Monitoring systems to measure and display flight characteristics of moving sports object

• US 5,471,383 A
• Filed: 09/30/1994
• Issued: 11/28/1995
• Est. Priority Date: 01/22/1992
• Status: Expired due to Term

• Current Assignee: Acushnet Company (FILA Holdings Corp.)
• Original Assignee: Acushnet Company (FILA Holdings Corp.)
• Inventors: Days, Charles, Gobush, William, Pelletier, Diane
• Primary Examiner(s): McElheny, Jr., Donald E.
• Application Number:
  US08/316,599
• Time in Patent Office: 424 Days
• Field of Search: 364/410, 273/25, 273/26 R, 273/183.1, 273/186.2, 273/55 R, 273/85 G, 273/176 L, 273/184 R, 273/185 R, 348/47, 348/157
• US Class Current: 700/91
• CPC Class Codes: A63B 2024/0031 at the starting point
• CPC Class Codes: A63B 2024/0034 during flight
• CPC Class Codes: A63B 2102/32 Golf
• CPC Class Codes: A63B 2220/05 Image processing for measuring physical parameters
• CPC Class Codes: A63B 2220/30 Speed
• CPC Class Codes: A63B 2220/35 Spin
• CPC Class Codes: A63B 2220/806 Video cameras
• CPC Class Codes: A63B 2220/807 Photo cameras
• CPC Class Codes: A63B 2220/808 Microphones
• CPC Class Codes: A63B 2225/74 with powered illuminating means, e.g. lights
• CPC Class Codes: A63B 2243/007 American football
• CPC Class Codes: A63B 24/0003 Analysing the course of a movement or motion sequences during an exercise or trainings sequence, e.g. swing for golf or tennis
• CPC Class Codes: A63B 24/0021 Tracking a path or terminating locations
• CPC Class Codes: A63B 43/008 with means for improving visibility, e.g. special markings or colours illuminating or reflecting means A63B43/06
• CPC Class Codes: A63B 43/06 with illuminating devices ; with reflective surfaces
• CPC Class Codes: A63B 69/002 for football American-football dummies A63B69/34
• CPC Class Codes: A63B 69/0026 for ice-hockey
• CPC Class Codes: A63B 69/3658 Means associated with the ball for indicating or measuring, e.g. speed, direction
• CPC Class Codes: G01P 3/38 using photographic means
• CPC Class Codes: G01S 11/12 using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 17/50 : Systems of measurement based on relative movement of target
• CPC Class Codes: G01S 17/66 : Tracking systems using electromagnetic waves other than radio waves

Abstract

A sports object flight monitoring system including at least one shutterable camera units each of which units receive light patterns from each and every one of a plurality of contrasting areas or markers on the object in rapid successive sequence. A computer receives the signals generated by the light patterns as received by each camera unit to determine the flight characteristics of the object.

Claims

1. A system for monitoring the initial portion of the flight of an object through a field of view comprising:

(a) a support means for the object;

(b) a portable housing including at least two cameras in fixed relationship in such housing;

(c) a first camera unit in such housing having a light sensitive panel, said first camera unit being focused on the field of view through which the object passes during the initial portion of its flight;

(d) a second camera unit in such housing having a light sensitive panel focused on the field of view;

(e) means for shuttering or gating the camera units at least twice as the object passes through the field of view;

(f) three or more contrasting areas on the object positioned so that light emitting from such areas reaches such light sensitive panels to form light patterns thereon and create an analog image signal when the camera shutters are open; and

(g) computer means in or near such portable housing for receiving and processing such analog signals to determine the path of the object, its speed and spin during such initial portion of flight.

2. The system of claim 1 wherein said three or more contrasting areas includes six dots, one dot at a center location and the other five dots are at a longitude of 30°

and at latitudes of 0°

, 72°

, 144°

, 216° and

288°

, respectively.

3. The system of claim 1 further including an acoustical sensor for sensing the striking of the object, said means for admitting light responsive to said acoustical sensor.

4. The system of claim 1 wherein said shuttering means includes a flash means for emitting two flashes of light onto the object.

5. The system of claim 1 wherein said shuttering means includes means for controlling the time periods during which said light sensitive panels receive light from said object.

6. The system of claim 1 wherein said shuttering means includes a ferroelectric liquid crystal shutter.

7. The system of claim 1 further including a calibration fixture having a plurality of contrasting areas each having a precisely predetermined location thereon.

8. The system of claim 1 wherein said first and second camera units include a CCD camera having a resolution of 510×

240 pixels.

9. The system of claim 1 wherein said three or more contrasting areas are round areas of reflective materials adhered to the surface of the object.

10. The system of claim 1 wherein said three or more contrasting areas include corner-reflective retroflectors.

11. The system of claim 1 wherein said three or more contrasting areas include painted spots of reflective material.

12. An apparatus for measuring in a field the flight characteristics of a sports object passing through a field having a plurality of illuminable areas thereon comprising:

(a) first and second spaced-apart electro-video units in a portable housing, each unit having a shutter focused on the object in the field;

(b) measuring means in the electro-video units which recognize the position of calibrated illuminable areas in the field;

(c) at least three light reflecting dot means on the object;

(d) a plurality of flash lights for lighting the field;

(e) control means for opening and closing each shutter and energizing each light such that a light illuminates the object in the field when the object is at a first position and when it is at a second position;

(f) light receiving means in the electro-video unit for receiving light from the dot means when the object is at the first position and at the second position; and

(g) computer means in or near the housing for comparing the calibrated dot positions at first position with the dot positions at the second position.

13. The system of claim 12 wherein said at least three light reflecting dot means includes six dots.

14. The system of claim 13 wherein one dot is at a center location and the other five dots are at a longitude of 30°

and at latitudes of 0°

, 72°

, 144°

, 216° and

288°

, respectively.

15. The system of claim 12 further including an acoustical sensor for sensing the striking of the object, said control means for opening and closing responsive to said acoustical sensor.

16. The system of claim 12 wherein said control means for opening and closing includes means for controlling the time periods during which said light receiving means receives light from said object.

17. The system of claim 12 wherein said control means for opening and closing includes a ferroelectric liquid crystal shutter.

18. The system of claim 12 further including a calibration fixture having a plurality of contrasting areas each having a precisely predetermined location thereon.

19. The system of claim 12 wherein light receiving means includes a CCD camera having a resolution of 754×

244 pixels.

20. The system of claim 12 wherein said at least three light reflecting dots means include corner-reflective retroflectors.

21. The system of claim 12 wherein said at least three light reflecting dot means include painted spots of reflective material.

22. The system of claim 12 in which all means except the computer means and support means are located in the portable housing.

23. A system for monitoring the initial portion of the flight of an object through a field of view comprising:

(a) a support means for the object;

(b) a portable housing including a camera unit in fixed relationship in such housing;

(c) said camera unit in such housing having a light sensitive panel focused on the field of view through which the object passes during the initial portion of its flight;

(d) means for shuttering or gating said camera unit at least twice as the object passes through the field of view;

(e) three or more contrasting areas on the object positioned so that light emitting from such areas reaches each the light sensitive panel to form light patterns thereon and create an analog image signal when the camera shutter is open; and

(f) computer means in or near such portable housing for receiving and processing such analog signals to determine the path of the object, its speed and spin during such initial portion of flight.

24. The system of claim 23 wherein said three or more contrasting areas includes six dots, one dot at a center location and the other five dots are at a longitude of 37°

and at latitudes of 0°

, 72°

, 144°

, 216° and

288°

, respectively.

25. The system of claim 23 further including an acoustical sensor for sensing the striking of the object.

26. The system of claim 23 wherein said shuttering means includes a flash means for emitting two flashes of light onto the object.

27. The system of claim 23 wherein said shuttering means includes means for controlling the time periods during which said light sensitive panel receive light from said object.

28. The system of claim 23 wherein said shuttering means includes a ferroelectric liquid crystal shutter.

29. The system of claim 23 further including a calibration fixture having a plurality of contrasting areas each having a precisely predetermined location thereon.

30. The system of claim 23 wherein said camera unit include a CCD camera having a resolution of 754×

244 pixels.

31. The system of claim 23 wherein said three or more contrasting areas are round areas of reflective materials adhered to the surface of the object.

32. The system of claim 23 wherein said three or more contrasting areas include corner-reflective retroflectors.

33. The system of claim 23 wherein said three or more contrasting areas include painted spots of reflective material.

34. An apparatus for measuring in a field the flight characteristics of a sports object passing through a field having a plurality of illuminable areas thereon comprising:

(a) at least one electro-video unit in a portable housing, each unit having a shutter focused on the object in the field;

(b) calibrating means for calibrating illuminable areas on the object;

(c) measuring means in each electro-video units which recognize the position of the calibrated illuminable areas in the field;

(d) a plurality of flashing lights for lighting the field;

(e) control means for opening and closing each shutter and energizing each flash light such that light illuminates the object in the field when the object is at a first position and when it is at a second position;

(f) light receiving means in each electro-video unit for receiving light from the dot means when the object is at the first position and at the second position; and

(g) computer means in or near the housing for comparing the calibrated illuminable areas at first position with such areas at the second position.

35. The system of claim 34 wherein the illuminable areas are six dots, one dot at a center location and the other five dots are at a longitude of 37°

and at latitudes of 0°

, 72°

, 144°

, 216° and

288°

, respectively.

36. The system of claim 34 further including an acoustical sensor for sensing the striking of the object.

37. The system of claim 34 further including a calibration fixture having a plurality of contrasting areas each having a precisely predetermined location thereon.

38. The system of claim 34 wherein said light receiving means includes a CCD camera having a resolution of 754×

244 pixels.

39. The system of claim 34 wherein said illuminable areas are round areas of reflective material adhered to the surface of the object.

40. The system of claim 34 in which all means except the computer means and support means are located in the portable housing.

41. A system for monitoring the initial portion of the flight of an object through a field of view comprising:

(a) a camera having a light sensitive panel focused on the field of view through which the object passes during the initial portion of its flight;

(b) means for lighting said object at least twice as the object passes through the field of view;

(c) three or more illuminable markers on the object positioned so that light reflected from such markers reaches said light sensitive panel to form an image thereon, each of said illuminable marker having a precisely predetermined location on the object; and

(d) computer means for processing said image on said light sensitive panel to determine the launch conditions of the object during the initial portion of flight.

42. The system of claim 41 wherein said three or more illuminable markers includes six dots, one dot at a center location and the other five dots are at a longitude of 37°

and at latitudes of 0°

, 72°

, 144°

, 216° and

288°

, respectively.

43. The system of claim 41 further including an acoustical sensor for sensing the striking of the object.

44. The system of claim 41 wherein said camera is a CCD camera having a resolution of 754×

244 pixels.

45. The system of claim 41 wherein said illuminable markers are round areas of reflective material adhered to the surface of the object.

46. The system of claim 41 further including a display means for displaying the projected flight of the object.