Hotspot mitigation in the StarCAVE

Jordan Rhee, Jurgen Schulze, Thomas A. DeFanti

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Rear-projected screens such as those in Digital Light Projection (DLP) televisions suffer from an image quality problem called hot spotting, where the image is brightest at a point dependent on the viewing angle. In rear-projected mulit-screen configurations such as the StarCAVE at Calit2, this causes discontinuities in brightness at the edges where screens meet, and thus in the 3D image perceived by the user. In the StarCAVE we know the viewer's position in 3D space and we have programmable graphics hardware, so we can mitigate this effect by performing post-processing in the inverse of the pattern, yielding a homogenous image at the output. Our implementation improves brightness homogeneity by a factor of 4 while decreasing frame rate by only 1-3 fps.
Original languageEnglish (US)
Title of host publicationThe Engineering Reality of Virtual Reality 2010
PublisherSPIE-Intl Soc Optical Eng
ISBN (Print)9780819479181
StatePublished - Jan 27 2010
Externally publishedYes


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