Monitoring and correction of geometric distortion in projected displays

Abstract

A technique, and associated system and computer executable program code on a computer readable storage medium, for automatically correcting distortion of a front-projected display under observation by at least one camera. The technique may be employed in a myriad of front-projected display environments, e.g., single or multiple projectors and cameras are used. The technique includes: observing a first image, projected from at least one projector, comprising at least one target distribution of light intensities; for each conglomeration of white pixels of a difference image, compute a bounding box comprising a corresponding conglomeration of pixels in a framebuffer information of the camera, compute a bounding box comprising a corresponding conglomeration of pixels in a framebuffer information of the projector, compute an initial homography matrix, H, mapping pixels of the projector's bounding box to those of the camera's bounding box, optimize the initial homography matrix, compute a central location, (C, C), of the camera's bounding box using the initial homography matrix; and using a plurality of correspondence values comprising the correspondence, compute a corrective transform to aid in the automatic correcting of the display.