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Making Graphical Information Visible in Real Shadows on Interactive Tabletops

We introduce a shadow-based interface for interactive tabletops. The proposed interface allows a user to browse graphical information by casting the shadow of his/her body, such as a hand, on a tabletop surface. Central to our technique is a new optical design that utilizes polarization in addition to the additive nature of light so that the desired graphical information is displayed only in a shadow area on a tabletop surface. In other words, our technique conceals the graphical information on surfaces other than the shadow area, such as the surface of the occluder and non-shadow areas on the tabletop surface. We combine the proposed shadow-based interface with a multi-touch detection technique to realize a novel interaction technique for interactive tabletops. We implemented a prototype system and conducted two proof-of-concept experiments along with a quantitative evaluation to assess the feasibility of the proposed optical design. Finally, we showed several implemented application systems of the proposed shadow-based interface.

Publications

  • Mariko Isogawa, Daisuke Iwai, and Kosuke Sato, "Making Graphical Information Visible in Real Shadows on Interactive Tabletops," IEEE Transactions on Visualization and Computer Graphics, Vol. 20, No. 9, pp. 1293-1302, 2014. [pdf]
  • Mariko Miki, Daisuke Iwai, and Kosuke Sato, "Optically Hiding of Information with Polarized Complementary Projection," In Proceedings of International Conference on Artificial Reality and Telexistence (ICAT), p.166, 2011. [pdf]
  • Mariko Miki, Daisuke Iwai, and Kosuke Sato, "Optically Hiding of Tabletop Information with Polarized Complementary Image Projection - Your Shadow Reveals It!," In Proceedings of ACM International Conference on Interactive Tabletops and Surfaces (ITS), pp.260-261, 2011. [pdf]