This new double-sided multi-touch mobile interaction model enables intuitive finger gestures for manipulating 3D objects and user interfaces on a 2D screen. Although multi-touch input enables scrolling and the zooming of a document, its manipulation is constrained to two dimensions over the horizontal or vertical planes of a mobile device’s 2D touch screen. By adding touch inputs from the device’s back side, the degree of freedom for manipulation can be extended to a pseudo three dimensions.
| Grabbing an object. | Dragging an object (x and y axes) by simultaneously moving fingers on both sides of the device. |
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| Pushing up/down on an object by touching on the object from back/front side of the device. | Flipping an object by grabbing and sliding two fingers in opposite directions. |
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| Stretching an object by grabbing it with two pairs of fingers and sliding those two in different directions. | |
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Source: E.E. Shen, S.D. Tsai, H. Chu, Y.J. Hsu, and C.E. Chen, “Double-side multi-touch input for mobile devices,” Proceedings of the 27th international conference extended abstracts on Human factors in computing systems, Boston, MA, USA: ACM, 2009, pp. 4339-4344. (Poster in PDF format is available at NTU Ubicomp Laboratory)
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