Apparatus for recognizing alphanumeric characters

摘要

An alphanumeric character image recognition system includes a first stage comprising at least a first, second and third digital image signal processing network having each at least one input terminal and at least one output terminal and said networks being designed to process image information from digital image signals, and comprising at least a first, second and third memory register having each at least one input terminal and at least one output terminal and the input terminals of the first, second and third memory registers being connected to the output terminal of the first network, the output of the second network and the output terminal of the third network respectively and said memory registers being designed to contain the image information processed by the first, second and third digital image signal processing networks, and a second stage characterized in that said second stage comprises at least one first and one second classifier network having each at least one first and one second input terminal and a plurality of output terminals, the first input terminal of the first classifier network being connected to the output terminal of the first memory register and the second input terminal of said first classifier network being connected to the output terminal of the second memory register and the first input terminal of the second classifier network being connected to the output terminal of the second memory register and the second input terminal of said second classifier network being connected to the output terminal of the third memory register and at least one third classifier network having a plurality of input terminals connected to a plurality of output terminals of the first and second classifier networks and a plurality of output terminals which are output terminals of the system and said classifier networks being designed to carry out consecutive statistical operations on the image information until there are obtained statistical values corresponding to a predetermined classification of images to be recognized.