Optics: image projectors – Projected image combined with real object
Reexamination Certificate
2003-06-14
2004-09-28
Fuller, Rodney (Department: 2851)
Optics: image projectors
Projected image combined with real object
C353S122000, C353S121000, C348S586000
Reexamination Certificate
active
06796656
ABSTRACT:
BACKGROUND OF THE INVENTION
U.S. Pat. No. 6,361,173, describes an image projection system in which a matte signal selectively inhibits the projected image within the silhouette area of a presenter when in front of the projection screen.
In the U.S. patent application Ser. No. 10/370,356, a projected infrared pattern on the presenter is displaced from the surrounding pattern on the unobscured screen area when viewed by an infrared camera displaced a few inches from an infrared projector. Except in the area of the presenter, the two patterns subtract to zero.
The complexity of projecting an infrared non-repetitive pattern and obtaining a camera image of such a pattern at high resolution has lead to the development of a less complex matte generation method described below.
BRIEF SUMMARY OF THE INVENTION
A white projection screen containing a small number of infrared retro reflective elements, uniformly distributed over the screen's surface, is illuminated by an infrared source and observed by a coaxially located infrared camera. A matte signal is generated utilizing a high signal level from the infrared camera in all unobscured areas on the screen, and a very low signal level in screen areas obscured by a presenter between a projector and the projection screen.
REFERENCES:
patent: 6454415 (2002-09-01), Vlahos
patent: 6473115 (2002-10-01), Harman
patent: 6554434 (2003-04-01), Sciammarella et al.
patent: 6598979 (2003-07-01), Yoneno
patent: 2002/0093666 (2002-07-01), Foote et al.
patent: 2003/0227470 (2003-12-01), Genc et al.
Leibe et al. The Perceptive Workbench: Toward Spontaneous and Natural Interaction in Semi-Immersive Virtual Environments.,3/2000, Proceedings of IEEE Virtual REality 2000 as found at http://www.gvu.gatech.edu/ccg/publications.html.
Blakely & Sokoloff, Taylor & Zafman
Fuller Rodney
Imatte, Inc.
Sever Andrew
LandOfFree
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