Method for measuring behavior of golf club and ball

A measurement system, comprising an upper club camera, a right club camera, and a left club camera that continuously photograph behavior of a head of a golf club, and an upper ball camera and a lateral ball camera that continuously photograph behavior of a golf ball, and a computer, wherein

• at least three marks are attached to a face surface of the head, and at least one additional mark is attached to a top part of a crown portion of the head,
• the upper club camera is arranged above a ball to be hit, and the right club camera and the left club camera are spaced and arranged ahead in right and left,
• the upper ball camera is arranged above a ball to be hit, and the lateral ball camera is positioned to either right or left side of a ball to be hit,
• the club cameras are synchronized and enabled to continuously photograph,
• the ball cameras are synchronized and enabled to continuously photograph,
• the computer identifies behavior of the head from image data of the continuously photographed images of marks on the face surface of the head, identifies time of a contact of a face surface with the ball by updating in a time series a positional relationship of the face surface of the head and the ball from the behavior of the head, and measures a behavior value of the head at the time of contact and a behavior value of the hit ball, and
• the computer further determines a rotating matrix by calculating a rotation angle of the at least one additional mark on the top part of the crown portion between two points in time of the club head which is moving from each positional data of the at least one additional mark on the top part of the crown portion at the two points in time, and estimates a three-dimensional position of one mark of the three marks on the face surface at any one point in time of the two points in time by using the rotating matrix when the three-dimensional position of said one mark is not identified.

A method for measuring behavior of a club head, including steps of:

• attaching at least three marks to a face surface of the club head;
• attaching at least one additional mark to a top part of a crown portion of the club head;
• obtaining multiple pieces of two-dimensional data of the marks at at least two points in time of the club head which is moving, with multiple cameras;
• identifying positions of the marks on three-dimensional coordinates from the multiple pieces of two-dimensional data;
• identifying the face surface from positional data of three or more marks on the three-dimensional coordinates;
• identifying time of a contact of the face surface with the golf ball, by updating in a time series a positional relationship of the face surface and the golf ball;
• determining a rotating matrix by calculating a rotation angle of the at least one additional mark on the top part of the crown portion between the two points in time from each positional data of the at least one additional mark on the top part of the crown portion at the two points in time;
• and
• estimating a three-dimensional position of one mark of the three marks on the face surface at any one point in time of the two points in time by using the rotating matrix when the three-dimensional position of said one mark is not identified.

A system for measuring behavior of a club head, comprising at least three marks attached to a face surface of the head of the golf club, at least one additional mark attached to a top part of a crown portion of the head, right camera and left camera which continuously photograph behavior of the club head, and a computer, wherein

• the right camera is placed on the right side ahead of a direction of a flying ball, and the left camera is placed on the left side ahead of a direction of a flying ball;
• the cameras are synchronized and enabled to continuously photograph,
• the computer identifies positions of the marks on the face surface on three dimensional coordinates from data of the continuously photographed images of marks on the face surface, identifies the face surface from this positional data, and identifies time of a contact of the face surface with the golf ball by updating a positional relationship of the face surface and the golf ball in a time series, and
• the computer further determines a rotating matrix by calculating a rotation angle of the at least one additional mark on the top part of the crown portion between two points in time of the club head which is moving from each positional data of the at least one additional mark on the top part of the crown portion at the two points in time, and estimates a three-dimensional position of one mark of the three marks on the face surface at any one point in time of the two points in time by using the rotating matrix when the three-dimensional position of said one mark is not identified.