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In Augmented Reality (AR) real imagery is superimposed by computer graphics renderings of virtual objects. This paper addresses the problem of creating the illusion that the virtual objects cast credible shadows in the real scenario. A step towards this is to be able to detect shadow regions in images of natural scenes, and this paper describes art approach to such shadow detection. The shadow detection can distinguish between directly lit areas, penumbra (hall-shadow) areas, and umbra (full shadow) areas. Furthermore, it is demonstrated how virtual shadows can be created which appear very similar to the real shadows.

Using Real Shadows to Create Virtual Ones