Machine Recognition of Handprinted Characters

摘要

Machine recognition of handprinted characters is accomplished on a reference alphabet consisting of the 47 characters of the FORTRAN Programming Language (alphanumeric +-=*/()$., and blank). The system is comprised of an optical scanner reader (OSR) which digitizes data with a maximum vertical resolution of 48 lines, and a software measurement-decision system. The OSR operates at 10 characters/second in conjunction with an XDS 930 computer, and produces digitized characters on magnetic tape. Recognition is done at rates of 3.5 to 6 characters/second off-line via the measurement-decision system operating on a CDC 6400/6600 computer system. The measurement system generates a directed graph representation of each character and extracts a primary feature vector. This vector consists of cavity (both open and closed) and spur information. Other specialized measurements are made later in the recognition process under the control of a deterministic decision tree. (Author)