Method for robust asymmetric modulation spatial marking with...

Details Method for robust asymmetric modulation spatial marking with... Method for robust asymmetric modulation spatial marking with...

2003-09-19

2009-02-17

Bali, Vikkram (Department: 2624)

Image analysis

Applications

C382S299000, C382S293000, C345S696000, C358S001900, C283S902000

Reexamination Certificate

active

07492920

ABSTRACT:
Example embodiments relate to a method for applying a special mark, that is invisible to the naked eye, on a medium. That is, the example embodiments provide a method for generating and applying on a medium a digital spatial mark of X×Y dots in accordance with a resolution of d1xby d1ydots per surface unit, provided that the ratio d1x/d2xand or d1y/d2yis more than 1. The method further includes over-sampling the digital spatial mark in X based on a factor nx=d1x/d2xand in Y based on a factor ny=d1y/d2y; eroding the dots to be applied so as to leave one dot every nx dots in X and one dot every nx dots in Y; and applying the spatial mark on the support.

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