Digital watermark embedding apparatus for document, digital watermark extraction apparatus for document, and their control method

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...

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Bibliographic Details
Main Author TAMARU JUN
Format Patent
LanguageEnglish
Published 12.09.2006
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
HANDLING RECORD CARRIERS
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Summary: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 ( 11 ), and watermark information is input from a watermark information input unit ( 15 ). A region division unit ( 12 ) divides the document image into regions, and a circumscribing rectangle extraction unit ( 13 ) sets circumscribing rectangles for characters and extracts them as character images. A punctuation mark determination unit ( 14 ) determines a punctuation mark from the character image. A watermark information embedding unit ( 16 ) embeds watermark information by digital watermarking that shifts character images other than the character image determined to be a punctuation mark.
Bibliography:Application Number: US20030351997