Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2011-08-09
2011-08-09
Park, Chan S (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C382S100000, C713S176000, C380S054000, C380S055000, C380S200000, C380S201000, C380S216000, C283S113000
Reexamination Certificate
active
07995246
ABSTRACT:
The present invention is concerned with detection of a “fragile watermark” in a printed image to aid in a determination whether a document under examination is an original or a copy. The watermark may be applied by phase-space encoding data to be included in the watermark. The image may be examined on a block-by-block basis after scanning. Correlation of detected watermark strength with block brightness and/or with wave vectors used for encoding may be used to detect that the image is a copy.
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Cordery Robert A.
Haas Bertrand
Zeller Claude
Malandra, Jr. Charles R.
Park Chan S
Pitney Bowes Inc.
Shapiro Steven J.
Zheng Jacky X
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