Video speed analyzer of golf club swing or the like

• US 4,163,941 A
• Filed: 10/31/1977
• Issued: 08/07/1979
• Est. Priority Date: 10/31/1977
• Status: Expired due to Term

• Current Assignee: Roy N. Linn Jr
• Original Assignee: Roy N. Linn Jr
• Inventors: Linn, Roy N. Jr.
• Primary Examiner(s): Corcoran, Robert J.
• Assistant Examiner(s): Snow, Walter E.
• Application Number:
  US05/846,801
• Time in Patent Office: 645 Days
• Field of Search: 324/160, 324/183, 324/178, 35/29 A, 358/21, 358/903, 358/105, 358/22, 364/565, 364/410, 364/514, 364/551, 364/561, 273/186 R, 273/186 A
• US Class Current: 324/178
• CPC Class Codes: A63B 2024/0009 Computerised real time comparison with previous movements or motion sequences of the user
• CPC Class Codes: A63B 2024/0012 Comparing movements or motion sequences with a registered reference
• CPC Class Codes: A63B 2220/05 Image processing for measuring physical parameters
• CPC Class Codes: A63B 2220/30 Speed
• CPC Class Codes: A63B 2220/806 Video cameras
• 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 24/0006 Computerised comparison for qualitative assessment of motion sequences or the course of a movement
• CPC Class Codes: A63B 69/3614 using electro-magnetic, magnetic or ultrasonic radiation emitted, reflected or interrupted by the golf club
• CPC Class Codes: G01P 3/68 using optical means, i.e. using infrared, visible, or ultraviolet light G01P3/80 takes precedence ; by reflection of waves G01S17/58

Abstract

A video device and method for analyzing golf club swings or the like includes means for detecting the golf club swing and calculating the resultant velocity of the club head. The velocity is then displayed on a display device in either a digital or analog mode. The golf club swing can then be analyzed by comparing the relative velocities during different club swings.

Claims

1. A method for measuring the velocity of an object such as the head of a swinging golf club moving within a field of view which comprises:

A. coloring the object a single predetermined color;

B. providing a television camera with scanning and color responsive video circuitry responsive primarily to said predetermined color;

C. directing the camera to said field of view;

D. scanning the image of the object and converting the resulting signals of the image of said object into pulses;

E. synthesizing an array of scanned lines and transforming said pulses onto said lines in timed relation to the generation of said lines;

F. computing the pulse displacement when the pulse is displaced between repeated scanning lines on said array with due regard to the time interval between the generation of said scan lines;

G. deriving a computation of the velocity determined by the pulse displacement and;

H. providing a readout signal corresponding to said velocity.

2. A method as claimed in claim 1 wherein said array of scanned lines is a cartesian coordinate system.

3. A method as claimed in claim 1 wherein said velocity readout signal is digital.

4. A method as claimed in claim 1 wherein said velocity readout signal is analog.

5. Apparatus for measuring the velocity of an object such as a swinging golf club, the object having a particular color including:

(a) a television camera adapted to be directed at said object, said camera having scanning circuits and video circuits responsive primarily to signals of images of said particular colored object, said video circuits including means for converting said signals into pulses;

(b) means for producing synchronizing information signals connected to said camera;

(c) processing means including fixed logic means interconnected to said camera and said synchronizing signal information producing means and adapted to receive said pulses and synchronizing information signals, said fixed logic means trnsforming said pulses and synchronizing information into an array of scanned lines in timed relation to said synchronizing signals, said fixed logic means computing the displacement and velocity of said pulses on said array of scanned lines from the pulse position and scanning interval and producing a readout signal corresponding to said velocity and;

(d) a display unit interconnected to said processing means and receiving said readout velocity signal.

6. Apparatus as claimed in claim 5 wherein said television camera includes a closed circuit color television camera responsive to several colors and means provided to render such camera responsive only to said one color.

7. Apparatus as claimed in claim 5 wherein said display unit is an analog device.

8. Apparatus as claimed in claim 7 wherein said analog device is a strip chart recorder.

9. Apparatus as claimed in claim 5 wherein said display unit is a digital device.

10. Apparatus as claimed in claim 5 wherein said processing means include a microprocessor and associated peripheral hardware.

11. Apparatus as recited in claim 5 wherein said means for producing synchronizing information signals include a video synchronizing generator.

12. Apparatus for measuring the velocity of an object such as a swinging golf club in a field of view, the object having a particular color including:

(a) Two television cameras adapted to be directed at said object, said cameras being disposed at right angles to each other, each said camera having scanning circuits and video circuits responsive primarily to signals of images of said particular colored object, said video circuits including means for converting signals into pulses;

(b) means for producing synchronizing information signals connected to said first and said second camera;

(c) processing means including fixed logic means interconnected to said first and said second camera and said synchronizing information producing means and adapted to receive said pulses and synchronizing information, said fixed logic means converting said pulses received from said first and second cameras and synchronizing information into a first and second array of scanned lines, said fixed logic means computing the displacement and velocity of said pulses on said first and second array of scanned lines and producing from the pulse position and scanning interval on said first and second array readout signals corresponding to the respective velocities, and;

(d) a display unit interconnected to said processing means and adapted to receive said readout signals.

13. Apparatus as claimed in claim 12 wherein said first and second camera include closed circuit color television cameras responsive to several colors and means provided to render such camera responsive to only one said color.