Patent ID: 7893393
Filing Date: 2011-02-22
Classification: G03B,H04N

Abstract:
1. A method of operating an image display system comprising one or more projectors oriented to project an image on a projection screen and one or more image sensors oriented to acquire an image projected on the projection screen, the method comprising: operating the projector to project a calibration image comprising one or more image fiducials on the image projection screen; operating the image sensor to acquire the projected calibration image including the image fiducials as projected on the projection screen; identifying approximate three-dimensional position coordinates of the respective image fiducials as projected on the projection screen by applying one or more three-dimensional mapping functions, wherein the three-dimensional mapping functions represent the manner in which two-dimensional points in a projector frame map to three-dimensional points on a virtual approximation of the projection screen; fitting one or more parametric functions to a neighborhood of points representing the approximate three-dimensional image fiducial position coordinates; generating one or more parametric models from the parametric functions fit to the neighborhood of points; validating the identified fiducial positions by applying the parametric model to compare approximations of the fiducial positions predicted by the parametric model with respective ones of the fiducial positions identified with the three-dimensional mapping functions; and operating the projector in a manner that is at least partially dependent on the result of the validation of the identified fiducial positions.