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Machine readable coded data with target features

  • US 7,017,826 B2
  • Filed: 07/19/2004
  • Issued: 03/28/2006
  • 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 plurality of layouts, each layout having n identical sub-layouts rotated 1/n revolutions apart about a center of rotation, where n is at least two, each layout encoding a first codeword comprising a sequence of n first symbols, each sub-layout defining the position of a respective one of the first symbols such that the first codeword is indicative of the orientation of the layout, and each layout including a number target features for enabling a preliminary location and rotation of the layout to be determined by a machine used to read the coded data, at least some of the target features being shared by at least two of the layouts.

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