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 Title: |
US6785402:
Head tracking and color video acquisition via near infrared luminance keying
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Jouppi, Norman; Palo Alto, CA
Iyer, Subramonium; Fremont, CA
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| Assignee: |
Hewlett-Packard Development Company, L.P., Houston, TX
other patents from HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (815532) (approx. 1,981)
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| Published / Filed: |
2004-08-31
/ 2001-02-15
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| Application Number: |
US2001000784902
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| IPC Code: |
Advanced:
G06F 3/00;
G06F 3/01;
G06F 3/033;
G06F 3/042;
G06T 5/00;
Core:
G06F 3/041;
more...
IPC-7:
G03B 21/26;
G06K 9/00;
H04N 9/74;
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| ECLA Code: |
G06F3/01B2; G06F3/042; G06T7/00S2; G06T7/20C;
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| U.S. Class: |
382/103;
353/030;
348/584;
348/590;
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| Field of Search: |
353/030
348/584-599
382/103
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| Priority Number: |
| 2001-02-15 |
US2001000784902 |
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| Abstract: |
A system and corresponding method for head tracking and color video acquisition via near infrared luminance keying is disclosed. The head of the local user is tracked in real time by uniformly illuminating a rear projection screen that surrounds a display cube with light having a wavelength in the near-infrared spectrum. A near-infrared image of the head of the local user is acquired by a near-infrared camera equipped with filters that discern the difference between the illuminated rear projection screen and any foreground illumination. A color image of the head of a local user and the projection of a remote location are acquired by a color camera, placed in close proximity to the near-infrared camera. A bounding box is then placed around the head of the local user in the near-infrared image. This bounding box is then translated to the view space of the color camera. This translated image is then used to crop the color image. The cropped color image is then transmitted to the remote location.
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| Primary / Asst. Examiners: |
Boudreau, Leo; Akhavannik, Hussein
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| INPADOC Legal Status: |
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| Family: |
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First Claim:
Show all 18 claims |
What is claimed is:
1. A method of detecting and tracking the head location of a user within an area comprising the steps of:
- (a) uniformly illuminating a rear projection screen that is located in a position behind the user with light having a wavelength in the near-infrared spectrum;
- (b) projecting an image of a location remote from the user onto at least a portion of the rear projection screen, where an image projector emits light having a wavelength outside of the near-infrared spectrum;
- (c) defining the boundary of the head location based on detected near-infrared luminance differences within the area with respect to the rear projection screen.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 3 U.S. patent(s) that reference this one
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