Patent ID: 8723839
Filing Date: 2014-05-13
Classification: G06F

Abstract:
1. A method for determining a touch event on a touch-sensitive optical device comprising a plurality of optical emitters and a plurality of optical detectors, the optical emitters and the optical detectors defining therebetween a plurality of optical beam paths forming an optical beam intersection pattern extending over an area, the method comprising the steps of: detecting a plurality of modulations of energy in beams transmitted along each of a plurality of pairs of optical beam paths; assigning a plurality of candidate touch points at a plurality of intersections of the pairs of modulated beams, where the candidate touch point at each intersection corresponds to a different pair of modulated beams, and at least two of the intersections have different locations from each other; analyzing predetermined other beams near to or coincident with the beams of said candidate touch points; responsive to said analyses, determining whether each candidate touch point is an actual touch point; and grouping the actual touch points into a cluster based on a search radius distance from a cluster member to at least one other member of the cluster; and determining the touch event based on the actual touch points in the cluster.