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:
Nov. 04, 2003
Filed:
Aug. 03, 1999
Kagumi Moriwaki, Itami, JP;
Minolta Co., Ltd., Osaka, JP;
Abstract
This invention relates to image correction device and image correction method for compensating both the contrast and the brightness of the original image, suppressing the contrast enhancement, improving the lightness, and transforming an image with extremely bright areas or extremely dark areas into an image with correct contrast and lightness. To correct the contrast, the original image is divided into a plurality of areas, a histogram fabricated to show the frequency distribution for the pixel lightness in each area and a lightness mapping curve made for the accumulated value. The pixel lightness for each area within the image is converted based on the lightness mapping curve. To correct the lightness of the original image, the average lightness is compensated when determined to be extremely bright or extremely dark.