Interactive input system and method
First Claim
Patent Images
1. An image capture method comprising:
- generating a synchronization signal based on a modulated illumination signal;
using said synchronization signal to synchronize;
(1) illumination timing of an illumination assembly emitting a light curtain over a region of interest, (2) image frame capture by at least one image sensor of the region of interest, and (3) illumination timing of an illumination source of an active pointer positioned within the region of interest such that at least two image frames are captured including;
a first image frame being captured when said illumination assembly is on, anda second image frame being captured when the illumination source of said active pointer is on and said illumination assembly is off,wherein the first image frame and the second image frame are successive image frames;
processing the at least two image frames captured to;
identify a passive pointer when there is a bright region in the first image frame and there is no bright region in the second image frame anddetermine a location of the passive pointer within the region of interest of the first image frame; and
processing the at least two image frames captured to;
identify said active pointer when there is not bright region in the first image frame and there is a bright region in the second image frame anddetermine the location of the active pointer within the region of interest of the second image frame.
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Abstract
An image capture method comprises generating a synchronization signal based on modulated illumination; and synchronizing image frame capture of at least one image sensor using the synchronization signal with the illumination timing of an active pointer within a region of interest in the field of view of the at least one image sensor.
31 Citations
27 Claims
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1. An image capture method comprising:
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generating a synchronization signal based on a modulated illumination signal; using said synchronization signal to synchronize;
(1) illumination timing of an illumination assembly emitting a light curtain over a region of interest, (2) image frame capture by at least one image sensor of the region of interest, and (3) illumination timing of an illumination source of an active pointer positioned within the region of interest such that at least two image frames are captured including;a first image frame being captured when said illumination assembly is on, and a second image frame being captured when the illumination source of said active pointer is on and said illumination assembly is off, wherein the first image frame and the second image frame are successive image frames; processing the at least two image frames captured to; identify a passive pointer when there is a bright region in the first image frame and there is no bright region in the second image frame and determine a location of the passive pointer within the region of interest of the first image frame; and processing the at least two image frames captured to; identify said active pointer when there is not bright region in the first image frame and there is a bright region in the second image frame and determine the location of the active pointer within the region of interest of the second image frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An interactive input system comprising:
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at least one image sensor having a field of view aimed at a region of interest; an illumination assembly configured to emit a light curtain over said region of interest; and processing structure configured to; process image frames captured by said at least one image sensor and determine locations of one or more pointers brought into said region of interest, wherein illumination timing of the illumination assembly, image frame capture of said at least one image sensor and illumination timing of an illumination source of an active pointer brought into said region of interest are synchronized using a synchronization signal based on the modulated illumination signal such that at least two image frames are captured including; a first image frame being captured when said illumination assembly is on, and a second image frame being captured when the illumination source of said active pointer is on and said illumination assembly is off, wherein the first image frame and the second image frame are successive image frames; process the at least two image frames captured to; identify a passive pointer when there is a bright region in the first image frame and there is no bright region in the second image frame and determine a location of the passive pointer within the region of interest of the first image frame; and process the at least two image frames captured to; identify said active pointer when there is no bright region in the first image frame and there is a bright region in the second image frame and determine the location of the active pointer within the region of interest of the second image frame. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification