Rotationally symmetric tags
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United States of America Patent
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Jun 23, 2009
Grant Date -
Jul 6, 2006
app pub date -
Dec 3, 2002
filing date -
Dec 3, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Machine-readable coded data disposed on or in a substrate in accordance with a layout, and method of generating such coded data, The layout has six-fold rotational symmetry and includes 6 identical sub-layouts rotated ⅙ revolutions apart about a center of rotational symmetry of the layout. The coded data is disposed in accordance with each sub-layout including rotation-indicating data that distinguishes the rotation of that sub-layout from the rotation of at least one other sub-layout within the layout. In one embodiment, the symbols of the sub-layouts are interleaved with each other
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