Embedding and extracting additional information in a...

Image analysis – Applications

Reexamination Certificate

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C382S190000, C358S003280

Reexamination Certificate

active

07630514

ABSTRACT:
Additional information is embedded to a document image by: analyzing a layout of a document image, the layout comprising a character line having a plurality of intercharacter spaces, each intercharacter space having an original length; and embedding additional information into the character line by changing the original length to an optimal length for each of the plurality of intercharacter spaces. The additional information may be further extracted from the document image.

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patent: 2002-344911 (2002-11-01), None
patent: 2004-023563 (2004-01-01), None
“Document Marking and Identification using both Line and Word Shifting,” S. Low, N. Maxemchuk, J. Brassil, L. O'Gorman, Proceedings of IEEE INFOCOM'95, Boston MA, Apr. 1995.
N. Chotikakamthorn. Electronic document data hiding technique using inter-character space. In Proc. of The 1998 IEEE Asia-Pacific Conference on Circuits and Systems, IEEE APCCAS 1998, pp. 419-422, Chiangmai, Thailand, Nov. 1998.

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