Document reader

Details Document reader Document reader

1981-06-10

1984-01-03

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

250208, 250578, 358213, 358285, G06K 900, H04N 314

Patent

active

044245904

ABSTRACT:
A document reader for use in a facsimile system which generates a continuous output signal without the use of complex memory circuitry. Light-receiving devices are divided into plural ordered groups of ordered light-receiving devices. A voltage application switch is provided for each group which selectively couples first terminals each of the light-receiving devices in that group to a positive power source or ground. Common lines connect second terminals of like order ones among even number-order groups of the light-receiving devices and second terminals of like order ones of light-receiving devices among odd number-order groups. A reading switch is coupled between each common line and an output terminal. The reading switches are actuated in sequence at a constant time interval.

REFERENCES:
patent: 3801884 (1974-04-01), Sequin
patent: 3814846 (1974-06-01), Snow
patent: 3995107 (1976-11-01), Woywood
patent: 4081843 (1978-03-01), Okano
patent: 4322752 (1982-03-01), Bixby

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