Patent ID: 8310504

Claim:
A system comprising: a public display configured to simultaneously display information to a plurality of users; a camera configured to directly sense light produced by at least one handheld light source held in front of the public display by at least one of the plurality of users and to generate image indicative of the sensed light; and a processing module operatively coupled to the public display and the camera and configured to receive the image indicative of the sensed light from the camera and control the information displayed on the public display based on the received image, wherein the processing module is further configured to cause the public display to display a scalable path and to instruct at least one of the plurality of users to move the at least one handheld light source in a trajectory as the displayed scalable path; wherein the processing module is further configured to identify at least one of the plurality of users who is ready to interact with the public display based on a comparison between the trajectory of the light sensed by the camera and the displayed scalable path and wherein the processing module is further configured to establish an interaction session with the identified at least one of the plurality of users; wherein the processing module is further configured to filter blobs on the image indicative of the sensed light by eliminating areas that are too small or too large to constitute an image of the handheld light source.