Coding pattern comprising tags with x and y coordinate data divided into respective halves of each tag

摘要

A substrate has disposed on a surface a coding pattern. The coding pattern includes a plurality of tags each comprising x-coordinate data and y-coordinate data. A y-axis is nominally defined as north-south and an x-axis is nominally defined as east-west. The coding pattern further includes a plurality of data elements contained in each tag. The x-coordinate data is represented by a first set of data elements and the y-coordinate data is represented by a second set of data elements. The first set of data elements includes two replications of the x-coordinate data, a first replication of the x-coordinate data positioned in a western half of said tag and a second replication of the x-coordinate data positioned in an eastern half of said tag. The first replication of the x-coordinate data is positioned within one tag distance of a second replication of x-coordinate data of an adjacent tag.