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:
Dec. 11, 1990
Filed:
Dec. 16, 1988
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
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.