×

Method for controlling an intensity of an infrared source used to detect objects adjacent to an interactive display surface

  • US 20050277071A1
  • Filed: 06/14/2004
  • Published: 12/15/2005
  • Est. Priority Date: 06/14/2004
  • Status: Active Grant
First Claim
Patent Images

1. A method for controlling an intensity of a light source in response to an ambient light level, comprising the steps of:

  • (a) providing a region that is substantially prevented from receiving incident ambient light, but is able to receive light generally only from the light source;

    (b) capturing an image of both the region and a diffusing surface through which the ambient light passes, producing a signal corresponding to the image;

    (c) processing the signal to determine a level of the light reflected from the region and the ambient light level for the ambient light passing through the diffusing surface; and

    (d) controlling the intensity of the light source so that the level of the light reflected from the region exceeds the ambient light level by a predefined amount.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×