Patent US 3,987,244

A programmable image processor compares successive vertical frames of the received video image of an object placed within a television camera field of view with a similar object video image stored in memory, and provides a signal manifestation of the video mismatches therebetween. The programmable image processor provides for the scanning of the received video image by the stored video image in one, or both, of two orthogonal directions within the camera field of view, to distinguish between video mismatches resulting from dissimilarities in the video images and mismatches resulting from the misalignment of the object in one, or both of the orthogonal directions within the camera field of view.