Interactive input system and information input method therefor
First Claim
Patent Images
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.
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Abstract
An interactive input system comprises at least one imaging assembly having a field of view looking into a region of interest and capturing image frames and processing structure in communication with the at least one imaging assembly. When a pointer exists in captured image frames, the processing structure demodulates the captured image frames to determine frequency components thereof and examines the frequency components to determine at least one attribute of the pointer.
31 Citations
38 Claims
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1. An interactive input system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 32, 33, 34, 35, 36)
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21. A method of inputting information into an interactive input system comprising:
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emitting, by at least one light source, radiation at a particular frequency into a region of interest; capturing, by at least one imaging assembly, image frames of the region of interest into which at least one active pointers are brought, 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; processing the captured image frames to detect the existence of a pointer therein; and when an active pointer exists in captured image frames, 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 the 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. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 37, 38)
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Specification