PhD Student
Screen+Shot+2017-02-08+at+5.44.36+PM.png

Bitey

Bitey: An Exploration of Tooth Click Gestures for User Interface Control

Abstract

We present Bitey, a subtle, wearable device for enabling input via tooth clicks. Based on a bone-conduction microphone worn just above the ears, Bitey recognizes the click sounds from up to five different pairs of teeth, allowing fully hands- free interface control. We explore the space of tooth input and show that Bitey allows for a high degree of accuracy in distinguishing between different tooth clicks, with up to 94% accuracy under laboratory conditions for five different tooth pairs. Finally, we illustrate Bitey’s potential through two demonstration applications: a list navigation and selection interface and a keyboard input method.

 
occlusions

Teeth Occlussions

The first and third row of images show gnathosonograms produced by tooth clicks (x-axis seconds) while the second and forth row illustrate the corresponding normalized FFTs (x-axis Hz). Images on the left present single clicks while images on the right illustrate multiple clicks overlaid.

bitewrite

BiteWrite

To explore the limits of what Bitey can accomplish, we implemented BiteWrite, a tooth-click based text input system. We used a version of MacKenzie’s H4-Writer, using Huffman codes to assign minimal click sequences to generate letters. For example, two clicks—represented as 0 and 1—generate sequences such as ‘010’ for ‘e’ and ‘011001’ for ‘g’. For a participant able to click N pairs of teeth, we implemented the N − 1-click version of the keyboard, with theNth click used as “cancel” (in the case of a partially entered sequence) or “backspace” (otherwise).

Full Citation

Daniel Ashbrook, Carlos E. Tejada, Dhwanit Mehta, Anthony Jiminez, Goudam Muralitharam, Sangeeta Gajendra, Ross Tallents. Bitey: An Exploration of Tooth Click Gestures for Hands-Free User Interface Control. In ACM 18th International Conference on Human-Computer Interaction with Mobile Devices and Services (Mobile- HCI), Florence, Italy, 2016, 12 pages (23.9% acceptance rate).