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Orientation-indicating machine readable coded data

  • US 6,929,186 B2
  • Filed: 07/19/2004
  • Issued: 08/16/2005
  • Est. Priority Date: 10/25/2002
  • Status: Expired due to Fees
First Claim
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1. Machine-readable coded data disposed on or in a substrate, the coded data including a layout having order n rotational symmetry, where n is at least two, the layout having n identical sub-layouts rotated 1/n revolutions apart about a center of rotation, the layout encoding a first codeword comprising a sequence of an integer multiple m of n first symbols, where m is one or more, with each sub-layout defining respective positions for each of m first symbols such that the m first symbols uniquely identify each sub-layout, and such that decoding the first symbols provided at one or more of the respective locations within each sub-layout is indicative of the degree of rotation of the layout.

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