GripSense: Using Built-in Sensors to Detect Hand Posture and Pressure on Commodity Mobile Phones

摘要

We introduce GripSense, a system that leverages mobile device touchscreens and their built-in inertial sensors and vibration motor to infer hand postures including one- or two-handed interaction, use of thumb or index finger, or use on a table. GripSense also senses the amount of pressure a user exerts on the touchscreen despite a lack of direct pressure sensors by observing diminished gyroscope readings when the vibration motor is 'pulsed.' In a controlled study with 10 participants, GripSense accurately differentiated device usage on a table V5. in hand with 99.7% accuracy; when in hand, it inferred hand postures with 84.3% accuracy. In addition, GripSense distinguished three levels of pressure with 95.1% accuracy. A usability analysis of GripSense was conducted in three custom applications and showed that pressure input and hand-posture sensing can be useful in a number of scenarios.