Patent Document ID: 8708833
Application ID: 13399634
Patent Status: 1

Claim One:
1. A method for measuring behavior of a golf club head and a ball, including steps of: attaching at least three marks to a face surface of a head of a golf club; attaching at least one additional mark to a top part of a crown portion of the head; at least three club cameras simultaneously photographing the marks at two points in time before impact; obtaining multiple pieces of two-dimensional data of the marks from signals of images simultaneously photographed at the two points in time before the impact; identifying three-dimensional positions of the marks at the two points in time, from the two-dimensional data of the marks at the two points in time; identifying behavior of the face surface from the three-dimensional position of each mark at the two points in time; identifying time of a contact of the face surface with the ball by updating in a time series the behavior of the face surface and a positional relationship with the ball; estimating behavior of the head at the time of contact of the face surface with the ball; at least two ball cameras simultaneously photographing a hit ball at two points in time; obtaining multiple pieces of two-dimensional data on the ball from signals of images of the hit ball simultaneously photographed at the two points in time; identifying a three-dimensional position and posture of the ball at the two points in time from the two-dimensional data of the ball at the two points in time; estimating a behavior value of the ball from the three-dimensional position and posture of the ball at the two points in time; 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.