JP5764044B2 - Golf swing measurement analysis system, measurement analysis device, golf club, and measurement analysis method - Google Patents

Description

  The present invention relates to a measurement analysis system, a measurement analysis apparatus, a golf club, and a measurement analysis method for the behavior of a golf club head during a golf swing.

  In general, when a golfer swings a golf club and hits (shots) a golf club with the intention of flying the ball straight, the flight direction of the golf ball is relatively straight and does not turn. (It is difficult to bend). In particular, each desired golfer can relatively easily make such a desirable shot by using an appropriate golf club. The flight direction of the golf ball by the shot is affected by various factors such as the backspin amount and launch angle in the golf swing.

  Therefore, various methods for measuring the golf swing motion of a golfer have been studied (for example, see Patent Document 1). According to Patent Document 1, a golf club having a shaft to which at least two shaft axis marks (hereinafter referred to as markers) are attached and a shaft rotation marker is attached to a jig projecting in an orthogonal direction from the shaft. Used to measure the golfer's golf swing.

  Furthermore, conventionally, an evaluation method for evaluating the dynamic behavior of a golf club shaft during a golf swing operation of a golfer has been studied (see, for example, Patent Document 2). According to Patent Document 2, a cross-correlation function is derived using time history data of strains generated at two points on a shaft during a golf swing using a strain gauge or the like, and the actual golf sink at the time of the actual golf sink. It becomes possible to evaluate the dynamic behavior of the shaft such as bending and twisting of the shaft.

Japanese Patent Laid-Open No. 2005-218783 JP 2003-102886 A

  However, the flight direction of the golf ball not only affects the bending and twisting of the shaft, but also greatly affects the behavior of the head when a golf club head (hereinafter simply referred to as the head) strikes the golf ball (impact). It is known to receive. The behavior of the head during the golf swing is influenced by various factors such as the weight of the head, the position of the center of gravity, the acceleration of the golf swing, and the bending and twisting of the shaft. Further, due to the behavior of the head such as the rotation of the head, the shaft may be bent or twisted. The relative relationship between the behavior of the head, such as the rotation of the head, and the behavior of the shaft, such as the bending or torsion of the shaft, has not been considered so far.

  That is, even if a golf club having a marker on the shaft axis and a jig protruding from the shaft as shown in Patent Document 1 is used, the bending and twisting of the shaft itself can be measured. The relative relationship between the behavior and the behavior of the head could not be analyzed and evaluated. Furthermore, the evaluation method for evaluating the dynamic behavior of the shaft of the golf club as shown in Patent Document 2 only realizes measurement and analysis of the dynamic behavior of the shaft itself during golf swing, The relative relationship between the behavior of the shaft and the behavior of the head could not be analyzed and evaluated. Further, the evaluation method according to Patent Document 2 requires a measurement cable or the like connected to the golf club, and the subject's original golf swing cannot be performed.

  Therefore, an object of the present invention made in view of such points is to measure and analyze a golf swing, and measure and analyze the relative relationship between the behavior of the shaft and the behavior of the head. An apparatus, a golf club, and a measurement analysis method are provided.

  In order to achieve the above object, a measurement and analysis system according to the present invention is a golf swing measurement and analysis system for measuring and analyzing the behavior of a golf club when a golfer hits a golf ball with a golf club. A golf club having at least two shaft markers, at least one head marker on the head of the golf club, and at least one shaft rotating marker on a jig projecting from the shaft And at least two cameras that image a golf swing using the golf club, a marker recognition position information acquisition unit that recognizes each marker and acquires position information of each recognized marker, A first vector representing rotation of the shaft from position information; and A measurement / analysis device having a vector calculation unit for calculating a second vector representing rotation of the door, and a head behavior acquisition unit for calculating a vector angle formed by the first vector and the second vector. To do.

  In the golf swing measurement and analysis system according to the present invention, it is preferable that the head behavior acquisition unit acquires a temporal change in a vector angle formed by the first vector and the second vector.

  In the golf swing measurement and analysis system according to the present invention, the vector calculation unit calculates the first vector from position information of the shaft marker and the shaft rotation marker, and the shaft marker and the head marker. It is preferable to calculate the second vector from the position information.

  In the golf swing measurement and analysis system according to the present invention, the golf club includes at least three shaft markers on the shaft or the grip, and the vector calculation unit includes at least three shaft markers. The first vector is calculated using position information of two shaft markers in the order of distance from the head and position information of the shaft rotation marker, and the two shafts in the order of the shaft markers closer to the head. Preferably, the second vector is calculated using position information of the marker for the head and position information of the marker for the head.

  In the golf swing measurement and analysis system according to the present invention, the distance between the shaft marker closest to the head and the shaft marker closest to the shaft marker among the at least three shaft markers is 1200 mm. Is preferably within.

In order to achieve the above object, a measurement and analysis apparatus according to the present invention is a golf swing measurement and analysis apparatus that measures and analyzes the behavior of a golf club when a golfer hits a golf ball with a golf club. A golf club having at least two shaft markers, at least one head marker on the head of the golf club, and at least one shaft rotating marker on a jig projecting from the shaft An image acquisition unit that acquires an image of the golf swing from at least two cameras, a marker recognition position information acquisition unit that recognizes each marker and acquires position information of each recognized marker, and A first vector representing rotation of the shaft from the position information, and the head A vector calculating unit for calculating a second vector representing the rotation,
And a head behavior acquisition unit that calculates a vector angle formed by the first vector and the second vector.

  In order to achieve the above object, a golf club according to the present invention is a golf club used for measurement analysis of a golf swing for measuring and analyzing the behavior of a golf club when a golfer hits a golf ball with a golf club. At least two shaft markers on the shaft axis of the club, at least one head marker on the head of the golf club, and at least one shaft rotation marker on a jig provided protruding from the shaft; It is characterized by having.

  In order to achieve the above object, a golf swing measurement and analysis method for measuring and analyzing the behavior of a golf club when a golfer hits a golf ball with a golf club, comprising at least two shaft markers on the shaft axis of the golf club And an image obtained by imaging a golf swing of a golf club having at least one head marker on the head of the golf club and at least one shaft rotation marker on a jig provided protruding from the shaft. Obtaining from at least two cameras, recognizing each marker, obtaining position information of each recognized marker, and a first vector representing rotation of the shaft from the obtained position information, And calculating a second vector representing the rotation of the head; It is characterized in that comprising the step of calculating a vector angle formed between the second vector and the first vector.

  ADVANTAGE OF THE INVENTION According to this invention, a golfer's original golf swing can be measured and the relative relationship of the behavior of the shaft of a golf club and the behavior of a head can be measured and analyzed.

It is the schematic of the measurement analysis system of the behavior of the golf club at the time of the golf swing which concerns on one embodiment of this invention. It is a functional block diagram which shows schematic structure of the measurement analysis apparatus of the behavior of the golf club in the system shown in FIG. It is a flowchart for demonstrating the measurement analysis method of the behavior of the golf club at the time of the golf swing by this embodiment. It is a figure which shows an example of the golf club which has a marker used with the measurement analysis system of the golf swing which concerns on this embodiment. It is a figure for demonstrating the function of the vector calculation part shown in FIG. It is a figure for demonstrating the function of the head behavior acquisition part shown in FIG. It is a figure which shows another example of the golf club used with the measurement analysis system of the golf swing by this embodiment. It is a figure for demonstrating the function of the vector calculation part shown in FIG. It is a figure explaining the time-dependent change of the relative relationship of rotation of a head and a shaft.

  Hereinafter, a measurement analysis system and a measurement analysis method for the behavior of a golf club during a golf swing according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a measurement / analysis system for the behavior of a golf club during a golf swing according to an embodiment of the present invention. A measurement analysis system 1 shown in FIG. 1 includes a first camera 2A and a second camera which are imaging devices for acquiring an image (video) of a golf swing when a subject (golfer) 4 hits a golf ball with a golf club 5. A camera 2B, a measurement analysis device 3 for measuring and analyzing the behavior of the golf club during a golf swing from the acquired image, and a golf club 5 used by the subject 4 are provided.

  The measurement analysis system 1 includes a first camera 2A and a second camera which are at least two cameras in order to acquire three-dimensional coordinates of markers M1 to M4 attached to a golf club 5 which will be described later with reference to FIG. 2B. The first camera 2A and the second camera 2B are, for example, a motion capture camera or a high speed camera. The number of cameras included in the measurement analysis system 1 is not limited to two, and it is of course possible to use three or more cameras. The first camera 2 </ b> A and the second camera 2 </ b> B are arranged apart from each other by a predetermined interval so that an image for three-dimensional measurement of the golf swing trajectory can be acquired. The first camera 2 </ b> A and the second camera 2 </ b> B are appropriately spaced from the subject 4 so that the head of the golf club 5 during the golf swing by the subject 4 can be imaged.

  FIG. 2 is a functional block diagram illustrating a schematic configuration of the measurement analysis apparatus 3. The measurement analysis device 3 acquires a golf swing video from the first camera 2A and the second camera 2B via the interfaces (I / F) 6A and 6B and performs a calculation, and the measurement analysis device 3 as a whole. The control part 8 which controls this is provided. The measurement analysis device 3 is connected to a display unit 9 that displays a calculation result by the calculation unit 7 and a database 10 that stores a calculation result by the calculation unit 7. The calculation unit 7 of the measurement analysis apparatus 3 includes a marker recognition position information acquisition unit 11, a vector calculation unit 12, and a head behavior acquisition unit 13. The measurement analysis device 3 is configured by, for example, a personal computer having a CPU (Central Processing Unit).

  The marker recognition position information acquisition unit 11 recognizes the markers M1 to M4 and acquires the position information of the recognized markers M1 to M4. Specifically, the marker recognition position information acquisition unit 11 uses markers M1 to M4 attached to the golf club 5 for an arbitrary number of frames extracted from video data acquired from the first camera 2A and the second camera 2B. Are recognized by, for example, a circle fitting method, and three-dimensional coordinates are acquired by, for example, a triangulation method, for each center position of the markers M1 to M4. Hereinafter, the three-dimensional coordinates of the center positions of the markers M1 to M4 are referred to as position information.

  The vector calculation unit 12 calculates a first vector indicating the rotation of the shaft axis and a second vector indicating the rotation of the head based on the position information of the markers M1 to M4 acquired by the marker recognition position information acquisition unit 11. To do. The calculation method of the first vector and the second vector will be described later with reference to FIG.

  The head behavior acquisition unit 13 calculates a vector angle formed by the first vector and the second vector. This vector angle is a value indicating the relative relationship between the rotation of the shaft and the rotation of the head. Furthermore, the head behavior acquisition unit 13 can acquire a change amount from a predetermined angle value. Here, the predetermined angle value is, for example, a value of a vector angle formed by the first vector and the second vector in a state where a golf swing is not performed, that is, in an initial state. Further, the head behavior acquisition unit 13 calculates the vector angle formed by the first vector and the second vector during the golf swing with time, and considers the correlation between the rotation of the shaft and the rotation of the head over time. You can also get the behavior. The relationship between the first vector and the second vector will be described later with reference to FIG.

  FIG. 3 is a flowchart for explaining a method for measuring and analyzing the behavior of a golf club during a golf swing according to the present embodiment. The control unit 8 illustrated in FIG. 2 stores the video acquired from the first camera 2A and the second camera 2B via the interfaces (I / F) 6A and 6B in a storage unit (not shown) or the like. Control (step S01).

  Next, the control unit 8 controls the marker recognition position information acquisition unit 11 of the calculation unit 7, recognizes the markers M1 to M4, and calculates the position information of the recognized markers M1 to M4 (step S02). The control unit 8 arbitrarily extracts each image (frame) included in the video (moving image) stored in the storage unit (not shown) in step S01, and recognizes the markers M1 to M4 for each extracted image. And the marker recognition position information acquisition part 11 of the calculating part 7 is controlled so that calculation of position information may be repeated.

  And the control part 8 controls the vector calculation part 12 of the calculating part 7, and is based on each position information of the markers M1-M4 acquired by the marker recognition position information acquisition part 12 in step S02. A vector and a second vector are calculated (step S03). Further, the control unit 8 controls the head behavior acquisition unit 13 of the calculation unit 7 to calculate a vector angle formed by the first vector and the second vector, and calculates the value relative to the rotation of the shaft and the rotation of the head. Acquired as head behavior data considering the relationship (step S04). Here, the head behavior acquisition unit 13 may acquire the temporal change of the vector angle formed by the first vector and the second vector as head behavior data in consideration of the relative relationship between the rotation of the shaft and the rotation of the head. it can. Then, the control unit 8 stores the head behavior data acquired by the head behavior acquisition unit 13 in the database 10.

  FIG. 4 is a view showing an example of a golf club having a marker used by a golfer in the measurement analysis system shown in FIG. The golf club 5 has at least two shaft markers M1 and M3 and at least one head marker on the head 16 on the shaft axis, that is, on the central axis of the shaft 15 and the grip 14. It has a head marker M4 and a shaft rotation marker M2 which is at least one shaft rotation marker on a jig 17 provided protruding from the shaft 15. The markers M1 to M4 are spheroids, preferably spherical. The surfaces of the markers M1 to M4 are covered with a reflective tape, for example. Even if it is other than the reflective tape, the markers M1 to M4 may be covered with a material whose contrast with surrounding pixels is equal to or higher than a predetermined value on the images taken by the first camera 2A and the second camera 2B. it can.

  As shown in FIG. 4, the shaft marker M <b> 1 is attached to the tip of the grip 14 of the golf club 5. The position of the shaft marker M <b> 1 is a position that does not hinder the golf swing by the subject and may be disposed at the upper part as viewed from the entire golf club 5, and is not necessarily limited to the grip end. The shaft rotation marker M2 is attached to the tip of a jig 17 protruding from the shaft 15. The shaft marker M3 is attached to the head side of the shaft 15, that is, the lower portion of the shaft 15, and the head marker M4 is attached to the upper surface of the head 16. The length from the center of the shaft rotation marker M2 attached to the tip of the jig to the shaft axis is, for example, less than 50 mm, but is not limited thereto. However, if the length of the jig is too long, the jig itself may be distorted during the golf swing, which may adversely affect the measurement accuracy. The jig is made of a material having sufficiently high rigidity such as steel.

  Further, the position of the shaft marker M3 can be variously changed according to the rigidity, length, torque value, etc. of the shaft 15, for example, at a position 20 mm from the lower portion of the shaft 15 (the base of the head 16). is there. The shaft rotation marker M2 may be provided so as to be at an angle of a predetermined value or more with respect to the shaft axis with respect to the head marker M4, for example, 90 °. Further, the head marker M4 is attached to the upper surface of the head 16 and in the vicinity of the end far from the shaft 15, but this is not restrictive. Next, the calculation method of the first vector and the second vector by the vector calculation unit 12 will be described in detail with reference to FIG.

  FIG. 5 is a diagram for explaining the function of the vector calculation unit 12 shown in FIG. The vector calculation unit 12 is perpendicular to a vector passing through the three-dimensional coordinates of the center of the shaft marker M1 and the shaft marker M3 (hereinafter referred to as “shaft axis vector”), and the shaft rotation marker M2 A vector passing through the central three-dimensional coordinate is calculated as a first vector V1 representing the rotation of the shaft (that is, the twist of the shaft). Further, the vector calculation unit 12 calculates a vector that is perpendicular to the above-described shaft axis vector and passes through the central three-dimensional coordinates of the head marker M4 as the second vector V2 indicating the rotation of the head. Next, a head behavior acquisition method by the head behavior acquisition unit 13 will be described with reference to FIG.

  FIG. 6 is a diagram for explaining the function of the head behavior acquisition unit 13 shown in FIG. FIG. 6 is a view of the golf club 5 as viewed from above, and in the drawing, the right side is the face surface of the head 16. For clarity, the grip 14, the first shaft marker M1, and the second shaft marker M3 are not shown. FIG. 6A is a diagram corresponding to the golf club 5 in a state where a golf swing is not performed (that is, a state where no force is applied).

  At this time, the head marker M4 and the shaft rotation marker M2 attached to the head 16 are in a positional relationship of, for example, 90 degrees with respect to the shaft axis of the shaft 15. That is, the vector angle between the first vector V1 and the second vector V2 in a state where no force is applied (initial state) is 90 degrees. Note that the vector angle in the initial state is not limited to 90 degrees and can be set to any arbitrary angle. The head behavior acquisition unit 13 acquires a vector angle between the first vector V1 and the second vector V2 during the golf swing.

  During a golf swing, the head is subjected to an inertial force opposite to the swing direction due to a force generated by a downswing. As a result, the head 16 rotates in the direction opposite to the swing direction as shown in FIG. Due to this rotation, the shaft 15 is twisted in the clockwise direction in the drawing (that is, the direction opposite to the swing direction), and the vector angle between the first vector V1 and the second vector V2 is narrowed. The head behavior acquisition unit 13 calculates a vector angle between the first vector V1 and the second vector V2, and acquires the vector angle as data on the head behavior in consideration of the relative relationship between the rotation of the shaft and the rotation of the head. Furthermore, the head behavior acquisition unit 13 can calculate the difference between the narrowed vector angles with respect to the vector angles of the first vector V1 and the second vector V2 in the initial state as the head change amount with respect to the initial state. Specifically, when the vector angle in the initial state is 90 degrees, the head behavior acquisition unit 13 calculates the difference between the vector angle between the first vector V1 and the second vector V2 during the golf swing and 90 degrees. Can be calculated as the amount of change of the head with respect to the initial state.

  On the other hand, the centrifugal force generated by the golf swing also acts on the head 16, and the force acts so that the position of the center of gravity of the head 16 moves to the position where the swing radius of the golf swing intersects the swing path. As shown in (C), the head 16 rotates in the swing direction. Due to this rotation, the shaft 15 is twisted in the counterclockwise direction (namely, the swing direction) in the figure, and the vector angle between the first vector V1 and the second vector V2 is widened. In this case, the head behavior acquisition unit 13 can calculate the difference between the spread vector angle and the vector angle in the initial state as the amount of change in the head with respect to the initial state.

  Thus, in addition to the inertial force and centrifugal force due to the golf swing, the force in the rotational direction caused by these and the force in the rotational direction input from the wrist of the subject 4 act on the golf club 5. Such force in the rotational direction (that is, twist direction) is called torque. The magnitude of the torque and the time of occurrence vary depending on the subject's 4 golf swing type. For this reason, in order to grasp the tendency and type of golf swings of a plurality of subjects, it is important to measure and analyze these force patterns.

  According to the golf swing measurement analysis system and the measurement analysis method according to the embodiment of the present invention, as described above, the golf club 5 has at least two shaft markers M1 and M3, a head marker M4, and a shaft rotation. The golf swing is measured and analyzed with the marker M2. Thereby, in the actual golf swing by the golfer, the relative relationship between the behavior of the shaft such as the twist of the shaft and the rotational behavior of the head can be measured and analyzed.

  FIG. 7 is a view showing another example of the golf club 5 used in the golf swing measurement and analysis system according to this embodiment. In addition to the same markers M1 to M4 as the golf club 5 described with reference to FIG. 4, the golf club 5 further includes two shaft markers, a shaft marker M5 and a shaft marker M6. The arrangement of the shaft markers is, for example, as follows. A shaft marker M1 is disposed at the grip end, a shaft marker M5 is disposed at the upper portion of the shaft at a predetermined interval (for example, about 10 to 100 mm) from the jig 17 with the shaft rotation marker, and the shaft marker is disposed at the lower portion of the shaft. The marker M3 is disposed, and the shaft marker M6 is disposed at a predetermined interval (for example, about 1 to 550 mm) away from the shaft marker M3. If the distance between the shaft markers M6 and M3 is greater than 550 mm, the position of the kick point (the point where the shaft bends greatly) will be included, and the shaft axis vector near the head marker M4 cannot be measured. Measurement accuracy will drop. If the distance between the shaft markers M6 and M3 is smaller than 1 mm, the marker is difficult to identify due to insufficient accuracy of optical measurement, and the measurement accuracy is lowered. The interval (distance) referred to here is not a distance between the center line of the jig 17 or the centers of the markers M1 to M6 but a distance based on the surface of the jig 17 or the markers M1 to M6.

  It should be noted that the position of the shaft marker M1 is a position that does not hinder the golf swing by the subject and may be disposed at the upper part as viewed from the entire golf club 5, and is not necessarily limited to the grip end. Further, the position of the shaft markers M5 and M6 can be calculated as an optimum value based on, for example, a force applied by a golf swing and a cantilever model based on the length and rigidity of the shaft 15. Next, with reference to FIG. 8, the calculation method of the 1st vector and the 2nd vector by the vector calculation part 12 in the case of using the golf club 5 is explained in full detail.

  FIG. 8 is a diagram for explaining the function of the vector calculation unit 12 shown in FIG. The vector calculation unit 12 selects two shaft markers in order of increasing distance from the head 16 among all the shaft markers, and calculates the first shaft axis vector VS1. Here, the vector calculation unit 12 calculates the first shaft axis vector VS1 using the position information of the shaft marker M1 farthest from the head 16 and the position information of the shaft marker M5 farthest from the head 16. Then, the vector calculation unit 12 uses a vector that is perpendicular to the first shaft axis vector VS1 and passes through the central three-dimensional coordinates of the shaft rotation marker M2 as a first representing the rotation of the shaft (that is, the twist of the shaft). Calculated as vector V1.

  Further, the vector calculation unit 12 selects two shaft markers in the order closer to the head 16 among all the shaft markers, and calculates the second shaft axis vector VS2. Here, the vector calculation unit 12 calculates the second shaft axis vector VS2 using the position information of the shaft marker M6 and the position information of the shaft marker M3, and is perpendicular to the second shaft axis vector VS2. A vector passing through the center three-dimensional coordinates of the head marker M4 is calculated as a second vector V2 indicating the rotation of the head. Then, the head behavior acquisition unit 13 acquires the head behavior by the method described with reference to FIG.

  As shown in FIG. 8, the golf club 5 takes different directions during the golf swing in the process of going through the impact from the downswing to the follow-through. Using the golf club 5, the first shaft axis vector VS1 and the second shaft axis vector VS2 are obtained, and the first and second vectors V1 and V2 are calculated using these to obtain the shaft 15 during the golf swing. Measurement errors due to bending can be removed. That is, the positional relationship between the shaft rotation marker M2 and the shaft axis in the vicinity thereof, and the positional relationship between the head marker M4 and the shaft axis in the vicinity thereof are calculated, and the results are compared with each other. The influence of bending can be removed.

  Here, in order to remove the influence of the bending of the shaft 15, at least two shaft axis vectors corresponding to the upper and lower portions of the shaft 15 having at least three shaft markers on the shaft axis are calculated. It only needs to be possible. By measuring with such a golf club having at least three shaft markers, the relative relationship between the head behavior and the shaft behavior is measured and analyzed even for a golf club having a relatively low rigidity, that is, a flexible golf club. It becomes possible to do.

  FIG. 9 is a diagram for explaining the change with time of the relative relationship between the rotation of the head and the shaft. Here, in using the measurement analysis apparatus and measurement analysis method according to an embodiment of the present invention described with reference to FIGS. 1 to 3, four shafts on the shaft axis as described with reference to FIG. Measurement analysis was performed using a golf club having markers M1, M3, M5, and M6. FIG. 9 shows the result of measuring and analyzing the golf swings of the subject 1 and the subject 2 by the measurement analysis system 1. In the figure, the time of 0 hour is the time when the golf club hits the golf ball, that is, the impact time. The angle is plotted with the case of rotating toward the swing direction of the golf swing as plus and the rotation opposite to the swing direction as minus. Subject 1 and subject 2 both performed a swing using the same golf club with a head of 385 cc. As shown in the figure, despite using the same golf club, Subject 1 and Subject 2 showed head behaviors with considerably different tendencies.

  Therefore, in relation to the classification of golf swing types by golfers, data relating to the relative relationship between the head behavior and the shaft behavior during golf swing, which can be measured and analyzed using the measurement analysis device and measurement analysis method according to one embodiment of the present invention. Has been shown to be a useful indicator. Furthermore, such data can be used not only as a golf swing type by a golfer as an index for classification, but also as an index for quantitatively evaluating the performance of a head during a golf swing in developing a golf club. As described above, the data acquired by using the measurement analysis device and the measurement analysis method according to the embodiment of the present invention selects the golf club suitable for the golfer by increasing the accuracy of the golf swing type classification of the golfer. Can help. At the same time, such data can facilitate the development of golf clubs according to the golfer's golf swing type.

  Although one embodiment of the present invention has been described, various modifications can be made within the scope of the claims. For example, here, the measurement analysis apparatus 3 is shown as including the display unit 9 and the database 10, but these function units can of course be configured as external units with respect to the measurement analysis apparatus 3.

DESCRIPTION OF SYMBOLS 1 Measurement analysis system 2A, 2B Camera 3 Measurement analysis apparatus 4 Test subject 5 Golf club M1, M3, M5, M6 Shaft marker M2 Shaft rotation marker M4 Head marker 6A, 6B Interface (I / F)
DESCRIPTION OF SYMBOLS 7 Calculation part 8 Control part 9 Display part 10 Database 11 Marker recognition position information acquisition part 12 Vector calculation part 13 Head behavior acquisition part 15 Shaft 16 Head 17 Jig

Claims (10)

A golf swing measurement and analysis system for measuring and analyzing the behavior of a golf club when a golfer hits a golf ball with a golf club,
At least two shaft markers on the shaft axis of the golf club, at least one head marker on the head of the golf club, and at least one shaft rotation marker on a jig provided protruding from the shaft; A golf club having
At least two cameras for imaging a golf swing using the golf club;
A marker recognition position information acquisition unit that recognizes each marker and acquires position information of each recognized marker, a first vector that indicates rotation of the shaft from the acquired position information, and a first that indicates rotation of the head. A measurement analysis apparatus having a vector calculation unit for calculating two vectors, and a head behavior acquisition unit for calculating a vector angle formed by the first vector and the second vector;
A golf swing measurement and analysis system comprising:   2. The golf swing measurement and analysis system according to claim 1, wherein the head behavior acquisition unit acquires a temporal change in a vector angle formed by the first vector and the second vector. The vector calculation unit
Calculating the first vector from position information of the shaft marker and the shaft rotation marker;
The second vector is calculated from position information of the shaft marker and the head marker,
The golf swing measurement analysis system according to claim 1. The golf club has at least three shaft markers on the shaft or the grip,
The vector calculation unit
Calculating the first vector using position information of two shaft markers and position information of the shaft rotation marker in order of increasing distance from the head among the at least three shaft markers;
Calculating the second vector using position information of two shaft markers and position information of the head markers in the order closer to the head among the shaft markers;
The golf swing measurement and analysis system according to any one of claims 1 to 3, wherein the golf swing is measured and analyzed.   The distance between the shaft marker closest to the head and the shaft marker closest to the shaft marker among the at least three shaft markers is 1200 mm or less. The described golf swing measurement and analysis system. A golf swing measurement and analysis device for measuring and analyzing the behavior of a golf club when a golfer hits a golf ball with a golf club,
At least two shaft markers on the shaft axis of the golf club, at least one head marker on the head of the golf club, and at least one shaft rotation marker on a jig provided protruding from the shaft; , An image acquisition unit that acquires an image of a golf swing of a golf club having at least two cameras;
A marker recognition position information acquisition unit that recognizes each marker and acquires position information of each recognized marker;
A vector calculation unit for calculating a first vector representing the rotation of the shaft and a second vector representing the rotation of the head from the acquired position information;
A head behavior acquisition unit that calculates a vector angle formed by the first vector and the second vector;
A golf swing measurement and analysis device, comprising: A golf club used for measurement analysis of a golf swing for measuring and analyzing the behavior of a golf club when a golfer hits a golf ball with a golf club,
At least two shaft markers on the shaft axis of the golf club, at least one head marker on the head of the golf club, and at least one shaft rotation marker on a jig protruding from the shaft And a golf club.   The golf club according to claim 7, comprising at least three shaft markers on the shaft axis.   9. The distance between the shaft marker closest to the head and the shaft marker closest to the shaft marker among at least three of the shaft markers is 1200 mm or less. The listed golf club. A golf swing measurement and analysis method for measuring and analyzing the behavior of a golf club when a golfer hits a golf ball with a golf club,
At least two shaft markers on the shaft axis of the golf club, at least one head marker on the head of the golf club, and at least one shaft rotation marker on a jig provided protruding from the shaft; Obtaining an image obtained by imaging a golf swing of a golf club having, from at least two cameras;
Recognizing each marker and obtaining position information of each recognized marker;
Calculating a first vector representing rotation of the shaft and a second vector representing rotation of the head from the acquired position information;
Calculating a vector angle formed by the first vector and the second vector;
A method for measuring and analyzing a golf swing, comprising:

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