METHOD OF IMAGING CODING PATTERN COMPRISING TAGS WITH DIVIDED X AND Y COORDINATE DATA

A method of imaging a coding pattern disposed on a surface of a substrate. The method comprises the steps of: (a) operatively positioning an optical reader relative to the surface and capturing an image of a portion of the coding pattern; (b) sampling and decoding x-coordinate data and y-coordinate data contained in the imaged portion; and (c) determining a position of the pen. The imaged portion has a diameter of at least one tag diameter and less than two tag diameters. The x-coordinate data and y-coordinate are each replicated in the tag.