Diagnosing method of golf swing
AssigneesDunlop Sports Co. Ltd., Sumitomo Rubber Industries, Ltd., Yoshiaki Shirai, Nobutaka Shimada
InventorsMasahiko Ueda, Yoshiaki Shirai, Nobutaka Shimada
Life of this patent
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Abstract
A camera 10 photographs a golf player swinging a golf club to hit a golf ball and the golf club. Image data is obtained by photographing. A calculating part 16 extracts a plurality of frames from the image data. The calculating part 16 determines a check frame in which the golf player is in a predetermined posture from the plurality of frames. The calculating part 16 determines a contour of the golf player from the check frame. The calculating part 16 decides a swing from the contour of the golf player. An extreme value constituting the contour is determined in deciding the swing. A feature point is determined from the extreme value. The swing is diagnosed using the feature point.
Claims16
A diagnosing method of a golf swing comprising the steps of:
- a camera photographing a golf player swinging a golf club to hit a golf ball and the golf club to obtain image data;
- determining, by a processor, a check frame in which the golf player is in a predetermined posture from a plurality of frames obtained from the image data;
- determining, by the processor, a contour of the golf player from the check frame;
- deciding, by the processor, the swing from the contour of the golf player, and determining
- extreme values constituting the contour, the extreme values being maximum values or minimum values of a predetermined function;
- determining at least one reference point from the extreme values;
- determining a plurality of feature points from the extreme values, each of said plurality of feature points being a point on the contour and expressing a region of the photographed golf player, wherein each of the plurality of feature points is determined such that a distance between the point on the contour and a straight line that passes the reference point and another point on the contour with extreme values, which is not designated as the at least one reference point, is maximized or minimized;
- calculating judging indices from a difference between coordinates of two feature points;
- and
- diagnosing the swing using position information of the plurality of feature points, wherein quality of swing is diagnosed based on whether the judging indices are in a predetermined range or not.
A diagnosing system of a golf swing comprising:
- (A) a camera photographing a golf player swinging a golf club to hit a golf ball and the golf club;
- (B) a memory storing photographed image data;
- and
- (C) a calculating part,
- wherein the calculating part comprising:
- (C1) a function for extract a plurality of frames from the image data;
- (C2) a function for determining a check frame in which the golf player is in a predetermined posture from the plurality of frames;
- (C3) a function for determining a contour of the golf player of the check frame;
- (C4) a function for determining extreme values from the contour, the extreme values being maximum values or minimum values of a predetermined function;
- (C5) a function of determining at least one reference point from the extreme values;
- (C6) a function for determining a plurality of feature points from the extreme values, each of said plurality of feature points being a point on the contour and expressing a region of the photographed golf player, wherein each of the plurality of feature points is determined such that a distance between the point on the contour and a straight line that passes the reference point and another point on the contour with extreme values, which is not designated as the at least one reference point, is maximized or minimized;
- (C7) calculating judging indices from a difference between coordinates of two feature points;
- and
- (C8) a function for diagnosing the swing using position information of the plurality of feature points, wherein quality of swing is diagnosed based on whether the judging indices are in a predetermined range or not.
Dependencies are inferred from the claim text.