Patent ID: 8320678
Filing Date: 2012-11-27
Classification: G06F,G06K,G06T

Abstract:
1. A substrate having a coding pattern disposed on a surface thereof, said coding pattern comprising: a plurality of contiguous tags, each tag comprising x-coordinate data and y-coordinate data, wherein a y-axis is nominally defined as north-south and an x-axis is nominally defined as east-west; and a plurality of data elements contained in each tag, said x-coordinate data being represented by a respective set of data elements and said y-coordinate data being represented by a respective set of data elements, wherein: said x-coordinate data has two replications within a respective tag, a first replication in a western half of said tag and a second replication in an eastern half of said tag; and said y-coordinate data has two replications within a respective tag, a first replication in a northern half of said tag and a second replication in a southern half of said tag, and wherein fragments of said coordinate data are arranged such that any tag-sized portion of said coding pattern is guaranteed to contain said x-coordinate data and said y-coordinate data for a tag irrespective of whether a whole tag is contained in said portion.