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:
Aug. 07, 2001
Filed:
Mar. 18, 1998
Itaru Furukawa, Kyoto, JP;
Fujio Akioka, Kyoto, JP;
Dainippon Screen Mfg. Co., Ltd., Kyoto, JP;
Abstract
Average density values are calculated from a pixel group which contains an objective pixel and neighboring pixels around the objective pixel, and an image filter to use for processing of the objective pixel is specified in accordance with the average density values. Using the specified image filter, filter computation is performed on a main signal which represents the density of the objective pixel, whereby an output signal is generated. The main signal which represents the objective pixel is smoothed out in an area which is larger than the size of halftone dots. In accordance with the average density values, a reference value is acquired. A set of weighting factors is selected based on the reference value, thereby determining an effective size of the image filter. The determined effective size is large in a density range where moires are noticeable. A predetermined filter computation portion executes computation based on the respective weighting factors of the image filter which has the determined effective size, to thereby generate a filtered signal. Such processing makes excellent suppression of a degraded image quality and removal of the moires possible, without deteriorating an edge of the image.