A method of imaging a coding pattern disposed on a surface of a substrate. The method includes the steps of: (a) capturing an image of a portion of the coding pattern; and (b) low-pass filtering the captured image so as to obscure data elements in the image and preserve target elements in the image....http://www.google.fr/patents/US7913923?utm_source=gb-gplus-shareBrevet US7913923 - Method of imaging a coding pattern with data elements encoding by pulse-position modulation
Method of imaging a coding pattern with data elements encoding by pulse ...
