Patent ID: 7492920

Claim:
A method of generating and applying on a support of a digital spatial marking of X×Y points according to a resolution of d 1 x by d 1 y points per surface unit and intended to be read by a reading device with a resolution of d 2 x by d 2 y points per surface unit, taking into account that the ratio d 1 x /d 2 x and/or d 1 y /d 2 y is larger than 1, the method comprising: defining a pseudo-random digital mark in a resolution d 2 x by d 2 y, over-sampling the digital mark in X according to a factor nx=d 1 x /d 2 x and in Y according to a factor ny=d 1 y /d 2 y in order to obtain a digital mark according to a resolution d 1 x by d 1 y, eroding the X×Y points intended to be applied so as to guarantee that a minimum distance between said X×Y points is respectively nx and ny in horizontal and vertical directions, and applying the digital spatial marking on the support.