Rotationally symmetric coded data
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United States of America Patent
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Feb 26, 2008
Grant Date -
Sep 28, 2006
app pub date -
May 30, 2006
filing date -
Sep 17, 1999
priority date (Note) -
Expired
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Abstract
Coded data for disposal on or in a surface, the coded data being arranged in accordance with at least one layout having n-fold rotational symmetry about a center of rotation, where n is at least two, the layout including n identical sub-layouts rotated 1/n revolutions apart about the center of rotation, each sub-layout encoding a codeword formed from a number of data elements, the sub-layout defining the position of the data elements, and including rotation-indicating data that distinguishes that sub-layout from at least one other sub-layout.
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