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. 03, 2004
Filed:
Oct. 13, 2000
Masato Nakajima, Ibaraki-ken, JP;
Riso Kagaku Corporation, Tokyo, JP;
Abstract
In an image processing device ( ), when receiving image data transferred from, for example a digital camera through an image input section ( ), the region division section ( ) divides the image data into a plurality of blocks having optimum sizes according to a degree of a similarity between density histograms of the blocks. A contrast enhancement section ( ) obtains an optimum clip value per divided block and then obtains a density conversion curve based on the density histogram of the block including a target pixel by using the clip value in order to perform the density conversion for all of the pixels optimally. The image data that have been enhanced in contrast are compensated by a read compensation section ( ) according to a property of a printing device ( ) and then printed on a paper sheet.