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Digital data reader of digital data recording sheet

  • US 5,408,543 A
  • Filed: 06/17/1994
  • Issued: 04/18/1995
  • Est. Priority Date: 08/02/1989
  • Status: Expired due to Term
First Claim
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1. A system for locating and reading digital data in data regions within a data field on a surface and compensating for optical or physical distortions of the data field viewed by an optical reader comprising:

  • means for defining the data field by providing x-axis and y-axis intersecting basic lines disposed at a predetermined angle with respect to each other and a corner mark on said surface, the corner mark together with the basic lines defining a data field therebetween;

    means for defining the positions of a plurality of imaginary x-axis internal lines within said data field, said x-axis internal lines being spaced at predetermined distances from each other, said x-axis internal lines being disposed at predetermined angles with respect to said y-axis basic line;

    means for defining the positions of a plurality of imaginary y-axis internal lines within said data field, said y-axis internal lines being spaced at predetermined distances from each other, said y-axis internal lines being disposed at predetermined angles with respect to said x-axis basic line;

    means for calculating the location of the points of intersection of the imaginary x and y axis internal lines at the time of reading said data from the angle between the x and y axis basic line, the angles of the x-axis internal lines with respect to the y-axis basic line, and the angles of the y-axis internal lines with respect to the x-axis basic line;

    means for locating said data regions within said data field from the calculated locations of the points of intersection of the x and y axis internal lines at the time of reading; and

    means for reading the digital data within said data regions;

    whereby optical and physical distortions of the locations of the x and y axis basic lines, and corner mark are compensated for at the time of reading the data in order to accurately locate positions of the data regions within the data field.

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