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, 2014
Filed:
Dec. 20, 2011
Yoichiro Makino, Kawasaki, JP;
Yoichiro Makino, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image correcting method for an image processing apparatus that reads a bound document and corrects a shadow in a bound portion in obtained document image data includes extracting shadow image data from the document image data, generating a grid with which a ratio of changes in luminance between the grid lines in directions perpendicular to each other is smaller than in a square grid and which has grid points within a capacity of a memory for correction values, calculating first correction values that corrects luminance of pixels in the shadow image data corresponding to grid points, storing the first correction values in the memory, calculating second correction values for luminance of the pixels in the shadow image data based on first correction values of grid points close to each pixel, and correcting luminance of the document image data using the first and second correction values.