Catadioptric Projectors

Abstract
         We introduce a catadioptric projector design analogous to a catadioptric camera by combining a commodity digital projector with additional optical units. We show that by using specially shaped reflectors/refractors, catadioptric projectors can offer an unprecedented level of flexibility in aspect ratio, size, and field-of-view. We also present efficient algorithms to reduce projection artifacts such as distortions, scattering, and defocusing. Instead of recovering the reflector/refractor geometry, we model the light transport between the projector and the viewpoint using the light transport matrix (LTM). We use an efficient approximation of the pseudo inverse of the LTM for finding the optimal input image that produces least projection distortions.

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