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:
Jul. 29, 2008
Filed:
Mar. 17, 2004
Kazuyo Watanabe, Tokyo, JP;
Kazuyo Watanabe, Tokyo, JP;
Oki Data Corporation, Tokyo, JP;
Abstract
An image processing method of making luminance correction on the basis of a luminance histogram showing luminance level distribution of image data expressing an image by a numerical value. A luminance average value, a luminance standard deviation, and a peak distance in the luminance histogram are obtained. A distribution discrimination value which can discriminate whether the luminance level distribution is deviated on the low/high luminance side in the histogram is compared with the peak distance. A halftone presence/absence discrimination value which can discriminate whether the luminance distribution is not deviated in the halftone in the luminance histogram is compared with the standard deviation. A backlight image is discriminated by the comparison results. An exposing state of an image other than a backlight image is discriminated by using an exposing state discrimination value. The proper luminance correction is made in accordance with the exposing state.