Colored image reading apparatus

Details Colored image reading apparatus Colored image reading apparatus

1988-10-20

1991-09-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 358 80, H04N 146

Patent

active

050518194

ABSTRACT:
A colored image reading apparatus in which the light-intensity signals produced in response to the red, green and blue color components of the light carrying the image information picked up from a given document sheet are converted into quantity-of-ink data signals indicating the quantities of cyanic-, magenta- and yellow-colored inks to be used for the formation of colored pixels, wherein the conversion of the light-intensity signals into the quantity-of-ink data signals is effected by a conversion table into which are stored quantity-of-ink data produced through mathematic calculation involing logalithmic conversion of variable values. By virtue of such mathematic calculation effected in the conversion table, the can dispense with any hardware implementation that would otherwise be required for the logalithmic conversion of voltage signals produced by an image sensor.

REFERENCES:
patent: 4206998 (1980-06-01), Tokuda
patent: 4661184 (1987-04-01), Sekizawa et al.
patent: 4727434 (1988-02-01), Kawamura
patent: 4739397 (1988-04-01), Hayashi
patent: 4819193 (1989-04-01), Imao

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