Patent ID: 6791452
Filing Date: 2004-09-14
Classification: G01B,G06K

Abstract:
A platform for sensing physical objects having electromagnetically actuable tags associated therewith, the platform comprising:a. a sensing surface having a sensing area; b. beneath the sensing surface, an array of coils; c. control circuitry for (i) causing at least one of the coils to generate a time-varying interrogation signal, the interrogation signal interacting with tags disposed on the surface within the sensing area, (ii) receiving a signal indicative of the interrogation signal as affected by the tags and their proximities to the various coils, and (iii) based on the received signal, determining positions for each of the objects within the sensing area; and d. a display generator for creating, visible on the sensing surface, displays relating to the sensed objects derived from the tags associated therewith, the displays remaining co-located with the sensed objects notwithstanding movement thereof on the sensing surface.