CONTRIBUTION
The salient distinguishing feature of our user differentiation
approach is that it allows direct touch interaction without
requiring instrumentation of either the user or environment
– sensing electronics are fully contained within the device.
This important property sets it apart from all previous techniques.
Further, our technology is sufficiently compact,
low-powered and inexpensive to enable integration into
mobile devices and allow for truly mobile interactions. Additionally,
user classification occurs in real time; the initial
“first-touch” calibration takes less than a second. Finally,
our approach is not sensitive to occlusion, orientation, lighting,
or other factors that are problematic for computer vision
driven methods.