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Dynamically variable machine readable binary code and method for reading and producing thereof

  • US 5,479,004 A
  • Filed: 06/23/1994
  • Issued: 12/26/1995
  • Est. Priority Date: 05/05/1988
  • Status: Expired due to Term
First Claim
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1. Apparatus for reading a machine readable code having a perimeter and containing a plurality of data elements in a two-dimensional spatial array representing coded information, comprising:

  • means for sensor scanning a visual field to capture a two-dimensional image of the visual field;

    means for converting a scanned visual field image into a bit map representing the scanned visual field;

    first processing means for processing the bit map to locate and determine a size indicia in the bit map, the size indicia indicating the size of the code and comprising a first solid line and a second solid line, the first and second solid lines intersecting at a first corner and forming a portion of the code perimeter;

    second processing means for processing the bit map, in response to locating the size indicia, to locate and determine a density indicia in the bitmap, the density indicia comprising a first pattern of alternating light areas and dark areas and a second pattern of alternating light areas and dark areas, the first and second patterns intersecting at a second corner and forming another portion of the code perimeter, the product of the numbers of alternating light areas and dark areas in the first and second patterns indicating the number of data elements in the code representing coded information; and

    third processing means responsive to the determined size indicia and density indicia, for processing the bitmap and determining the coded information in the plurality of data elements.

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