Color image processing apparatus having exact color reproduction

Details Color image processing apparatus having exact color reproduction Color image processing apparatus having exact color reproduction

1988-12-16

1990-12-11

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 80, H04N 146

Patent

active

049774484

ABSTRACT:
An image processing apparatus is for exactly reproducing color originals. The apparatus includes a circuit for removing a ground color contained in an input color signal by forcibly changing an input signal having a level larger than a predetermined level to white. The apparatus may include a gamma correction circuit having therein a plurality of selectable gamma collection data. The apparatus may also include a circuit for producing a natural monochromatic signal from signals corresponding to three primary color signals R, G and B by performing an operation expressed as [(signal corresponding to R).times.2.sup.I +(signal corresponding to G).times.2.sup.I +(signal corresponding to B).times.2.sup.K ]/2.sup.L wherein I, J, K and L are integers and 2.sup.I +2.sup.J +2.sup.K =2.sup.L.

REFERENCES:
patent: 4271436 (1981-06-01), Kurose et al.
patent: 4679074 (1987-07-01), Sugiura et al.
patent: 4739397 (1988-04-01), Hayashi
patent: 4745466 (1988-05-01), Yoshida et al.
patent: 4833532 (1989-05-01), Abe

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