Article | Proceedings of SIGRAD 2011. Evaluations of Graphics and Visualization — Efficiency; Usefulness; Accessibility; Usability; November 17-18; 2011; KTH; Stockholm; Sweden | Multi-State Device Tracking for Tangible Tabletops

Title:
Multi-State Device Tracking for Tangible Tabletops
Author:
Ali Alavi: t2i Lab, Chalmers, Sweden Brice Clocher: t2i Lab, Chalmers, Sweden Allen Smith: t2i Lab, Chalmers, Sweden Andreas Kunz: ICVR, ETH, Switzerland Morten Fjeld: t2i Lab, Chalmers, Sweden
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Full text (pdf)
Year:
2011
Conference:
Proceedings of SIGRAD 2011. Evaluations of Graphics and Visualization — Efficiency; Usefulness; Accessibility; Usability; November 17-18; 2011; KTH; Stockholm; Sweden
Issue:
065
Article no.:
014
Pages:
99-103
No. of pages:
5
Publication type:
Abstract and Fulltext
Published:
2011-11-21
ISBN:
978-91-7393-008-6
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press; Linköpings universitet


On tangible tabletops; Tangible User Interfaces (TUIs) can signalize their identity; position; orientation; and state by active infrared light. This provides rich interaction capabilities in complex; dynamic scenarios. If TUIs have to transfer additional high-resolution information; many bits are required for each update. This has a negative impact on the overall update rate of the system. In the first part of this paper; we present an in-house map application where interaction with time-dependent contour lines may benefit from high-resolution TUI states. Prototypical TUI concepts such as slider; ruler; and dials further motivate the benefit of high-resolution tracking. In the second part of the paper; we depart from a device tracking overview and then show how tangible devices for tabletops typically use infrared (IR) emitters and a camera to send information about their position; orientation; and state. Since transferring many additional information bits via a normal camera-based tabletop system is not feasible anymore; we introduce next a new system setup that still offers a sufficiently high update rate for a smooth interaction. The new method can be realized as a tabletop system using a low-cost camera detecting position; combined with a low-cost infrared receiver detecting the state of each device. Since both kinds of sensors are used simultaneously we call the method “dual mode.” This method combines a camera-based tracking with the possibility to transfer an almost unlimited amount of states for each device.

Keywords: Active tangible devices; tabletop; dual mode; IR tracking; multiple TUI

Proceedings of SIGRAD 2011. Evaluations of Graphics and Visualization — Efficiency; Usefulness; Accessibility; Usability; November 17-18; 2011; KTH; Stockholm; Sweden

Author:
Ali Alavi, Brice Clocher, Allen Smith, Andreas Kunz, Morten Fjeld
Title:
Multi-State Device Tracking for Tangible Tabletops
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Proceedings of SIGRAD 2011. Evaluations of Graphics and Visualization — Efficiency; Usefulness; Accessibility; Usability; November 17-18; 2011; KTH; Stockholm; Sweden

Author:
Ali Alavi, Brice Clocher, Allen Smith, Andreas Kunz, Morten Fjeld
Title:
Multi-State Device Tracking for Tangible Tabletops
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