Rotationally symmetric tags
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United States of America Patent
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Sep 19, 2006
Issued Date -
N/A
app pub date -
Dec 4, 2002
filing date -
Sep 17, 1999
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 at least order n rotational symmetry, where n is at least two, and includes n identical sub-layouts rotated 1/n 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.
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