Patent ID: 7355584
Filing Date: 2008-04-08
Classification: G06F

Abstract:
1. A passive optical marker system for use in accordance with an electronic whiteboard system, the electronic whiteboard system including a data entry surface, an image capture device and an image projection device, the passive optical marker system comprising: an infrared-emitting light source for illuminating the data entry surface; and an infrared light reflector having a low-friction glide and a non-isotropic surface, the reflector being worn by a user such that the low-friction glide comes into contact with the surface when the user enters data and, in accordance with such data entry, infrared light emitted by the source is reflected from the reflector to the image capture device, such that the image capture device can capture the reflected infrared light and track a position of the reflector, and such that the image projection device can project an image which is viewable on the surface, in proximity of the position of the reflector, and representative of the data entered in accordance with the reflector on the surface.