公开(公告)号：US3597731A

公开(公告)日：1971-08-03

申请号：US3597731D

申请日：1969-07-28

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： REITBOECK HERIBERT J ,  BRODY THOMAS P

IPC: G06K9/52 ,  G06K9/04

CPC classification number: G06K9/522

Abstract: Described is apparatus, employing a mathematical transform involving addition and differencing only, for recognizing patterns or characters which can be distorted or misaligned with respect to optical-sensing means without any sacrifice in the accuracy of the device. When executed on a digital computer, the mathematical transform utilized in accordance with the invention needs only a fraction of the computation time needed for transforms utilized by prior art devices. At the same time, it is better able to cope with certain distortions that are characteristic of hand-printed letters and digits such as inclination, small rotation and the like.