Coding pattern with optimal number of target elements in each tag
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United States of America Patent
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Oct 4, 2011
Grant Date -
Aug 14, 2008
app pub date -
Feb 5, 2008
filing date -
Feb 8, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A substrate having a coding pattern disposed on a surface thereof is disclosed. The coding pattern has target elements defining a target grid. The target grid has cells, wherein neighboring cells share target elements. A plurality of data elements are contained in each cell. Tags are defined by a plurality of contiguous cells and each tag has respective local tag data encoded by a respective set of the data elements. Each tag has at least nine target elements, which facilitates accurate observation of a perspective distortion of the target elements.
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