Multi-user interaction with shadows

  • Authors:

  • Tomomi Gotoh;Takahiro Kida;Munehiro Takimoto;Yasushi Kambayashi

  • Affiliations:

  • Department of Information Sciences, Tokyo University of Science, Japan;Department of Information Sciences, Tokyo University of Science, Japan;Department of Information Sciences, Tokyo University of Science, Japan;Department of Computer and Information Engineering, Nippon Institute of Technology, Japan

  • Venue:
  • HCI'13 Proceedings of the 15th international conference on Human-Computer Interaction: interaction modalities and techniques - Volume Part IV
  • Year:
  • 2013

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Abstract

Recent mobile devices such as smart phones exhibit performance as good as desktop PCs, and can be used more intuitively than PCs by using fingers. On the other hand, the defect of such a device is its small size. Its display is just big enough for single user, but is too small for interaction of multi-users. In order to overcome the defect, the research of projecting the display with a handheld projector has expanded. Most of the researches, however, do not allow users to manipulate the projected image in a direct manner. In this paper, we propose operations of projected images through shadows. We can create a shadow by shading the light of the projector with a finger. The shadow can be easily scaled by adjusting the distance between the finger and the projector. Also, since the shadow makes good contrast with the white light of the projector, it can be easily recognized through a camera. Using these properties of the shadow, we have implemented a series of operations required on the desktop, and file transfer as a basic multi-users interaction. We show that the users can perform these operations intuitively with the shadow of two fingertips as if they handle a tablet PC through multi-touches.