KAUST Grant NumberUS 2008-107
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AbstractRear-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.
CitationRhee J, Schulze J, DeFanti TA (2010) Hotspot mitigation in the StarCAVE. The Engineering Reality of Virtual Reality 2010. Available: http://dx.doi.org/10.1117/12.839135.
SponsorsI would like to thank Jurgen Schulze for advising me on the project, Tom DeFanti and Kaust for funding the project, Andrew Prudeholme for devising the hot spot position calculation method, Greg Dawe for figure 2 and CAD models of the cave, and Calit2 for providing me the opportunity to do this project. This publication is based in part on work supported by Award No. US 2008-107, made by King Abdullah University of Science and Technology (KAUST).
Conference/Event nameEngineering Reality of Virtual Reality 2010