A system for determining a stylus position of a stylus includes a telemetric imager and a controller electrically coupled to the telemetric imager. The controller determines the stylus position based on a generated image of a stylus tip from a first direction and a generated image of the stylus tip from...http://www.google.fr/patents/US20060028457?utm_source=gb-gplus-shareBrevet US20060028457 - Stylus-Based Computer Input System
