Patent ID: 8059916

Claim:
A method of calibrating an image display system comprising a plurality of projectors oriented in the direction of an image projection screen and at least one calibration camera, wherein at least the following conditions apply to the method: the calibration camera captures k distinct images of the image projection screen; all projectors contributing to each captured image render a set of fiducials captured by the calibration camera; a set of three-dimensional points corresponding to camera image points are computed as respective intersections of back-projected rays defined by the points and a canonical surface approximating the projection screen; the points are matched with projected fiducials to generate a set of corresponding match points; the set of three-dimensional points observed in different camera views are represented as a set of 3D surface points with a known neighborhood function; the 3D points are modeled as a constraint system such that the error distance between two points seen in two different camera views are computed as the geodesic distance between the first point, as seen in the second view, and the second point, as seen in that same view; and points that correspond to the same projector location but have different locations on the 3D surface are adjusted according to an error metric that minimizes the total error represented in the constraint system.