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Method for reducing errors in a digitizer

  • US 5,373,117 A
  • Filed: 08/10/1992
  • Issued: 12/13/1994
  • Est. Priority Date: 08/10/1992
  • Status: Expired due to Term
First Claim
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1. A process for providing coordinate data representing a trace made on a digitizing device, comprising the following steps:

  • (a) making a trace on a digitizing device;

    (b) sampling the trace as it is made to obtain observed horizontal (x) and vertical (y) point values at observed times (t);

    (c) interpolating pairs of adjacent observed (x) point values to obtain an interpolated (x) point value to be associated with an observed (y) point value, said interpolated (x) point value being determined by multiplying the distance between the adjacent observed (x) point values by the ratio of the difference in times (t) between the first observed (x) point value and the observed (y) point value to the difference in times (t) between the two observed (x) point values; and

    (d) interpolating pairs of adjacent observed (y) point values to obtain an interpolated (y) point value to be associated with an observed (x) point value, said interpolated (y) point value being determined by multiplying the distance between the adjacent observed (y) point values by the ratio of the difference in times (t) between the first observed (y) point value and the observed (x) point value to the difference in times (t) between the two observed (y) point values.

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