The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 15, 1991
Filed:
Apr. 04, 1989
Applicant:
Inventor:
Takanori Ito, Yokohama, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358 79 ; 358 75 ;
Abstract
A black color component extracting apparatus used for a color image reproducing machine. The apparatus includes a hue area judgement unit for judging to which hue area among at least three predetermined hue areas the hue represented by input color image signals belongs. With respect to the judged hue area according to this judgement, the black color extraction parameters are set, and in accordance with the set black color extraction parameters, black color component is extracted. The black color extraction parameters are determined from two chromatic colors P and Q positioned in respective boundary planes which defines the judge hue area, and from an achromatic color N.