Patent ID: 7256772
Filing Date: 2007-08-14
Classification: G06F

Abstract:
1. In a touch system having a touch screen with a touch surface on which an image is displayed, a method of automatically mapping the touch screen co-ordinate system to the display co-ordinate system comprising the steps of: including in said displayed image at least one reference mark, the location of the at least one reference mark in said display co-ordinate system being known; acquiring an image of said touch surface including said displayed image; recognizing the at least one reference mark in said acquired image by comparing the acquired image with reference marks stored in a reference mark library; determining the location of said recognized at least one reference mark in said acquired image relative to said touch screen co-ordinate system; and automatically mapping said touch screen co-ordinate system to said display co-ordinate system using said determined location and the location of the at least one reference mark in said display co-ordinate system.