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Communications of the ACM - Special issue on computer augmented environments: back to the real world
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Projector-based augmented reality techniques are expected to become a practical display solution for hand-held devices in the near future. A new problem in the new environment is that neither a projector nor a projection surface is fixed in space . This means that calibration between the two coordinate systems of a projector and a camera will have to be no more a one-time setup procedure but a dynamic process. The best solution will be to remove the need for calibration from the beginning by having a projector and a camera share the same lens system. The iProCam is a projector-camera system that realized this idea using a beam splitter and a time-multiplexing scheme. Sharing the same lens system also makes it possible to keep a projector in focus by keeping a camera in focus. This paper presents the implementation details of an iProCam prototype and the results of experiments conducted to verify the concept.