| US 7,574,045 B2 | ||
| Model-based recognition of objects using a calibrated image system | ||
| Christian Simon, Laval (Canada); Djamel Yahia Meddah, Montreal (Canada); and Stéphane Baldo, Montreal (Canada) | ||
| Assigned to Matrox Electronic Systems Ltd., Dorval (Canada) | ||
| Appl. No. 10/478,306 PCT Filed Jul. 27, 2001, PCT No. PCT/CA01/01081 § 371(c)(1), (2), (4) Date Dec. 04, 2003, PCT Pub. No. WO02/099739, PCT Pub. Date Dec. 12, 2002. |
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| Prior Publication US 2004/0165775 A1, Aug. 26, 2004 | ||
| Int. Cl. G06K 9/00 (2006.01) | ||
| U.S. Cl. 382—181 [382/276] | 22 Claims |
| 1. An image processing system adapted to recognize an object disposed on a predetermined world surface, the system comprising:
means for calibrating a visual environment by defining a world coordinate system relative to a world surface and determining
a transformation between coordinates in an image coordinate system and coordinates in said world coordinate system, in order
to define the predetermined world surface;
means for acquiring an image of the object disposed on the predetermined world surface in a calibrated visual environment,
the image comprising a distorted projection of the world surface;
means for analyzing the acquired image to locate one or more local features of the image, with respect to the image coordinate
system of the image;
means for mapping the local features into said world coordinate system of the world surface according to said transformation;
and
means for matching the mapped local features to a model defined in the world coordinate system.
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