Image analysis – Pattern recognition – Template matching
Patent
1996-09-24
1998-03-31
Rogers, Scott
Image analysis
Pattern recognition
Template matching
382237, 358536, 358456, 380 54, 283113, G06K 974, H04N 1405, H04N 152
Patent
active
057347522
ABSTRACT:
A method for generating watermarks in a digitally reproducible document which are substantially invisible when viewed including the steps of: (1) producing a first stochastic screen pattern suitable for reproducing a gray image on a document; (2) deriving at least one stochastic screen description that is related to said first pattern; (3) producing a document containing the first stochastic screen; (4) producing a second document containing one or more of the stochastic screens in combination, whereby upon placing the first and second document in superposition relationship to allow viewing of both documents together, correlation between the first stochastic pattern on each document occurs everywhere within the documents where the first screen is used, and correlation does not occur where the area where the derived stochastic screens occur and the image placed therein using the derived stochastic screens becomes visible.
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Costello Mark
Rogers Scott
Xerox Corporation
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