Title: Information embedding device, information detecting device, information embedding and detecting system, information embedding method, information detecting method, information embedding program, infor
Application Number: 200510072025 Application Date: 2005.05.26
Publication Number: 1704990 Publication Date: 2005.12.07
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G09C1/00,H04N1/387
Applicant(s) Name: Ricoh KK Address:
Inventor(s) Name:
Attorney & Agent: hao qiangfen
Abstract:
     An information embedding device is provided that embeds information in a document image having a character region therein. This information embedding device includes: a character region detecting unit that detects the character region from the document image; a character region dividing unit that divides the character region into a plurality of sub regions; and a feature quantity increasing/decreasing unit that performs an operation to increase or decrease a feature quantity with respect to each of the sub regions to a value that is determined from a pseudorandom number sequence in accordance with predetermined rules.
Time: 15
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