Method of and apparatus for correcting image signal

Details Method of and apparatus for correcting image signal Method of and apparatus for correcting image signal

1988-09-07

1990-01-23

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358443, 358447, H04N 100, H04N 140

Patent

active

048962228

ABSTRACT:
An object such as a stimulable phosphor sheet on which image information is recorded is scanned by a light beam such as a laser beam, and light bearing the image information from the object is photoelectrically detected to produce an image signal representing the image information. A monitor signal representing the light beam is divided into a high-frequency component and a low-frequency component. A corrective signal is produced multiplying a ratio of the high-frequency component to the low-frequency component by a constant. The corrective signal is then subtracted from the image signal.

REFERENCES:
patent: 4054377 (1977-10-01), Gibson
patent: 4150402 (1979-04-01), Tietz
patent: 4548463 (1985-10-01), Cato
patent: 4620200 (1986-10-01), Fukai
patent: 4691241 (1987-09-01), Tomohisa
patent: 4734783 (1988-03-01), Horikawa

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