Image processing apparatus

Details Image processing apparatus Image processing apparatus

1986-06-12

1987-11-03

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358282, H04H 140

Patent

active

047046376

ABSTRACT:
In an image processing apparatus, an A/D converter converts an input image signal to a digital image signal. A comparator compares a threshold level from a CPU with the input digital image signal and processes the digital image signal in a normal mode, or in a NEG/POS (negative/positive) reversal mode for reversing the image density. The CPU selectively sends different threshold levels to determine the operation mode of the comparator.

REFERENCES:
patent: 4257070 (1981-03-01), Sommer et al.
patent: 4272789 (1981-06-01), Birom
patent: 4567527 (1986-01-01), Yokomizo
patent: 4578711 (1986-03-01), White et al.
patent: 4584703 (1986-04-01), Hallberg
"Chromagraph 399-der neue Multicolor-Scanner mit Laser", with partial translation.

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