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Coding pattern with data elements encoding by pulse-position modulation

  • US 7,604,182 B2
  • Filed: 02/05/2008
  • Issued: 10/20/2009
  • Est. Priority Date: 02/08/2007
  • Status: Expired due to Fees
First Claim
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1. A substrate having a coding pattern disposed on a surface thereof, said coding pattern comprising:

  • a plurality of target elements defining a target grid, said target grid comprising a plurality of cells, wherein each cell has a target element positioned at each corner thereof and neighboring cells share target elements;

    a plurality of data elements contained in each cell; and

    a plurality of tags, each tag being defined by a plurality of contiguous cells, each tag comprising respective local tag data encoded by a respective set of said data elements,wherein said data elements encode data values by pulse position modulation.

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