Orientation-indicating cyclic positional codes
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United States of America Patent
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-
Oct 7, 2008
Grant Date -
Dec 23, 2004
app pub date -
Jul 19, 2004
filing date -
Oct 25, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Machine-readable coded data disposed on or in a substrate. The coded data includes a plurality of layouts, each of which has order n rotational symmetry. The layout encodes a first codeword formed from a sequence of n first symbols distributed at n locations about the center of rotational symmetry of the layout. In use, decoding the first symbols at each of the n orientations of the layout produces n representations of the first codeword, with each representation being a different cyclic shift of the first codeword so as to indicate the degree of rotation of the layout. The layout also encodes a second codeword formed from a number of second symbols, the second codeword being indicative of information regarding the respective layout.
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