Method and device for the recording of body movements
The invention relates to a method for recording the position, location or movement of a body part of a patient and a device for recording the position, location or movement of a body part or a medical instrument. According to the invention, a graphic marker is connected with the body part or the instrument and an image of the body comprising the graphic marker is generated by an image recording camera ( 5, 6, 7 ). The image is processed by a processor device ( 14 ) as an image file. The invention is characterized in that at least one geometric size characteristic of the graphic marker is known, wherein the processor device ( 14 ) determines the position, location and/or movement of the graphic marker in the three-dimensional space and in a quantitative manner relative to the image recording camera ( 5, 6, 7 ) by means of the known size characteristic. The invention offers, without the need of manual calibration of the measuring system, a substantial automatization and a high measuring precision during the determination of position and movement in the three-dimensional space. Simultaneously, the expenditure on equipment can be reduced and the reaction to the object or body part to be measured or to the patient can be minimized.
1. A method for recording of position, location or movement of at least one body part of a patient arranged in an object space by means of electronic image recognition using at least one image recording camera, the method comprising the following process steps:
a) connecting at least one graphic marker carrier with the at least one body part, the at least one graphic marker carrier comprising a first marker area and a second marker area, the first marker area comprising a plurality of first graphic markers which are disposed in a first plane on a first surface of the at least one graphic marker carrier and the second graphic marker area comprising a plurality of second graphic markers which are disposed in a second plane on a second surface of the at least one graphic marker carrier, wherein the first plane and the second plane are arranged obliquely relative to one another;
b) generating an image of at least the area of the at least one body part containing the at least one graphic marker carrier by means of the at least one image recording camera;
c) transferring the image as an image file into an electronic processor device;
d) in the image space of the image file, localizing the first and/or second graphic markers contained in the image file by means of an application of an automated image recognition procedure to the image file;
e) determining of position and/or location of the first and/or second graphic markers in the object space relative to the at least one image recording camera by means of data generated in the automated image recognition procedure; and
f) transferring the determined data regarding position and/or location of the first and/or second graphic markers in the object space into a data storage, wherein
during the automated image recognition procedure, a known distance between the first graphic markers and/or between the second graphic markers is considered, or wherein
each of the first graphic markers and each of the second graphic markers comprises or defines a circular region, or wherein
the first graphic markers are arranged in a first linear arrangement and the second graphic markers are arranged in a second linear arrangement.
2. The method according to claim 1 , wherein the automated image recognition procedure comprises performing a Hough transformation.
3. The method according to claim 1 , wherein a first image recording camera is associated with the first marker area and a second image recording camera is associated with the second marker area.
4. The method according to claim 3 , wherein the first image recording camera and the second image recording camera are connected to a common camera mounting frame.
5. The method according to claim 4 , wherein the first image recording camera and the second image recording camera are fixed in position relative to the camera mounting frame.
6. The method according to claim 1 , wherein the first plane and the second plane are disposed perpendicularly with respect to each other.
7. The method according to claim 1 , wherein the first surface and the second surface are directly connected with one another.
8. A device for recording of position, location or movement of at least a component of the body of a patient or a medical instrument, the device comprising at least one graphic marker carrier connectable with the component and at least one image recording camera, wherein the at least one graphic marker carrier comprises a first marker area and a second marker area, the first marker area comprising a plurality of first graphic markers which are disposed in a first plane on a first surface of the at least one graphic marker carrier and the second graphic marker area comprising a plurality of second graphic markers which are disposed in a second plane on a second surface of the at least one graphic marker carrier, wherein the first plane and the second plane are arranged obliquely relative to one another, wherein the at least one image recording camera is equipped for generation of at least an image of the component comprising the at least one graphic marker carrier, the device further comprising a processor device for automated processing of image information contained in the image, wherein the processor device is equipped for determination of position, location and/or movement path of the first and/or second graphic markers relative to the image recording camera by means of data generated by the processor device, wherein
the processor device is configured to consider a known distance between the first graphic markers and/or between the second graphic markers during the automated processing of image information, or wherein
each of the first graphic markers and each of the second graphic markers comprises or defines a circular region, or wherein
the first graphic markers are arranged in a first linear arrangement and the second graphic markers are arranged in a second linear arrangement.
9. The device according to claim 8 , wherein the processor device is configured to apply a Hough transformation to the image.
10. The device according to claim 8 , wherein a first image recording camera is associated with the first marker area and a second image recording camera is associated with the second marker area.
11. The device according to claim 10 , wherein the first image recording camera and the second image recording camera are connected to a common camera mounting frame of the device.
12. The device according to claim 11 , wherein the first image recording camera and the second image recording camera are fixed in position relative to the camera mounting frame.
13. The device according to claim 8 , wherein the first plane and the second plane are disposed perpendicularly with respect to each other.
14. The device according to claim 8 , wherein the first surface and the second surface are directly connected with one another.