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bymultitouch - Multi-Touch Surfaces A Technical Guide...

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Multi-Touch Surfaces: A Technical Guide Technical Report TUM-I0833 Johannes Schöning ? , Peter Brandl, Florian Daiber, Florian Echtler, Otmar Hilliges, Jonathan Hook, Markus Löchtefeld, Nima Motamedi, Laurence Muller, Patrick Olivier, Tim Roth, Ulrich von Zadow ABSTRACT Multi-touch interaction with computationally enhanced sur- faces has received considerable recent attention. Approaches to the implementation of multi-touch interaction such as Frustrated Total Internal Reflection (FTIR) and Diffused Illumination (DI) have allowed for the low cost development of such surfaces, leading to a number of technology and ap- plication innovations. Although many of these techniques have been presented in an academic setting, the practicali- ties of building a high quality multi-touch enabled surface, both in terms of the software and hardware, are not trivial. This document aims to summarize the knowledge and ex- perience of developers of multi-touch technology who gath- ered at the Bootcamp on Construction & Implementation of Optical Multi-touch Surfaces at Tabletop 2008 in Ams- terdam, and seeks to provide hints and practical advice to people seeking to “build your own” multi-touch surface. We mostly focus on technical aspects that are important in the construction of optical multi-touch surfaces, including: infrared illumination, silicone compliant surfaces, projection screens, cameras, filters, and projectors. In addition, we out- line how to integrate this hardware to allow users to create a solid multi-touch surface, and provide an overview of exist- ing software libraries for the implementation of multi-touch applications. In addition, we discuss the problem of latency introduced by the different parts of the system. A brief description of most of the common technologies to realize (multi-) touch surfaces is provided; however, the main focus is on those that utilise optical approaches. Categories and Subject Descriptors B.0 [ Hardware General ]: Multi-Touch Surfaces Keywords Multi-touch surfaces, Hardware for multi-touch surfaces, Soft- ware libraries for multi-touch surfaces, Multi-touch boot- camp in conjunction with IEEE Tabletops 2008 ? Contact Address: Johannes Schöning, Institute for Geoinformatics University of Münster, Weseler Str. 253, 48151 Münster, Germany, [email protected] Technical Report TUM-I0833 Figure 1: The joy of multi-touch interaction. 1. INTRODUCTION Multi-touch technology is not entirely new, been available in different forms since the 1970s. Multiple patents [9, 23, 24, 28, 42] demonstrate how camera/sensor based touch sensi- tive surfaces can be constructed. Bill Buxton‘s multi-touch webpage [3] gives a thorough overview of the underlying technologies as well as the history of multi-touch surfaces and interaction. It also provides a list of “traps” that people starting out with multi-touch interaction should be aware of.
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