Method and device for securing documents

Details Method and device for securing documents Method and device for securing documents

G - Physics

06

K

G06K 19/06 (2006.01) G03G 21/04 (2006.01) G07D 7/20 (2006.01)

Patent

CA 2688399

The invention relates to a method for securing documents that comprises the step of printing a distribution of points on said document, said printing inducing due to printing randomness a point-by-point unpredictable variation of at least one geometrical variation of the printed points and, before said printing step, the step of generating said point distribution so that the points of said distribution have at least one variable geometrical characteristic between them, the geometrical amplitude of the variation generated having the same magnitude as said unpredictable variation. In some embodiments, during the generation step and in said point distribution, at least one half of the points of said distribution are not laterally juxtaposed to four other points of said point distribution, and at least one dimension of at least a portion of the points of said point distribution has the same magnitude as the average of the absolute value of said unpredictable variation.

Le procédé de sécurisation d'un document comporte : - une étape d'impression d'une distribution de points sur ledit document, ladite impression provoquant, du fait d'aléas d'impression, une variation imprévisible, point par point, d'au moins une caractéristique géométrique des points imprimés et préalablement à ladite étape d'impression, une étape de génération de ladite distribution de points pour que des points de ladite distribution aient au moins une caractéristique géométrique variable entre eux, l'amplitude géométrique de la variation générée étant de l'ordre de grandeur de ladite variation imprévisible. Dans des modes de réalisation, au cours de l'étape de génération, dans ladite distribution de points : au moins la moitié des points de ladite distribution ne soit pas juxtaposés latéralement à quatre autres points de ladite distribution de points, et au moins une dimension d'au moins une partie des points de ladite distribution de points étant du même ordre de grandeur que la moyenne de la valeur absolue de ladite variation imprévisible.

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