This paper discusses two efficient methods for image based rendering. Both algorithms approximate the world object. One uses the convex hull and the other uses the visual hull. We show that the overhead of using the latter is not always justified and in some cases, might even hurt. We demonstrate the method on real images from a studio-like setting in which many cameras are used, after a simple calibration procedure. The novelties of this paper include showing that projective calibration suffices for this computation and providing simpler formulation that is base only on image measurements.
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