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:
Sep. 12, 2006
Filed:
Jan. 28, 2003
Jun Tamaru, Tokyo, JP;
Jun Tamaru, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention provides a digital watermark embedding apparatus for a document, which can eliminate unnaturalness that may be experienced upon laying out characters in a document when watermark information is embedded, while maintaining the robustness of a document itself and the information size to be embedded of a digital watermark. A document image is input from an image input unit (), and watermark information is input from a watermark information input unit (). A region division unit () divides the document image into regions, and a circumscribing rectangle extraction unit () sets circumscribing rectangles for characters and extracts them as character images. A punctuation mark determination unit () determines a punctuation mark from the character image. A watermark information embedding unit () embeds watermark information by digital watermarking that shifts character images other than the character image determined to be a punctuation mark.