| 摘要 |
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. |
