Method and device for generating at least one virtual image of a measurement object

Patent metadata

Field	Value
Publication number	US-9721345-B2
Application number	US-201414894121-A
Country	US
Kind code	B2
Filing date	May 26, 2014
Priority date	May 27, 2013
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

The invention relates to a method and a device for generating at least one virtual image of a measurement object, in which a virtual position and/or a virtual orientation of the measurement object is determined and a virtual position and/or virtual orientation of at least one imaging or image recording device of a coordinate measuring machine is determined. The virtual image is generated on the basis of geometric data of the measurement object and on the basis of optical properties of the measurement object and the virtual image is additionally generated on the basis of imaging parameters of the imaging or image recording device.

First claim

The invention claimed is:

1. A method for determining adjustable parameters of a plurality of coordinate measurement machines, the method comprising the following steps:
generating at least one virtual image of a measurement object;
determining at least one of a virtual position or a virtual orientation of the measurement object;
determining at least one of a virtual position or a virtual orientation of at least one imaging device of a coordinate measurement machine;
generating the virtual image as a function of geometric data of the measurement object and as a function of optical properties of the measurement object;
additionally generating the virtual image as a function of imaging parameters of the at least one imaging device;
generating the virtual image with normalized adjustable parameters; and
determining corresponding parameters being adjustable for actual measurement for each of the plurality of coordinate measurement machines as a function of the normalized parameters.

2. The method according to claim 1 , which further comprises determining at least one of a virtual position or a virtual orientation of at least one light source, and additionally determining the virtual image as a function of emission parameters of the at least one light source.

3. The method according to claim 2 , which further comprises adjusting at least one adjustable parameter of at least one of the at least one light source or the coordinate measurement machine or the at least one imaging device as a function of a corresponding parameter used to generate the virtual image.

4. The method according to claim 1 , wherein the imaging parameters of the at least one imaging device include imaging parameters of at least one optical element of the at least one imaging device.

5. The method according to claim 1 , which further comprises determining at least one of the virtual position or the virtual orientation of the measurement object or of the at least one imaging device as a function of at least one of virtual motion parameters of at least one movable part of the coordinate measurement machine or as a function of geometric data of the coordinate measurement machine.

6. The method according to claim 1 , which further comprises additionally determining the virtual image as a function of sensor parameters of an image sensor of the at least one imaging device.

7. The method according to claim 1 , which further comprises applying at least one image processing method to the virtual image after generation of the virtual image, the image processing method simulating at least one aberration of the at least one imaging device.

8. The method according to claim 7 , which further comprises applying at least one smoothing filter operation to the virtual image after generation of the virtual image, and selecting a strength of the at least one smoothing filter operation as a function of a distance of a point, imaged in one or more pixels, on the measurement object, from a focal plane of the at least one imaging device.

9. The method according to claim 1 , which further comprises determining a focal plane of the at least one imaging device, the virtual image corresponding to a part of the virtual measurement object disposed in the focal plane or in a predetermined region around the focal plane.

10. The method according to claim 1 , which further comprises determining a measurement accuracy of a coordinate measuring machine as a function of the virtual image.

11. The method according to claim 1 , which further comprises comparing a measurement accuracy of methods for image-based measurement of a measurement object, as a function of the virtual image.

12. A non-transitory computer program product, comprising a code stored in or on the computer program product for carrying out a method according to claim 1 .

13. A method for generating at least one virtual image of a measurement object, the method comprising the following steps:
determining at least one of a virtual position or a virtual orientation of the measurement object;
determining at least one of a virtual position or a virtual orientation of at least one imaging device of a coordinate measurement machine;
generating the virtual image as a function of geometric data of the measurement object and as a function of optical properties of the measurement object;
additionally generating the virtual image as a function of imaging parameters of the at least one imaging device; and
additionally determining the virtual image as a function of sensor parameters of an image sensor of the imaging device.

14. The method according to claim 13 , which further comprises determining at least one of a virtual position or a virtual orientation of at least one light source, and additionally determining the virtual image as a function of emission parameters of the at least one light source.

15. The method according to claim 14 , which further comprises adjusting at least one adjustable parameter of at least one of the at least one light source or the coordinate measurement machine or the at least one imaging device as a function of a corresponding parameter used to generate the virtual image.

16. The method according to claim 13 , wherein the imaging parameters of the at least one imaging device include imaging parameters of at least one optical element of the at least one imaging device.

17. The method according to claim 13 , which further comprises determining at least one of the virtual position or the virtual orientation of the measurement object or of the at least one imaging device as a function of at least one of virtual motion parameters of at least one movable part of the coordinate measurement machine or as a function of geometric data of the coordinate measurement machine.

18. The method according to claim 13 , which further comprises applying at least one image processing method to the virtual image after generation of the virtual image, the image processing method simulating at least one aberration of the at least one imaging device.

19. The method according to claim 18 , which further comprises applying at least one smoothing filter operation to the virtual image after generation of the virtual image, and selecting a strength of the at least one smoothing filter operation as a function of a distance of a point, imaged in one or more pixels, on the measurement object, from a focal plane of the at least one imaging device.

20. The method according to claim 13 , which further comprises determining a focal plane of the at least one imaging device, the virtual image corresponding to a part of the virtual measurement object disposed in the focal plane or in a predetermined region around the focal plane.

21. The method according to claim 13 , which further comprises determining a measurement accuracy of a coordinate measuring machine as a function of the virtual image.

22. The method according to claim 13 , which further comprises comparing a measurement accuracy of methods for image-based measurement of a measurement object, as a function of the virtual image.

23. A device for generating at least one virtual image of a measurement object, the device comprising:
at least one control and evaluation device configured to determine at least one of a virtual position or a virtual orientation of the measurement object and at least one of a virtual position or a virtual orientation of at least one imaging device of a coordinate measurement machine;
the measurement

Assignees

• Zeiss Carl Industrielle Messtechnik Gmbh

Inventors

• Engel Thomas
• Rieger Stephan

Classifications

• G09B23/06

  for physics · CPC title

• G09B19/24 Primary

  Use of tools · CPC title

• G06T7/30 Primary

  Determination of transform parameters for the alignment of images, i.e. image registration · CPC title

• G06T19/00

  Manipulating three-dimensional [3D] models or images for computer graphics · CPC title

• G06T15/50

  Lighting effects · CPC title