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:
Feb. 19, 2008
Filed:
Nov. 22, 2004
Shinichi Takarada, Niihama, JP;
Shinichi Takarada, Niihama, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An image processing method comprises forming a histogram of an entire image, determining a ratio between a reference luminance value and a reference threshold value at a maximum frequency, dividing the image into local areas, forming a histogram of each local area, determining a luminance value at a maximum frequency, multiplying this luminance value by the ratio between the reference luminance value and the reference threshold value to obtain a threshold value of the local area, and performing binarization for the local area using the threshold value. Therefore, it is possible to determine an appropriate threshold value in each local area of a multiple gray-level image, and obtain, using this threshold value, a binarized image which enables accurate separation of an object from a background.