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Scan image target locator system for calibrating a printing system

  • US 5,642,202 A
  • Filed: 12/01/1994
  • Issued: 06/24/1997
  • Est. Priority Date: 12/01/1994
  • Status: Expired due to Term
First Claim
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1. A system for calibrating a printing system, comprising:

  • a printer;

    a master test image document printed by said printer, said master test image having three locator symbols and a plurality of test objects, each symbol having a distinct apex, the apexes being non-colinear;

    scanning means for scanning said master test image document;

    symbol means for detecting the locator symbols printed on said master test image document and for generating transition data therefrom;

    coordinate means for determining a coordinate value for each non-colinear apex based on the transition data;

    memory means for prestoring image data corresponding to the test objects printed on said master test image document and positional data corresponding to a desired coordinate value for each non-colinear apex;

    transformation means for generating a transformation matrix based on a difference between the determined coordinate value for each non-colinear apex and the desired coordinate value for each non-colinear apex;

    position compensation means for retrieving prestored image data corresponding to the scanned image data based on the transformation matrix; and

    calibration means for comparing scanned image data with the retrieved prestored image data and for generating compensation values based on a difference between the scanned image data and the prestored image data.

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