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CODING PATTERN COMPRISING REGISTRATION CODEWORD HAVING VARIANTS CORRESPONDING TO POSSIBLE REGISTRATIONS

  • US 20110180613A1
  • Filed: 01/27/2010
  • Published: 07/28/2011
  • Est. Priority Date: 01/27/2010
  • Status: Active Grant
First Claim
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1. A substrate having a coding pattern disposed thereon or therein, said coding pattern comprising:

  • a tiling of contiguous grid cells, each grid cell being demarcated by t target elements and having t-fold rotational symmetry, each grid cell containing nt registration symbols, each registration symbol being encoded by a set of macrodots; and

    a tiling of contiguous tags, each tag consisting of an array of c grid cells, each tag containing a plurality of data symbols and having an identical layout of data symbols, each data symbol being encoded by a set of macrodots;

    wherein;

    the coding pattern has a physical layout defined by its tiling of contiguous grid cells, said physical layout belonging to a plane symmetry group that has t-fold rotational symmetry and translational symmetry with the grid cell as its unit cell;

    the coding pattern has a logical layout defined by its tiling of contiguous tags, said logical layout belonging to a plane symmetry group that has no rotational symmetry but has translational symmetry with the tag as its unit cell;

    there are ct possible registrations between the physical layout of the coding pattern and the logical layout of the coding pattern, each registration corresponding to a distinct combination of one of the t possible rotations of the physical layout of coding pattern relative to the logical layout of the coding pattern and one of the c possible translations of the physical layout of the coding pattern relative to the logical layout of the coding pattern;

    any contiguous tag-shaped array of c grid cells contains cnt registration symbols, said registration symbols, taken in a defined sequence relative to the physical layout of the tag-shaped array, forming a registration codeword of length r;

    there are v distinct registration codewords, each corresponding to a distinct one of the ct possible registrations;

    the registration codeword of each contiguous tag-shaped array of c grid cells thereby uniquely identifies a registration between said tag-shaped array and the logical layout of the coding pattern;

    t=is an integer value of 2 or more;

    c=is an integer value of 2 or more;

    n is an integer value of 1 or more;


    cnt≧

    r; and


    v≧

    ct.

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