Title:	TWIST – A SCALABLE TECHNIQUE FOR TOUCH AND TOUCHLESS INTERACTION
Author(s):	Daniel Steffen, Didier Stricker
ISBN:	978-972-8939-75-5
Editors:	Katherine Blashki
Year:	2012
Edition:	Single
Keywords:	Multi-touch, Bi-manual interaction, Gesture interfaces, 3-D Depth camera, Mobile device interaction
Type:	Short Paper
First Page:	274
Last Page:	278
Language:	English
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Paper Abstract:	Multi-touch interaction with small devices as well as touchless interaction has received much attention in recent years. Mobile touch devices (e.g. tablet computers and smart phones) allow users to interact directly with what is displayed on a screen. Modern gesture recognition systems using 3-D depth cameras (e.g. Microsoft’s Kinect™) enable users to control and interact with large screens without the need of touching. Both interaction techniques, however, suffer from the limitations of the human physiology and/or the resolution of the employed input device. When selecting a small area on a touch device the minimal selection distance is determined by the size of the user’s finger tips. In the case of using a 3-D depth camera as input device the resolution of the camera is the limiting factor e.g. if the user's hands are close together or his distance to the camera is too large the body parts are indistinguishable. We address the problem by introducing a new gesture which scales for touch and touchless interaction devices. We present a solution how to overcome the limited input resolution of a device (e.g. camera or multi-touch device) for a one-dimensional scaling technique by using a new gesture called Twist. Instead of bringing the fingers / hands closer to each other the user simply twists them at a given distance. Finally, we illustrate shortly two scenarios that benefit from using the Twist gesture.
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