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technical statement The computer, a standard PC at 800+ MHz running a common 3D accelerated video card, samples from a digital camera and synthesizes images in real-time which interact with the shadow. When latency is unimportant (eg: "Butterflies") relatively cheap USB web-cameras are used; in other cases (eg: Sand) DV cameras over IEEE 1394 are used to minimize latency. The projectors use LCD technology in place of DLP to minimize temporal aliasing between the camera and the screen caused by the image flicker due to the DLP color wheels. Calibration between the camera's point of view and the projector's is achieved by a sampling method which permits non-affine (eg: around corners) mapping. |
