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Mega Irises: Per-Pixel Projection Illumination Compensation for the moving participant in projector-based visual system  

Jin, Jong-Wook (Department of Computer Science VR Lab., KAIST)
Wohn, Kwang-Yun (Department of Computer Science VR Lab., KAIST)
Publication Information
Journal of the Korea Computer Graphics Society / v.17, no.4, 2011 , pp. 31-40 More about this Journal
Abstract
Projector-based visual systems are widely used for VR and experience display applications. But the illumination irregularity on the screen surface due to the screen material and its light reflection properties sometimes deteriorates the user experience. This phenomenon is particularly troublesome when the participants of the head tracking VR system such as CAVE or the motion generation experience system continually move around the system. One of reason to illumination irregularity is projector-screen specular reflection component to participant's eye's position and it's analysis needs high computation complexity. Similar to calculate specular lighting term using GPU's programmable shader, Our research adjusts every pixel's brightness in runtime with given 3D screen space model to reduce illumination irregularity. For doing that, Angle-based brightness compensate function are considered for specific screen installation and modified it for GPU-friendly compute and access. Two aspects are implemented, One is function access transformation from angular form to product and the other is piecewise linear interpolate approximation.
Keywords
Luminace compensation; Lighting Reflection; GPU; VR and Experience Display;
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