Techniques for reducing jitter for taps

Details Techniques for reducing jitter for taps Techniques for reducing jitter for taps

2011-04-26

2011-04-26

Eisen, Alexander (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

Reexamination Certificate

active

07932896

ABSTRACT:
Distinguishing sloppy taps from sliding motions is disclosed using an algorithm that can take into account both a time instability factor Tinst and a touch instability factor Zinst. A limited amount of motion per frame can be subtracted off immediately following the detection of a touch event. Small lateral motions indicative of a sloppy tap can be suppressed, while fast finger motions indicative of a quick, long cursor movement can immediately pass through the filter without being suppressed by a significant amount. A motion pass-through suppression factor can be applied subtractively to motion in particular direction as a function of Zinst and Tinst, wherein Zinst can represent a suppression value given as a finger speed for a particular percentage change in touch instability per frame, and Tinst can represent a suppression value given as finger speed for a particular tpress.

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