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:
Jun. 02, 2009
Filed:
Jan. 07, 2008
Shigeru Mizoguchi, Kanagawa, JP;
Naohisa Suzuki, Kanagawa, JP;
Shigeru Mizoguchi, Kanagawa, JP;
Naohisa Suzuki, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention has as its object to detect an image area of interest in an image file by a method with a lighter processing load by making determination using characteristics of a quantization table. Since spatial frequency information, chromaticity information, and a quantization table are acquired for respective predetermined blocks from inputted compressed image data, and are used in combination upon searching the compression-recorded image data for an image of interest, information containing AC component information for each image data block is acquired without any advanced calculations, thus searching for the image of interest in the image file.