Patent ID: 9462993
Filing Date: 2016-10-11
CPC Classification: A61B,A61C,G01B,G06T,G09B

Claim Text:
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.