Method for achieving accurate optical character reading of print

Details Method for achieving accurate optical character reading of print Method for achieving accurate optical character reading of print

1977-01-12

1978-08-08

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

3401461AL, G06K 918

Patent

active

041059972

ABSTRACT:
A method of preparation of printed text for optical character reading is disclosed. In addition, a method of checking for errors in the optical character reading of the prepared test is disclosed. The basis of the text preparation method is to add check symbols to each line of text during its preparation. The check symbols are produced by sequentially processing the ASC II code for the printed alpha-numeric characters as a dividend where the divisor is the bit sequence of a unique generating polynomial code. The remainder bits of this division operation are then translated to be check symbols which accompany the line of printed text. The basis of the check method is as follows: During optical character reading of the text, the line of information text including check symbols is processed in a routine manner to produce an ASC II code serial bit stream for the alpha-numeric character and check symbols. The alpha-numeric portion of the bit stream is then processed by the unique generating polynomial code. The remainder bits from this process are then compared with the bit equivalents of the check symbols to determine whether the line has been read correctly by the optical character reader. If the line has been read correctly, the information bit stream, including check symbols, is released for subsequent operation. If the line has not been read correctly, the optical character reading operation is either recycled or the line of text is transformed by facsimile for subsequent operation.

REFERENCES:
patent: 3303463 (1967-02-01), Hamburgen
patent: 3465287 (1969-09-01), Kennedy et al.
patent: 3582881 (1971-06-01), Burton
patent: 3678469 (1972-07-01), Freeman et al.
patent: 3859630 (1975-01-01), Bennett

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