Detecting Multitouch Events in an Optical Touch-Sensitive Device Using Touch Event Templates

摘要

An optical touch-sensitive device is able to determine the locations of multiple simultaneous touch events. The optical touch-sensitive device includes multiple emitters and detectors. Each emitter produces optical beams which are received by the detectors. Touch events disturb the optical beams. Touch event templates are used to determine the actual touch events based on which optical beams have been disturbed.

主权项

1. A method for determining simultaneous touch events on a surface, the surface having emitters and detectors arranged around its periphery, the emitters producing optical beams received by the detectors, the touch events disturbing the optical beam, the method comprising:
determining, a priori, a set of touch event templates for a group of expected touch events, each touch event template for an expected touch event defined by at least two beams that would be disturbed by the expected touch event; receiving information indicating which beams have been disturbed by actual touch events; and comparing the received information to the touch event templates, to determine the actual touch events.