Optical correlation filters for large-class OCR applications
David P. Casasent, Anand K. Iyer, Srinivasan Gopalaswamy · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1991
The performance of two new optical correlation filters (G-MACE and MINACE) for large class (many fonts and true class words) OCR (optical character recognition) applications is considered. We consider filters that can recognize many key words in upper case (UC) and mixed case (MC) and various point sizes in the presence of OCR scanner sampling errors. New results are presented and guidelines for large class filters are advanced.