Registration method and registration device for a position detection system

1. A registration method for detecting the position and alignment of an object or body part in relation to a position detection system, wherein the method comprises the following steps:

arranging a reference sensor on the object or body part or on an image sensor unit,

detecting the position of the reference sensor by a position detection system,

performing a plurality of image recordings of a surface of the object or body part and of the reference sensor by an optical, monofocal image sensor unit,

photogrammetrically producing a surface model of the object or body part based on said plurality of recordings,

determining the position of the reference sensor in the surface model,

correlating the surface model with a coordinate system of the position detection system by an algorithm and based on the determined position of the reference sensor in the surface model and based on the position of the reference sensor detected by the position detection system.

2. The registration method as claimed in claim 1 , characterized in that the optical, monofocal image sensor unit is connected to a position sensor or comprises the latter, the position of which position sensor is detectable by the position detection system.

3. The registration method as claimed in claim 2 , characterized in that the image sensor unit is moved during the performing of image recordings of the surface of the object or body part and a respective location and alignment of the image sensor unit is detected by the position sensor on the image sensor unit.

4. The registration method as claimed in claim 3 , characterized in that a pattern is projected onto the surface of the object or body part for the purpose of producing the plurality of image recordings of the surface of the object or body part.

5. The registration method as claimed in claim 4 , characterized in that the pattern is projected by a pattern projector which is rigidly connected to the image sensor unit.

6. The registration method as claimed in claim 5 , characterized in that the pattern is projected by a pattern projector which is rigidly connected to a position sensor.

7. The registration method as claimed in claim 6 , characterized in that the pattern is projected using infrared light and the image sensor unit comprises an infrared-sensitive image sensor.

8. The registration method as claimed in claim 7 , characterized in that a 3-D camera is used as an image sensor unit.

9. The registration method as claimed in claim 8 , characterized in that use is made of a plurality of position sensors at different places or of a movable position sensor which is moved during the producing of the image recordings of the surface of the object or body part and the position of which sensor or sensors is likewise detected photogrammetrically in order to determine distortions of an alternating electromagnetic field of a position detection system.

10. The registration method as claimed in claim 1 , characterized in that the at least one image sensor unit is moved during the producing of the image recordings of the surface of the object or body part and a respective location and alignment of the at least one image sensor unit is detected by the position sensor on the at least one image sensor unit.

11. The registration method as claimed in claim 1 , characterized in that a pattern is projected onto the surface of the object or body part for the purpose of producing the plurality of image recordings of the surface of the object or body part.

12. The registration method as claimed in claim 11 , characterized in that the pattern is projected by a pattern projector which is rigidly connected to the at least one image sensor unit.

13. The registration method as claimed in claim 12 , characterized in that the pattern is projected by a pattern projector which is rigidly connected to a position sensor.

14. The registration method as claimed in claim 11 , characterized in that the pattern is projected using infrared light and the at least one image sensor unit comprises an infrared-sensitive image sensor.

15. The registration method as claimed in claim 1 , characterized in that a 3-D camera is used as an image sensor unit.

16. The registration method as claimed in claim 1 , characterized in that use is made of a plurality of position sensors at different places or of a movable position sensor which is moved during the producing of the image recordings of the surface of the object or body part and the position of which sensor or sensors is likewise detected photogrammetrically in order to determine distortions of an alternating electromagnetic field of a position detection system.

17. A device for performing a registration method for detecting the position and alignment of an object or body part in relation to a position detection system, wherein the device comprises:

a position detection system,

a reference sensor arranged on the object or body part or on an image sensor unit,

at least one position sensor, the position and alignment of which is detectable by the position detection system,

wherein the image sensor unit is an optical, monofocal image sensor unit,

wherein the position sensor is to be connected to a surface to be detected or is connected to the image sensor unit,

wherein the image sensor unit is configured to perform a plurality of image recordings of a surface of the object or body part and of the position sensor so as to photogrammetrically produce a surface model of the object or body part based on said plurality of recordings, and so as to determine the position of the position sensor in the surface model, and wherein the position detection system is configured to correlate the surface model with a coordinate system of the position detection system by an algorithm and based on the determined position of the reference sensor in the surface model and based on the position of the reference sensor detected by the position detection system.

18. The device as claimed in claim 17 , characterized in that the device additionally comprises a pattern projector which is connected to the at least one image sensor unit and/or a position sensor and/or comprises one of the latter.

19. The device as claimed in claim 17 , characterized in that the at least one image sensor unit is a 3-D camera.