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Method and reference model for checking a measuring system

  • US 9,462,993 B2
  • Filed: 01/28/2013
  • Issued: 10/11/2016
  • Est. Priority Date: 01/27/2012
  • Status: Active Grant
First Claim
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1. A method of determining a calibration error in a measuring system, the method comprising:

  • recording a plurality of three-dimensional images of a reference object from a plurality of different image directions in a circuit along the reference object using the measuring system, wherein an object region of the reference object is imaged twice, at a start of the circuit and at an end of the circuit;

    registering each of the three-dimensional images with another of the three-dimensional images using a registration algorithm for the measuring system so that the three-dimensional images are combined into an overall image;

    determining a distance in the overall image between a first position of the object region in a three-dimensional image from the start of the circuit and a second position of the object region in a three-dimensional image from the end of the circuit;

    determining a total measuring error based on the distance in the overall image;

    determining a registration error of the measuring system from a deviation between an ideal virtual three-dimensional model of the reference object and another virtual model of the reference object generated by applying the registration algorithm for the measuring system to a plurality of virtual sub-regions of the ideal virtual three-dimensional model of the reference object; and

    determining a calibration error by subtracting the registration error from the total measuring error.

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