Interaction with virtual shadow through real shadow using two projectors

In this paper, we propose a method to interact with virtual shadows through real shadows various physical objects by using two projectors. In our method, the system scans physical objects in front of a projector, generates virtual shadows with CG according to the scan data, and superimposes the virtual shadows to real shadows of the physical objects with the projector. Another projector is used to superimpose virtual light sources inside real shadows. Our method enables us to experience novel interaction with various shadows such as shadows of flower arrangements.