Image signal processing device

Details Image signal processing device Image signal processing device

1989-06-01

1992-03-03

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358443, 358448, H04N 140

Patent

active

050937332

ABSTRACT:
An image signal processing device includes an A/D converter which detects a white peak level of an analog image signal corresponding to the intensity of light obtained by an optical scan and for outputting a corresponding digital signal including a plurality of bits. A storage circuit stores the digital signal corresponding to the detected white peak level in digital form. A D/A converter converts the digital signal read out of the storage circuit into an analog signal. A voltage divider generates a reference voltage from the analog signal supplied from the D/A converter. A comparator compares the analog image signal with the reference voltage supplied from the voltage divider to thereby generate a digital image signal corresponding to the analog image signal.

REFERENCES:
patent: 4578715 (1986-03-01), Yamaguchi
patent: 4591826 (1986-05-01), Seiler
patent: 4847695 (1989-07-01), Arai

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