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:
Oct. 05, 1993
Filed:
Mar. 01, 1991
Itaru Furukawa, Kyoto, JP;
Takashi Sakamoto, Kyoto, JP;
Dainippon Screen Mfg. Co., Ltd., Kyoto, JP;
Abstract
An image reader using CCD line sensors which effects color correction of three color difference signals resulting from reading of a color original by the CCD line sensors. This image reader employs a plurality of color correction characteristics for enlarging the color difference signals in regions where the color difference signals are large, and limiting enlargement ratios of the color difference signals in regions where the color difference signals are small. A color correction characteristic is selected manually or in accordance with the luminance level of each pixel. Noises appearing in shadow portions are reduced by the color correction based on the limited enlargement ratios of the color difference signals effected in the regions where the color difference signals are small.