Sports trainer and simulator

• US 5,984,794 A
• Filed: 10/17/1997
• Issued: 11/16/1999
• Est. Priority Date: 10/17/1997
• Status: Expired due to Fees

• Current Assignee: Global VR
• Original Assignee: Interactive Light Inc.
• Inventors: Miremadi, Reza
• Primary Examiner(s): Harrison, Jessica J.
• Assistant Examiner(s): SAGER, MARK ALAN
• Application Number:
  US08/953,196
• Time in Patent Office: 760 Days
• Field of Search: 473/131, 473/150-156, 473/180, 473/198-200, 473/219-222, 473/267, 473/353, 473/409, 473/422, 473/456, 473/470, 473/478, 434/247, 434/249, 434/252, 434/307 R, 273/358
• US Class Current: 473/199
• CPC Class Codes: A63B 2024/0034 during flight
• CPC Class Codes: A63B 24/0021 Tracking a path or terminating locations
• CPC Class Codes: A63B 69/0002 for baseball
• CPC Class Codes: A63B 69/3658 Means associated with the ball for indicating or measuring, e.g. speed, direction

Abstract

An apparatus for determining flight parameters of a ball in flight along a flight path, includes a pair of light conditioning elements on the ball, a first set of sensors having mutually orthogonal fields of view intersecting along a first plane through which the ball initially passes during flight and a second set of sensors having mutually orthogonal fields of view intersecting along a second plane through which the ball subsequently passes during flight. Each sensor includes a linear array of photodiodes for obtaining a linear image of a linear section of the ball. A controller successively pulses the sensors at microsecond intervals to obtain multiple, successive linear images of successive linear sections of the ball to obtain first and second reconstructed images of the entire ball and the locations of the elements thereon at the first and second planes, respectively, and processes changes in the locations of the elements at the first and second planes to derive the flight parameters.

Claims

1. An apparatus for determining flight parameters of a ball in flight along a flight path, comprising:

a) a pair of light conditioning elements spaced apart on an exterior surface of the ball;

b) a first set of emitter-detector pairs having fields of view intersecting along a first plane through which the ball passes during flight;

c) a second set of emitter-detector pairs having fields of view intersecting along a second plane through which the ball passes during flight, said second plane being spaced downstream of the first plane along the flight path;

d) each emitter-detector pair of the first and second sets having an emitter for emitting light in a respective one of said planes to the ball for reflection from the ball, and a detector adjacent the respective emitter for detecting light of variable intensity reflected from the ball to generate electrical signals indicative of the detected light intensity, each detector including an array of sensors for obtaining an image of a section of the ball, one of the electrical signals having a peak amplitude corresponding to a location of at least one element on the ball; and

e) a controller for controlling each set when the ball passes through the respective planes to obtain multiple, successive images of successive sections of the ball and the elements thereon, and for reconstructing the ball sections to obtain first and second reconstructed images of the entire ball including peripheral edges thereof, and for determining respective locations of the element images within the first and second reconstructed images at said first and second planes, respectively, and for processing changes in the respective locations of the element images within the first and second reconstructed images at said first and second planes to derive the flight parameters.

2. The apparatus as defined in claim 1, wherein the elements have light-reflecting properties, and wherein the peak amplitude of the electrical signal corresponds to a maximum amplitude of the electrical signal.

3. The apparatus as defined in claim 2, wherein the elements subtend an angle of 90°

.

4. The apparatus as defined in claim 1, wherein each emitter is an infra-red diode, and wherein each array is a row of charge-coupled photodiodes, and wherein each detector includes a focusing lens and a linear aperture located adjacent the photodiodes and extending lengthwise of the row.

5. The apparatus as defined in claim 1, wherein one of the emitter-detector pairs of each set extends along a vertical direction, and wherein another of the emitter-detector pairs of each set extends along a horizontal direction.

6. The apparatus as defined in claim 5, wherein the field of view of said one of the pairs faces a side elevation view of the ball, and wherein the field of view of said other of the pairs faces a bottom plan view of the ball.

7. The apparatus as defined in claim 1, wherein the fields of view of the first set of emitter-detector pairs are mutually orthogonal.

8. The apparatus as defined in claim 1, wherein the fields of view of the second set of emitter-detector pairs are mutually orthogonal.

9. The apparatus as defined in claim 1, wherein the array of sensors of each detector is arranged along a linear row for obtaining a linear image of a linear section of the ball.

10. The apparatus as defined in claim 1, wherein the controller is operative for successively pulsing the detectors of each set at microsecond intervals.

11. The apparatus as defined in claim 10, wherein the microsecond intervals are less than ten microseconds in duration.

12. The apparatus as defined in claim 10, wherein the controller is operative for reconstructing each reconstructed image only after all detectors of each set have been pulsed including, for each sensor, a sample-and-hold circuit for sampling and holding the electrical signal from a respective sensor;

a low pass filter having an output and operative for filtering the sampled and held signal;

a summing amplifier for summing the filtered signal; and

a comparator having a first input for receiving the output of each low pass filter, a second input for receiving a reference signal, and an output connected to the controller for signaling the controller to begin image reconstruction.

13. A golf simulator for determining flight parameters of a golf ball in flight along a flight path, comprising:

a) a pair of light reflecting elements spaced apart on an exterior surface of the ball;

b) a first set of emitter-detector pairs having fields of view intersecting along a first plane through which the ball passes during flight;

c) a second set of emitter-detector pairs having fields of view intersecting along a second plane through which the ball passes during flight, said second plane being spaced downstream of the first plane along the flight path;

d) each emitter-detector pair of the first and second sets having an emitter for emitting light in a respective one of said planes to the ball for reflection from the ball, and a detector adjacent the respective emitter for detecting light of variable intensity reflected from the ball to generate electrical signals indicative of the detected light intensity, each detector including an array of sensors for obtaining an image of a section of the ball, one of the electrical signals having a maximum amplitude corresponding to a location of said at least one element on the ball; and

e) a controller for successively pulsing each set when the ball passes through the respective planes at multiple intervals to obtain multiple, successive linear images of successive linear sections of the ball and the elements thereon, and for reconstructing the ball sections to obtain first and second reconstructed images of the entire ball including peripheral edges thereof, and for determining respective locations of the element images within the respective reconstructed images at said first and second planes, respectively, and for processing changes in the locations of the element images within the respective reconstructed images at said first and second planes to derive the flight parameters.

14. The simulator as defined in claim 13, wherein the light reflecting elements are adhesively secured to the ball.

15. The simulator as defined in claim 14, wherein the elements subtend an angle of 90°

.

16. The simulator as defined in claim 13, wherein each emitter is an infra-red diode, and wherein each array is a row of charge-coupled photodiodes, and wherein each detector includes a focusing lens and a linear aperture located adjacent the photodiodes and extending lengthwise of the row.

17. The simulator as defined in claim 13, wherein one of the emitter-detector pairs of each set extends along a vertical direction, and wherein another of the emitter-detector pairs of each set extends along a horizontal direction.

18. The simulator as defined in claim 17, wherein the field of view of said one of the pairs faces a side elevation view of the ball, and wherein the field of view of said other of the pairs faces a bottom plan view of the ball.

19. The simulator as defined in claim 13, wherein the fields of view of the first set of emitter-detector pairs are mutually orthogonal.

20. The simulator as defined in claim 13, wherein the fields of view of the second set of emitter-detector pairs are mutually orthogonal.

21. The simulator as defined in claim 13, wherein the array of sensors of each detector is arranged along a linear row for obtaining a linear image of a linear section of the ball.

22. The simulator as defined in claim 13, wherein the controller is operative for successively pulsing the detectors of each set at microsecond intervals.

23. The simulator as defined in claim 22, wherein the microsecond intervals are less than ten microseconds in duration.

24. The simulator as defined in claim 22, wherein the controller is operative for reconstructing each reconstructed image only after all detectors of each set have been pulsed including, for each sensor, a sample-and-hold circuit for sampling and holding the electrical signal from a respective sensor;

a low pass filter having an output and operative for filtering the sampled and held signal;

a summing amplifier for summing the filtered signal; and

a comparator having a first input for receiving the output of each low pass filter, a second input for receiving a reference signal, and an output connected to the controller for signaling the controller to begin image reconstruction.

25. An apparatus for determining flight parameters of a ball in flight along a flight path, comprising:

a) a light conditioning element on an exterior surface of the ball;

b) a first emitter-detector pair having a field of view through which the ball passes during flight;

c) a second emitter-detector pair having a field of view through which the ball passes during flight;

d) each emitter-detector pair having an emitter for emitting light to the ball and the element for reflection therefrom, and a detector adjacent the respective emitter for detecting light of variable intensity reflected from the ball and the element to generate electrical signals indicative of the detected light intensity, each detector including an array of sensors for obtaining an image of the ball, and the element; and

e) a controller for controlling each pair when the ball passes through the respective fields of view to obtain multiple, successive images of successive sections of the ball and the element thereon, and for reconstructing the ball sections to obtain a reconstructed ball image of the entire ball including peripheral edges thereof for each field of view, and for determining a location and a shape of the element image within the reconstructed ball image at each field of view, and for processing changes in the location and shape of the element image within the reconstructed ball image at each field of view to derive the flight parameters.

26. An apparatus for determining flight parameters of a ball in flight along a flight path, comprising:

a) a light conditioning element on an exterior surface of the ball;

b) an emitter-detector pair having a field of view through which the ball passes during flight;

c) said emitter-detector pair having an emitter for emitting light to the ball and the element for reflection therefrom, and a detector adjacent the emitter for detecting light of variable intensity reflected from the ball and the element to generate electrical signals indicative of the detected light intensity, said detector including an array of sensors for obtaining an image of the ball, and the element; and

d) a controller for controlling said pair when the ball passes through the field of view to obtain multiple, successive images of successive sections of the ball and the element thereon, and for reconstructing the ball sections to obtain a reconstructed ball image of the entire ball including peripheral edges thereof, and for determining a location and a shape of the element image within the reconstructed ball image, and for processing changes in the location and shape of the element image within the reconstructed ball image to derive the flight parameters.