Showing papers on "Optical character recognition published in 1970"

Optical character recognition system

Abstract: An optical character recognition system utilizes a reflecting data card including one or more fonts for the entry of one of a plurality of optically recognizable characters. The card also includes one or more non-reflecting timing marks for indicating the position of these fonts. Conventional means are used for passing these data cards at a predetermined speed past an array of one or more columns of optical comparators and a light source adapted to shine light into the cards so that it will reflect onto the array. Each comparator is adapted to produce a voltage pulse in response to a drop in the intensity of reflected light. In addition, a timing comparator is provided for detecting the timing marks and thereby triggering one or more timing pulse sources.

Recognition of Handprinted Numerals by Two-Stage Feature Extraction

Abstract: An optical character recognition system for handprinted numerals of noisy and low-resolution measurement is proposed. The system consists of the two-stage feature extraction process. In the first stage a set of primary features insensitive to the quality and format of a black-white bit pattern are extracted. In the second stage, a set of properties capable of discriminating the character classes is derived from primary features. The system is simple and reliable in that only three kinds of primary features are needed to be detected. The recognition is based on the decision tree which tests the logic statements of secondary features.