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Sebastian Boring, Dominikus Baur, Andreas Butz, Sean Gustafson, Patrick Baudisch
Touch Projector: Mobile Interaction Through Video
In Proceedings of the 28th ACM International Conference on Human Factors in Computing Systems - CHI 2010, Atlanta, Georgia, USA, Apr. 2010 (bib)

In 1992, Tani et al. proposed operating machines in a factory remotely by manipulating a live video image on a computer screen. In this paper we revisit this metaphor and investigate its suitability for mobile use in reconfigurable multi-display environments. We present Touch Projector, a system that enables users to interact with remote screens through a live video image on their mobile device. Touch Projector tracks itself with respect to the surrounding displays. Interaction with the video image is projected onto the target display. A literal adaptation of Tani's idea, however, fails because handheld video does not offer enough stability and control to enable precise manipulation. We address this with a series of improvements, including zooming and freezing the video image. In a user study, participants selected targets and dragged targets between displays using the literal and three improved versions. We found that par-ticipants achieved highest performance with automatic zooming and temporary image freezing.