Orientation-indicating machine readable coded data
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United States of America Patent
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Aug 16, 2005
Issued Date -
N/A
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 layout having order n rotational symmetry, formed from n identical sub-layouts rotated 1/n revolutions apart about a center of rotation. The layout encodes a first codeword formed from a sequence of a multiple m of n first symbols, with each sub-layout defining respective positions for each of m first symbols, such that the m first symbols uniquely identify each sub-layout. Decoding the first symbols provided at one or more of the respective locations within each sub-layout is therefore indicative of the degree of rotation of the layout.
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