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METHOD OF IMAGING POSITION-CODING PATTERN HAVING TAG COORDINATES ENCODED BY BIT-SHIFTED SUBSEQUENCES OF CYCLIC POSITION CODE

  • US 20100086209A1
  • Filed: 08/11/2009
  • Published: 04/08/2010
  • Est. Priority Date: 10/02/2008
  • Status: Abandoned Application
First Claim
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1. A method of decoding a position-coding pattern disposed on a surface of a substrate, said method comprising the steps of:

  • (a) operatively positioning an optical reader relative to said surface and capturing an image of a portion of said coding pattern, said coding pattern comprising;

    a plurality of tags, each tag encoding a w-bit subsequence of a cyclic code sequence, said w-bit subsequence mapping to a corresponding coordinate codeword for said tag, wherein adjacent tags contain w-bit subsequences shifted by one bit relative to each other in the cyclic code sequence;

    (b) sampling a windowed subsequence contained in said imaged portion;

    (c) identifying a coordinate codeword using said windowed subsequence; and

    (d) determining a position of the optical reader from said coordinate codewordwherein said imaged portion has a diameter of more than one tag diameter and less than two tag diameters.

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