Method for the marking of documents

Details Method for the marking of documents Method for the marking of documents

H - Electricity

04

N

H04N 1/23 (2006.01) G03G 21/00 (2006.01) G03G 21/04 (2006.01) H04N 1/00 (2006.01)

Patent

CA 2114548

2114548 9325038 PCTABS00028 A mark is incorporated to the original during the fabrication of said original in such a way that said mark is invisible on the original but appears on the copy of the original which is made by using a photocopying machine. The mark is incorporated by additionnally mixing the original image to be protected and the marking image to be concealed in the original by modulating one or the other of the images or by manipulation of Fourier transforms.

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