Patent ID: 8358873
Filing Date: 2013-01-22
Classification: G03B

Abstract:
1. A method for 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, comprising: capturing, via the calibration camera, k distinct images of the image projection screen including a total of N image points; wherein each of the projectors contributing to each captured image renders a set of fiducials captured by the calibration camera; computing a global set of points corresponding to said N image points using information including one or both of relative positions of the cameras and the shape of a canonical surface approximating the projection screen; matching the points with projected fiducials to generate a set of corresponding match points, wherein the the relationship between the N image points and the match points is represented by a non-parametric mapping from each of the N image points to its corresponding position on the canonical surface; generating a local parametric function defining the relationship between one of the N image points and each of its neighbors, for each of the N image points; modeling the global set of points as a constraint system such that the error distance between two points observed in two different camera views is computed based on a distance metric between the first point, as seen in the second view, and the second point, as seen in that same view; and adjusting, according to an error metric that minimizes the total error represented in the constraint system, points that correspond to the same projector location but which have different computed locations in the global set of points.