Patent ID: 7768534

Claim:
A method of determining inaccuracy information ( 600 ) for providing a measurement statement in positioning a data model ( 1 ) of virtual information in an augmented reality system, comprising: taking an image of at least part of the real environment by means of a camera ( 2 , 3 ); projecting said data model ( 1 ) to an image plane of a display device ( 4 ) for mixing with the image of the at least part of the real environment; using a tracking system ( 100 ) in obtaining tracking information ( 10 - 0 , 10 - 1 , 10 - 2 ) for defining a virtual coordinate system ( 20 , 30 ) based on which the data model is projected to the image plane of the display device and serving to map said data model ( 1 ) at a specific position in said image; processing data of said tracking system ( 100 ); processing data of a camera calibration ( 200 ) providing information on camera parameters of said camera; processing situation-specific data ( 300 ) providing information on representation of said data model ( 1 ) with respect to the virtual coordinate system ( 20 , 30 ); computing by a data processing device said inaccuracy information from an uncertainty in determining the virtual coordinate system, an uncertainty in determining the camera parameters and uncertainties arising in the relative positioning of the data model with respect to the virtual coordinate system.