Patent ID: 7889193

Claim:
A method of determining a data model of virtual information to be superposed with an image of a real object in an object tracking process, said method being performed on at least one digital computer configured to implement method steps comprising: providing a three-dimensional CAD model ( 10 ) on said at least one digital computer wherein said three-dimensional CAD model ( 10 ) represents a real object to be tracked in a subsequent object tracking process; generating different synthetic two-dimensional views ( 31 to 34 ) from said CAD model ( 10 ) on said at least one digital computer; subjecting each generated view ( 31 to 34 ) to edge extraction on said at least one digital computer to determine at least one extracted edge ( 38 , 39 ) in a respective view and determining which edges of the real object to be tracked are of relevance for said subsequent object tracking process; and, transforming on said at least one digital computer said at least one extracted edge ( 38 , 39 ) extracted from said respective view selected from said respective views ( 31 to 34 ) to a three-dimensional contour model ( 85 , 91 ) corresponding to a data model.