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Camera-based detection and removal of shadows from interactive multiprojector displays.

Christopher Jaynes1, Stephen Webb, R Matt Steele

  • 1Department of Computer Science, University of Kentucky, Lexington, KY 40506, USa. jaynes@uky.edu

IEEE Transactions on Visualization and Computer Graphics
|June 27, 2008
PubMed
Summary

Shadows in front-projection displays are fixed using a new technique. Cameras detect shadows, and the system adjusts projector output to eliminate them, enhancing immersive visualization.

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Area of Science:

  • Computer Graphics
  • Human-Computer Interaction
  • Display Technology

Background:

  • Front-projection displays offer cost-effective, large-format visualization and immersive virtual model rendering.
  • Advances in projector tiling, calibration, and color balancing enable feasible multiprojector systems.
  • These systems create seamless, immersive virtual reality and visualization experiences with manageable cost and maintenance.

Purpose of the Study:

  • To introduce a novel technique for real-time shadow detection and correction in multiprojector front-projection displays.
  • To address the issue of occlusions caused by users or objects blocking projectors, which create distracting shadows.

Main Methods:

  • Employing cameras to observe the display and compare real-time images with an expected image to identify shadowed areas.

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  • Transforming detected shadow regions to corresponding projector frames for adjustment.
  • Increasing and/or attenuating pixel values within shadowed regions to compensate for occlusion.

    • Main Results:

    • Successfully detected and corrected shadows in active multiprojector display systems.
    • Eliminated shadow regions in areas where multiple projectors contribute to the image.
    • Restored visual integrity and enhanced the immersive experience by removing occlusions.

    Conclusions:

    • The developed technique effectively mitigates shadow artifacts in front-projection displays during operation.
    • This method significantly improves the quality and usability of immersive visualization systems.
    • Real-time shadow correction offers a practical solution for maintaining visual presence in virtual environments.