cited Jan 2001].
  7. 7.
    P. Diefenbach and N. Badler, “Pipeline rendering: Interactive refractions, reflections and shadows,” In Displays(Special Issue on Interactive Computer Graphics), 1994.Google Scholar
  8. 8.
    J.D. Foley, A. Van Dam, S.K. Feiner, and J.F.Hughes, Computer Graphics Principles and Practice. Addison Wesley, 1990.Google Scholar
  9. 9.
    Paul E. Haeberli and Kurt Akeley, “The accumulation buffer: Hardware support for high-quality rendering,” Computer Graphics (Proceedings of SIGGRAPH 90), 24(4):309–318, August 1990.CrossRefGoogle Scholar
  10. 10.
    G. Humphreys and P. Hanrahan, “A distributed graphics system for large tiled displays,” In Proceedings of IEEE Visualization, 1999.Google Scholar
  11. 11.
    Aditi Majumder, Zue He, Herman Towles, and Greg Welch. “Achieving Color Uniformity Across Multi-Projector Displays,” In Proceedings of Visualization, 2000.Google Scholar
  12. 12.
    Thomas L. Martzall, “Simultaneous raster and calligraphic crt projection system for flight simulation,” In SPIE Proceedings, Electroluminescent Materials, Devices, and Large-Screen Displays, volume 1910, 01/31/1993–02/05/1993.Google Scholar
  13. 13.
    R. Raskar, G. Welch, M. Cutts, A. Lake, L. Stesin, and H. Fuchs, “The office of the future: A unified approach to image based modeling and spatially immersive display,” In Proceedings of ACM Siggraph, pages 168–176, 1998.Google Scholar
  14. 14.
    Ramesh Raskar, “Immersive planar displays using roughly aligned projectors.” In Proceedings of IEEE Virtual Reality 2000, 1999.Google Scholar
  15. 15.
    Samanta Rudro, Jiannan Zheng, Thomas Funkhouse, Kai Li, and Jaswinder Pal Singh, “Load balancing for multi-projector rendering systems,” In Workshop on Graphics Hardware, August 1999.Google Scholar
  16. 16.
    S.Molnar, J. Eyles, and J. Poulton, “Pixelflow: High-speed rendering using image composition,” In Proceedings of SIGGPARH, pages 231–240, 1992.Google Scholar
  17. 17.
    M. Lacroix, “A HDTV Projector for Wide Field of View Flight Simulators,” Presented at IMAGE VI Conference, Scottsdale, AZ, July 14–17, 1992.Google Scholar
  18. 18.
    K. Talmi, J. Liu, “Eye and Gaze Tracking for Visually Controlled Interactive Stereoscopic Displays,” Proceedings of Image Communication, 1998.Google Scholar

Copyright information

© Springer-Verlag Wien 2001

Authors and Affiliations

  • Aditi Majumder
    • 1
  • Greg Welch
    • 1
  1. 1.Department of Computer ScienceUniversity of North CarolinaChapel HillUSA

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