Tap2Count: numerical input for interactive tabletops

We present a technique to enter numbers on interactive multi-touch tabletops using the 10 fingers of both hands. We recognize the number of fingers simultaneously touching the screen and interpret them as digits from 0 to 9 to represent any number in the decimal system. Our technique works independent from the location and orientation of users at the tabletop and does not occlude screen space, rendering it an interesting alternative to commonly used techniques for numerical input on touchscreens, such as virtual keyboards and handwriting recognition systems.

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