Patent ID: 7740361

Claim:
A method of operating an image display system comprising one or more projectors oriented to project an image on a projection screen and a plurality of image sensors or a single, multi-view sensor configured to acquire overlapping portions of an image projected on the projection screen, the method comprising: operating the projector to project an image comprising one or more image fiducials on the image projection screen; operating the one or more image sensors to acquire first and second portions I 1 , I 2 of the projected image such that the first and second portions I 1 , I 2 overlap each other in the projected image; identifying screen position coordinates for image fiducials in the first and second portions I 1 , I 2 of the projected image; establishing a first set of distance metrics D 1 for the first portion I 1 of the projected image by utilizing the identified screen position coordinates to determine respective distances between adjacent points in the first portion I 1 of the projected image; establishing a second set of distance metrics D 2 for the second portion I 2 of the projected image by utilizing the identified screen position coordinates to determine respective distances between adjacent points in the second portion I 2 of the projected image; constructing a global point set from the first and second sets of distance metrics D 1 , D 2 wherein points within a region where the first and second portions I 1 , I 2 of the projected image overlap are derived from only one of the first and second sets of distance metrics D 1 , D 2 such that a first subset G 1 of the global point set comprises fiducial positions derived from only one of the first and second sets of distance metrics D 1 , D 2 and a second subset G 2 of the global point set comprises fiducial positions derived from the other of the first and second sets of distance metrics D 1 , D 2 ; optimizing alignment of the first and second subsets G 1 , G 2 of the global point set by adjusting fiducial positions in the global point set in a manner that at least partially accounts for differences between local positional data derived from the first and second sets of distance metrics D 1 , D 2 and global positional data of the fiducial positions in the global point set; and operating the projector in a manner that is at least partially dependent on the optimized alignment of the global point set.