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:
May. 16, 1989
Filed:
Aug. 14, 1987
Hermann Fuchsberger, Ismaning, DE;
AGFA Gevaert Aktiengesellschaft, Leverkusen, DE;
Abstract
An improved method for correction of color saturation, in electronic image processing, automatically compensates for brightness changes resulting from contrast processing. The method is used with electronic image processing, in which a two-dimensional original image is electro-optically scanned along rows and columns for three primary colors, the resulting image signals are transformed into a luminance signal Y and two color-difference or chrominance signals C1, C2, and the luminance signal is modified by electronic contrast processing. The invention improves the basic image processing method by measuring the luminance signals Y.sub.1 and Y.sub.2 which occur, respectively, before and after contrast processing, and multiplying their quotient Y.sub.2 /Y.sub.1 by each of the two chrominance signals C1, C2. This compensates automatically for the increase in color saturation which accompanies a brightness reduction and for the decrease in color saturation which accompanies a brightness increase.