Binary coding circuit

Details Binary coding circuit Binary coding circuit

1980-07-18

1983-08-30

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 54, G06K 936

Patent

active

044020872

ABSTRACT:
A binary coding circuit for converting analog electrical signals produced by a photoelectric conversion device in parallel form in either a line or column direction into binary signals representative of a background region and a character region in which fluctuations in characteristics of the photoelectric conversion elements of the conversion device and effects due to inclination of the photoelectric conversion device relative to a sheet from which characters are to be read are corrected. A plurality of comparators and level setting circuits are provided for detecting background region representing levels of the analog electrical signals in the one of the column and line directions and to set the background region representing levels of the analog electrical signals in that one of the column and line directions equal to one another. The analog electrical signals are applied to first input terminals of the comparators to the second input terminals of which are applied a binary coding threshold voltage.

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patent: 4129853 (1978-12-01), Althauser et al.
patent: 4251800 (1981-02-01), Sanner et al.

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