Patent ID: 9189086
Filing Date: 2015-11-17
Classification: G06F

Abstract:
1. An interactive input system comprising: at least one light source configured to emit radiation at a particular frequency into a region of interest; at least one imaging assembly having a field of view aimed into the region of interest into which at least one active pointers are brought and capturing image frames, each active pointer emitting modulated radiation comprising a combination of subcarrier frequencies unique thereto, each of the subcarrier frequencies being different than the particular frequency; and processing structure in communication with the at least one imaging assembly and processing captured image frames to detect the existence of a pointer therein, when an active pointer exists in captured image frames, said processing structure demodulating the captured image frames to determine frequency components thereof and examining the frequency components to determine the subcarrier frequency combination of the modulated radiation emitted by the active pointer and thereby to determine at least one predefined attribute of said active pointer and to determine the amplitudes of the subcarrier frequencies of the determined subcarrier frequency combination and thereby to determine another attribute of said active pointer.