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Method and device for decoding a position-coding pattern

  • US 7,999,798 B2
  • Filed: 09/14/2006
  • Issued: 08/16/2011
  • Est. Priority Date: 10/29/2001
  • Status: Active Grant
First Claim
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1. A method of coding positions in two dimensions on a surface, comprising:

  • coding positions along an x-axis using a first difference number sequence having the property that each partial sequence of a predetermined length has an unambiguously determined place within the first difference number sequence, each position along the x-axis being coded by one of said partial sequences,coding positions a long a y-axis using a second difference number sequence having the property that each partial sequence of a predetermined length has an unambiguously determined place within the second difference number sequence, each position along the y-axis being coded by one of said partial sequences,coding the numbers of the first difference number sequence by differences in circular shifts between instances of a first main number sequence running orthogonally to the first difference number sequence; and

    coding the numbers of the second difference number sequence by differences in circular shifts between instances of a second main number sequence running orthogonally to the second difference sequence.

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