Image analysis – Applications
Reexamination Certificate
2011-01-18
2011-01-18
Perungavoor, Sath V (Department: 2624)
Image analysis
Applications
C713S176000, C380S252000, C380S287000, C380S054000, C380S055000, C358S001110, C358S464000
Reexamination Certificate
active
07873183
ABSTRACT:
A watermark embedding method for embedding a secret message sequence in a document. The techniques include obtaining layout information of the document, extracting a digest of the document by using a Hash function, calculating embedded positions where the secret message sequence is embedded in the document, and dispersedly hiding the secret message sequence in each of the calculated embedded positions by altering the layout of the document. Also provided is a watermark embedding apparatus, a corresponding watermark detecting method and apparatus, and a method and system for detecting document integrity. The integrity of documents in various forms can be detected, and secret information to be hidden can be embedded therein and extracted therefrom. The techniques described are not limited to the document either in soft copy or in hard copy and have good robustness.
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patent: 5949885 (1999-09-01), Leighton
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patent: 6804374 (2004-10-01), Beattie et al.
Berghel, “Watermarking cyberspace”, Nov. 1997, Communications of the ACM archive, vol. 40, Issue 11, pp. 19-24.
He Yuan
Luo Lin
Shao Ling
Su Ming
Xiang Zhe
Heidemann Jason
International Business Machines - Corporation
Perungavoor Sath V
Stock William
Tuchman Ido
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