Image read apparatus

Details Image read apparatus Image read apparatus

1988-03-16

1989-08-15

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358443, H04N 140

Patent

active

048580236

ABSTRACT:
An image read apparatus provided with a reader which scans an original and a reference white pattern and reads the image by an image sensor, a line RAM which temporarily stores therein the read difference white pattern, a conversion memory which has a conversion table for performing shading correction and gamma correction and which outputs a correction signal from an image signal of the reference white pattern and an original image signal, and a binary digitizing circuit which binary-digitizes the correction signal by a predetermined method and outputs it to an output circuit, so as to simultaneously perform the shading and gamma correction of the original image signal and reads a halftone faithfully to the original to output the read image signal to an output device.

REFERENCES:
patent: 4661843 (1987-04-01), Sekizawa
patent: 4698669 (1987-10-01), Sekizawa
patent: 4717954 (1988-01-01), Fujita
patent: 4731662 (1988-03-01), Udagawa
patent: 4734762 (1988-03-01), Aoki

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