BackTap: robust four-point tapping on the back of an off-the-shelf smartphone

@inproceedings{Zhang2013BackTapRF,
  title={BackTap: robust four-point tapping on the back of an off-the-shelf smartphone},
  author={Cheng Zhang and Aman Parnami and Caleb Southern and Edison Thomaz and Gabriel Reyes and Rosa I. Arriaga and Gregory D. Abowd},
  booktitle={UIST},
  year={2013}
}
We present BackTap, an interaction technique that extends the input modality of a smartphone to add four distinct tap locations on the back case of a smartphone. The BackTap interaction can be used eyes-free with the phone in a user's pocket, purse, or armband while walking, or while holding the phone with two hands so as not to occlude the screen with the fingers. We employ three common built-in sensors on the smartphone (microphone, gyroscope, and accelerometer) and feature a lightweight… CONTINUE READING
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