Patent ID: 7626578
Filing Date: 2009-12-01
Classification: G06F

Abstract:
1. A method for calibrating a touch threshold for an interactive display system that responds to users touching a display surface on which images are projected by sensing light reflected from where the user touches the display surface, comprising the steps of: prompting a user to touch a region on a display surface as part of a touch threshold setting procedure: projecting an image onto the display surface indicating the region where the user is to touch the display surface: after prompting the user to touch the region, detecting a likely touch of the region on the display surface by the user, based upon criteria related to an image of the display surface that indicate the user has touched the region; detecting an intensity of reflected light for points in the image within the region where it is determined that the user likely touched the display surface; and setting the touch threshold equal to the intensity of the points within the region where it is determined that the user likely touched the display surface.