Multiple watermarking techniques

Details Multiple watermarking techniques Multiple watermarking techniques

G - Physics

06

T

G06T 1/00 (2006.01)

Patent

CA 2666703

Multiple digital watermarks, each of which has different characteristics, are embedded in a document. The characteristics of the various watermarks are chosen so that each of the watermarks will be affected in a different manner if the document is subsequently copied and reproduced. The detection process or mechanism reads each of the watermarks and compares their characteristics. While wear and handling may change the characteristics of the digital watermarks in a document, the relationship between the characteristic of multiple digital watermarks in a document will nevertheless give an indication as to whether a document is an original or a copy of an original.

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