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. 07, 2008
Filed:
Sep. 30, 2003
Hiroyuki Urushiya, Saitama, JP;
Hiroyuki Urushiya, Saitama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image processing apparatus and method can perform gradation conversion of an image in which flatness of a pixel-value histogram of an image after gradation conversion is excellent, while using a specific gradation conversion function. A gradation conversion function represented using variables for specifying a gradation conversion characteristic is used. The values of the variables are determined based on flatness of a pixel-value histogram of an image obtained by converting an object image with the gradation conversion function. The object image is subjected to gradation conversion with the gradation conversion function determined by the determined values of the variables.