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1. WO2021061704 - DETERMINING AND TRACKING MOVEMENT

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

WHAT IS CLAIMED IS:

1. An apparatus comprising:

a screen;

an imaging system configured to capture an image of the screen; and

a position indicating system that includes:

a housing;

a first light emitter disposed within the housing and oriented to emit light in a first direction toward the screen;

a second light emitter disposed within the housing and oriented to emit light in a second direction, the second direction being collinear with and opposite to the first direction; and

a third light emitter disposed within the housing and onented to emit light in a third direction, the third direction being different than the first direction and the second direction;

wherein the screen is disposed between the position indicating system and the imaging system.

2. The apparatus of claim 1 , wherein the third light emitter is positioned so that a line corresponding to the third direction intersects with a line corresponding to the first direction.

3. The apparatus of claim 2, wherein the third light emitter is oriented so that the third direction is perpendicular to the first direction.

4. The apparatus of claim 2, wherein the third light emitter is oriented to emit light toward the screen.

5. The apparatus of claim 4, wherein the third light emitter is oriented so that the third direction is offset from the first direction by an offset angle of less than 90 degrees.

6. The apparatus of claim 5, wherein the third light emitter is onented so that the third direction is offset from the first direction by an offset angle of less than 45 degrees.

7. The apparatus of claim 6, wherein the third light emitter is oriented so that the third direction is offset from the first direction by an offset angle of between 5 degrees and 15 degrees.

8. The apparatus of claim 6, wherein the third light emitter is oriented so that the third direction is offset from the first direction by an offset angle of less than 10 degrees.

9. The apparatus of any of claims 4-8, further comprising a motion determining device configured to process the image of the screen to determine motion of the imaging system based on identifying intersection points of light emitted by the first light emitter and light emitted by the third light emitter.

10. The apparatus of any of claims 1-9, further comprising a reference position indicating system that includes a reference light emitter configured to emit light toward the screen.

11. The apparatus of any of claims 1-10, wherein the screen is curved and the second light emitter being positioned and oriented to emit light toward the screen.

12 The apparatus of claim 11, wherein the screen has a semi-cylindrical shape.

13. An apparatus comprising:

a screen assembly including a first planar screen and a second planar screen;

an imaging system including a first camera configured to capture images of the first screen and a second camera configured to capture images of the second screen; a position indicating system including:

a first light emitter positioned and oriented to emit light in a first direction toward the first screen;

a second light emitter positioned and oriented to emit light in a second direction toward the second screen, the second direction being collinear with and opposite to the first direction; and

a third light emitter positioned and oriented to emit light in a third direction toward the first screen, the third direction being different than the first direction and the second direction.

14. The apparatus of claim 13, wherein the third light emitter is oriented so that the third direction is offset from the first direction by an offset angle of less than 45 degrees.

15. The apparatus of any of claims 13-14, further comprising a motion determining device configured to:

process the first image to determine a first intersection point, the first intersection point corresponding to an intersection of light emitted by the first light emitter with the first planar screen;

process the second image to determine a second intersection point, the second intersection point corresponding to an intersection of light emitted by the second light emitter with the second planar screen;

process the first image to determine a third intersection point, the third intersection point corresponding to an intersection of light emitted by the third light emitter with the first planar screen;

determine a position of the position indicating system relative to the screen assembly based on the first intersection point and the third intersection point; and

determine an orientation of the position indicating system relative to the screen assembly based on the first intersection point, the second intersection point, and the third intersection point.

16. The apparatus of claim 15, wherein the motion determining device being configured to determine a position of the position indicating system relative to the screen assembly based on the first intersection point and the third intersection point includes the motion determining device being configured to:

determine an identifier for the position indicating system;

retrieve an offset angle compensation factor associated with the identifier of the position indicating system;

determine a distance between the first intersection point and the third intersection point; and

determine a distance from the first planar screen to the position indicating system based on the retrieved offset angle compensation factor and the determined distance between the first intersection point and the third intersection point.

17. An apparatus configured to be worn on a dentition of a patient, the apparatus comprising: a dentition coupling device configured to couple to the dentition of the patient, the dentition coupling device including an extension member configured to protrude out from the patient s mouth; and

a position indicating system rigidly connected to the dentition coupling device, the position indicating system including:

a housing configured to rigidly connect to the extension member of the dentition coupling device;

a first light emitter disposed within the housing and oriented to emit light in a first direction;

a second light emitter disposed within the housing and oriented to emit light in a second direction, the second direction being collinear with and opposite to the first direction; and

a third light emitter disposed within the housing and oriented to emit light in a third direction, the third direction being different than the first direction and the second direction and offset from the first direction by an offset angle that is an acute angle.

18. The apparatus of claim 17, wherein the third light emitter is oriented so that the third direction is offset from the first direction by an offset angle of between 5 degrees and 15 degrees.

19. The apparatus of claim 17, wherein the third light emitter is oriented so that the third direction is offset from the first direction by an offset angle of less than 10 degrees.

20. The apparatus of any of claims 17-19, wherein:

the third light emitter is positioned so that a line corresponding to the third direction intersects with a line corresponding to the first direction;

the housing includes at least three planar surfaces that meet in a comer; and the position indicating system is associated with a compensation factor that relates the position of the comer with the position of the intersection of the line corresponding to the third direction with the line corresponding to the first direction.