Precise selection techniques for multi-touch screens

The size of human fingers and the lack of sensing precision can make precise touch screen interactions difficult. We present a set of five techniques, called Dual Finger Selections, which leverage the recent development of multitouch sensitive displays to help users select very small targets. These techniques facilitate pixel-accurate targeting by adjusting the control-display ratio with a secondary finger while the primary finger controls the movement of the cursor. We also contribute a "clicking" technique, called SimPress, which reduces motion errors during clicking and allows us to simulate a hover state on devices unable to sense proximity. We implemented our techniques on a multi-touch tabletop prototype that offers computer visionbased tracking. In our formal user study, we tested the performance of our three most promising techniques (Stretch, X-Menu, and Slider) against our baseline (Offset), on four target sizes and three input noise levels. All three chosen techni...

• Type: Conference
• Year: 2006
• Where: CHI
• Authors: Hrvoje Benko, Andrew D. Wilson, Patrick Baudisch
• Keywords: CHI 2006, Dual Finger Selections, Human Computer Interaction, Interaction Techniques, Multi-touch Tabletop Prototype