| 摘要 |
A substrate having a coding pattern disposed on a surface thereof. The coding pattern comprises a plurality of contiguous tags, each tag 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. A plurality of data elements are contained in each tag. The x-coordinate data is represented by a respective set of data elements and the y-coordinate data is represented by a respective set of data elements. The x-coordinate data has two replications within a respective tag, a first replication in a western half of the tag and a second replication in an eastern half of the tag. The y-coordinate data has two replications within a respective tag, a first replication in a northern half of the tag and a second replication in a southern half of the tag. Fragments of the coordinate data are arranged such that any tag-sized portion of the coding pattern is guaranteed to contain the x-coordinate data and the y-coordinate data for a tag irrespective of whether a whole tag is contained in the portion.
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