Results
Looking first at single finger touches, performance using all
8 seconds of training data yielded an all-pairs average accuracy
of 97.3% (SD=5.9%). Figure 4 illustrates the classification
performance with different volumes of training data,
varying from 0.1 second (1 training sample per participant)
to 8 seconds (80 training samples per participant). Performance
significantly plateaus after 0.5 seconds of training
data (5 training sample per participant), which achieves
96.4% accuracy (SD=9.0%). Figure 5 shows classification
accuracies for all user pairings. Of note, two thirds of pairings
had 100% differentiation accuracy.