Patent ID: 8350831

Claim:
A method for determining a touch point 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 modulation of energy in beams transmitted along each of a pair of optical beam paths; assigning a candidate touch point at the intersection of said pair of modulated beams; accessing stored data from a database defining predetermined other beams or predetermined other beam intersections near to or coincident with said candidate touch point, wherein the stored data includes respective weighting and/or proximity values relating to the predetermined other beams or predetermined other beam intersections; analyzing said predetermined other beams based at least in part on said stored data; and responsive to said analysis, determining whether the candidate touch point is an actual touch point.