Dynamic shadow removal from front projection displays

C. Jaynes, S. Webb, R. M. Steele, M. Brown, W. B. Seales

Research output: Contribution to conferencePaperpeer-review

50 Scopus citations


Front-projection display environments suffer from a fundamental problem: users and other objects in the environment can easily and inadvertently block projectors, creating shadows on the displayed image. We introduce a technique that detects and corrects transient shadows in a multi-projector display. Our approach is to minimize the difference between predicted (generated) and observed (camera) images by continuous modification of the projected image values for each display device. We are unaware of any other technique that directly addresses this problem. Furthermore, we speculate that the general predictive monitoring framework introduced here is capable of addressing more general radiometric consistency problems such as display-surface inter-reflections and the changes in display color and intensity due to projector bulb temperature variation. Using an automatically-derived relative position of cameras and projectors in the display environment and a straightforward color correction scheme, the system renders an expected image for each camera location. Cameras observe the displayed image, which is compared with the expected image to detect shadowed regions. These regions are transformed to the appropriate projector frames, where corresponding pixel values are increased. In display regions where more than one projector contributes to the image, shadow regions are eliminated. We demonstrate an implementation of the technique to remove shadows in a multi-projector front projection system.

Original languageEnglish
Number of pages8
StatePublished - 2001
EventVisualization 2001 - San Diego, CA, United States
Duration: Oct 21 2001Oct 26 2001


ConferenceVisualization 2001
Country/TerritoryUnited States
CitySan Diego, CA


  • Calibration
  • Immersive media
  • Large-scale display
  • Shadow removal

ASJC Scopus subject areas

  • General Computer Science
  • General Engineering


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