Enabling a gesture-based numeric input on mobile phones

We designed a gesture-based numeric input scheme using a mobile phone equipped with an acceleration sensor. In the suggested scheme, users could key in numbers with a gesture input, instead of a traditional numeric keypad input. The numeric codes are expressed in certain series of gestures with a mobile phone, including tapping, flipping, and shaking. The scheme developed in this study is an activity-recognition-based system by which gestures are categorized through a pre-processing and a probabilistic inference model we developed. The people with visual disabilities who cannot see the screen can take advantage of the proposed scheme to enter numeric codes on most of currently available touch-based smart phones.