WO2013051277A1

WO2013051277A1 - Golf club deformation measurement system, measurement method, and measurement device

Info

Publication number: WO2013051277A1
Application number: PCT/JP2012/006399
Authority: WO
Inventors: 高尾　浩二; 松永　英夫; 浩正岩出
Original assignee: 株式会社ブリヂストン; ブリヂストンスポーツ株式会社
Priority date: 2011-10-04
Filing date: 2012-10-04
Publication date: 2013-04-11
Also published as: JPWO2013051277A1; CN103857445B; CN103857445A; US20150038249A1; JP6078470B2

Abstract

Provided is a golf club deformation measurement system with which it is possible to easily measure golf club deformation for a golfer's normal golf swing. A measurement system (1) according to the present invention comprises: an image capture device (4) which is attached to a golf club (3) toward a direction which includes at least one identification feature which is attached to the golf club (3), the location whereof on the golf club (3) can be identified; and a measurement device (2) which measures the deformation of the golf club on the basis of the location information of at least one of the identification features which are acquired from an image of the golf club swing which is captured with the image capture device (4).

Description

MEASUREMENT SYSTEM, MEASUREMENT METHOD, AND MEASUREMENT DEVICE OF GOLF CLUB DEFORMATION

The present invention relates to a measurement system, a measurement method, and a measurement apparatus of deformation of a golf club at the time of golf swing.

Generally, when a golfer swings a golf club and strikes (shots) a golf ball with the intention of causing a golfer to fly the ball straight, the flight direction of the golf ball is relatively straight and does not bend. (It is hard to bend) is desirable. In particular, each golfer may make such a desirable shot relatively easy by using an appropriate golf club. However, it is not easy for a golfer to actually go to the store and select a golf club that suits them.

By the way, the flight direction of the ball is influenced by factors such as the amount of backspin and the launch angle in the golf swing. These factors are known to be greatly affected by, for example, the movement of a golf club head (hereinafter simply referred to as a head) when the head strikes a golf ball (impact). In addition, during the golf swing by the golfer, the shaft of the golf club is deformed according to the weight of the head of the golf club and the force applied from the golfer to the golf club. The deformation of the golf club shaft is generally referred to as bending. This tendency is believed to have a very significant effect on the golfer in achieving the desired golf swing.

Therefore, conventionally, a method has been proposed in which a strain gauge is attached to a golf club and a strain generated on a shaft in a golf swing is measured (see, for example, Patent Document 1). In the method described in Patent Document 1, a strain gauge can be attached on the surface of the shaft of a golf club to measure an incursion on the shaft during a golf swing.

Furthermore, conventionally, in order to measure the shape of a shaft deformed at the time of golf swing by a golfer, a golf swing using a golf club provided with a large number of markers is photographed by a plurality of imaging devices, and three-dimensional markers are obtained by motion capture. A method of measuring coordinates has been proposed (see, for example, Patent Document 2). In the system described in Patent Document 2, the shape of the shaft at the time of golf swing can be approximated by curve approximation from the measured three-dimensional coordinates.

Takeshi Naruo et al., "Studies on Flex in Golf Shaft", Joint Symposium Sports Engineering Symposium / Symposium: Proceedings of Human Dynamics Conference, The Japan Society of Mechanical Engineers, 1995, No. 95-45 JP, 2011-183090, A

However, in order to obtain information on the overall tendency of a golf club in a manner as described in Patent Document 1, it is necessary to attach a large number of strain gauges to a shaft. Wiring increases, making it difficult for the golfer to perform the usual golf swing.

On the other hand, in the method described in Patent Document 2, it is necessary to correct the relative positional relationship between imaging devices in order to obtain three-dimensional position coordinates of a marker. As the number of imaging devices increases, the correction naturally takes time, and it is impossible to easily measure the deformation of the golf club.

As described above, in the conventional method and system, the deformation of the golf club at the time of the golf swing can not be easily measured for the golf swing by the golfer as usual.

Therefore, an object of the present invention made in view of such a point is a measurement system, a measurement method and a measurement apparatus for measuring the deformation of a golf club, which can easily measure the deformation of a golf club for a golf swing by a golfer as usual. To provide.

In order to achieve the above object, a measurement system of deformation of a golf club according to the present invention is:
A measuring system for measuring the deformation of a golf club when the golfer swings the golf club,
An imaging device attached to the golf club in a direction including at least one identification feature attached to the golf club capable of identifying a position on the golf club;
A measuring device that measures deformation of the golf club based on position information of the at least one identification feature acquired from an image of the golf club at the time of a swing captured by the imaging device;
And the like.

According to the measurement system of the deformation of the golf club according to the present invention, the deformation of the golf club at the time of the usual golf swing by the golfer can be easily measured.

Further, in the golf club deformation measurement system according to the present invention,
The measuring device is
An image acquisition unit for acquiring an image of the golf club at the time of swing from an imaging device;
A position information acquisition unit that recognizes the at least one identification feature from the acquired image and acquires position information of the recognized at least one identification feature;
It is preferable to have the measurement part which measures the deformation | transformation of the said golf club based on the acquired said positional information.

According to this configuration, it is possible to easily measure the deformation of the golf club at the time of golf swing by the respective functional units included in the measuring device.

Further, in the golf club deformation measurement system according to the present invention,
Preferably, the at least one identification feature is provided on the head of the golf club.

According to this configuration, it is possible to measure the movement of the head of the golf club and / or the bending of the shaft that is reflected in the movement of the head.

Further, in the golf club deformation measurement system according to the present invention,
Measuring the behavior of the head of the golf club and / or the bending of the shaft as the deformation of the golf club is the movement of the head and / or the bending of the shaft of the golf club be able to.

In the golf club deformation measuring system according to the present invention, preferably, the imaging device is less than 90 g.

According to this configuration, it is possible to measure the deformation of the golf club on which the influence of the usual head speed is reflected, since the head speed at the time of swing is not significantly reduced.

In order to achieve the above object, a method of measuring deformation of a golf club according to the present invention is:
A measuring method for measuring the deformation of a golf club when the golfer swings the golf club,
During a golf swing using a golf club having at least one identification feature that can specify a position on the golf club and an imaging device attached to a direction including the identification feature, the imaging device Obtaining an image,
Acquiring an image of the golf club at the time of swing from the imaging device;
Recognizing the at least one identification feature from an image captured by the imaging device, and acquiring position information of the recognized at least one identification feature;
Measuring the deformation of the golf club based on the acquired position information;
It is characterized by including.

According to the method of measuring the deformation of a golf club according to the present invention, it is possible to easily measure the deformation of a golf club during a golf swing as usual by a golfer.

In order to achieve the above object, a measuring device of a golf club deformation according to the present invention is:
A measuring device for measuring the deformation of a golf club when the golfer swings the golf club,
The golf club at the time of a swing imaged by an imaging device attached to the golf club in a direction including at least one identification feature attached to the golf club that can locate the position on the golf club The deformation of the golf club is measured based on position information of the at least one identification feature acquired from an image.

According to the measuring apparatus of the deformation of the golf club according to the present invention, it is possible to easily measure the deformation of the golf club during the usual golf swing by the golfer.

According to the present invention, the predetermined measurement is made based on the image of the golf swing acquired by the imaging device attached to the golf club in the direction including at least one identification feature attached to the golf club. By doing this, it is possible to easily measure the deformation of the golf club during the usual golf swing by the golfer.

It is a figure for demonstrating the measuring system of the deformation | transformation of the golf club by one embodiment of this invention. 5 is a flowchart for explaining a method of measuring deformation of a golf club according to an embodiment of the present invention. It is a figure for demonstrating the relationship of the projection surface of the imaging device shown in FIG. 1, and the head and shaft of a golf club. It is a graph which shows an example of the image of the golf club at the time of the golf swing imaged with the imaging device shown in FIG. It is a figure which shows an example of the time transition of the position of each marker in the X-axis direction on the projection plane of an imaging device. It is a figure which shows an example of the time transition of the position of each marker in the Y-axis direction on the projection plane of an imaging device. It is a figure which shows an example of the locus | trajectory on the projection surface of the marker on the head at the time of a golf swing. It is a figure which shows an example of the time transition of the relative angle of the head at the time of a golf swing with respect to the initial position of a head. It is a figure which shows an example of the locus | trajectory on the projection surface of the marker on the head at the time of a golf swing. It is a figure which shows an example of the locus | trajectory on the projection surface of the marker on the head at the time of a golf swing. It is a figure which shows an example of the locus | trajectory on the projection surface of the marker on the head at the time of a golf swing. It is a figure which shows an example of the time transition of the relative angle of the head at the time of a golf swing with respect to the initial position of a head. It is a figure which shows an example of the time transition of the relative angle of the head at the time of a golf swing with respect to the initial position of a head. It is a figure which shows an example of the time transition of the relative angle of the head at the time of a golf swing with respect to the initial position of a head.

Hereinafter, a measurement system, a measurement method, and a measurement apparatus of deformation of a golf club according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a view for explaining a measurement system 1 of golf club deformation according to an embodiment of the present invention. A measurement system 1 for golf club deformation shown in FIG. 1 includes a measurement device 2 and an imaging device 4 attached to the golf club 3. The golf club 3 includes a shaft 5, a head 6, and a grip 7 as in a conventional golf club.

The imaging device 4 is attached to the shaft 5 of the golf club 3 so that the optical axis is substantially parallel to the shaft axis of the shaft 5 in a direction including identification features to be described later. . The attachment position of the imaging device 4 on the shaft 5 is, for example, immediately below or in the vicinity of the grip 7 (directly in the illustrated example), a position where the golfer 8 can perform a usual golf swing. By attaching the imaging device 4 to such a position, the position of the imaging device 4 is less likely to be affected by the deformation of the golf club 3 during the golf swing, and an image of the golf club 3 is acquired over a wide range The advantage of being able to Even if the optical axis of the imaging device 4 is not parallel to the shaft axis, it does not matter as long as the identification feature (not shown) of the head 6 can be imaged through the golf swing.

The imaging device 4 is configured of, for example, a digital high speed camera or a wireless camera. The frame rate of the camera may be 30 fps (frames per second) or less for a wireless camera, and may be more than 30 fps for a digital high-speed camera. The imaging device 4 is lightweight to the extent that the golfer 8 can perform a usual golf swing using the golf club 3. Specifically, the weight of the imaging device 4 is preferably less than 90 g. More preferably, the imaging device 4 is 60 g or less. As shown in Table 1, when the weight of the imaging device 4 is 90 g or more, it can be seen that the head speed is significantly reduced, and when the imaging device 4 is 60 g or less, the head speed is hardly affected. If it is less than the speed reduction rate when the imaging device 4 is 90 g, it can be sufficiently used for actual measurement. For this reason, it is possible to measure the deformation of the golf club closer to the actual state in which the influence of the head speed is reflected. The weight of the imaging device 4 includes the weight of the camera body constituting the imaging device 4, the camera lens, and the member for attaching the imaging device 4 to the shaft 5.

Although not shown in FIG. 1, when the imaging device 4 is configured by a device other than a wireless camera, wiring between the imaging device 4 and the measuring device 2 is performed so as not to obstruct the golf swing by the golfer 8. There are also times when Note that, even when the imaging device 4 is configured by a device other than a wireless camera, when the removable storage medium can be incorporated in the imaging device 4, it is not necessary to draw the wiring.

The golf club 3 is provided with at least one identification feature (not shown) that can identify the position on the golf club. An identification feature is a feature that can be distinguished from other parts in image processing, for example, a logo mark or letters attached to the head of a commercially available golf club, and a marker as described in detail with reference to FIG. It may be M1 to M3. The identification feature is applied to the golf club 3 using, for example, a reflective tape, a paint or the like. Even if it is another material, if it is the material which contrast with a surrounding pixel becomes more than predetermined value on image processing, it can be used for an identification feature.

The measuring device 2 is configured of, for example, a personal computer or the like including a CPU (Central Processing Unit), and includes an image acquiring unit, a position information acquiring unit, and a measuring unit (not shown). Furthermore, the measuring apparatus 2 can also be provided with a display part, and can also be comprised so that the result of having measured deformation of a golf club may be displayed on a display part. The functions of the image acquisition unit, the position information acquisition unit, and the measurement unit will be described later with reference to FIG.

In the measurement system 1, when the golfer 8 performs a golf swing to launch the golf ball 9 using the golf club 3, the measurement device 2 performs a measurement process on the image captured by the imaging device 4, and the golfer 8 Measure the deformation of the golf club in the golf swing. Hereinafter, with reference to FIG. 2, the measurement method implemented in the measurement system 1 will be described in more detail.

FIG. 2 is a flow chart for explaining the method of measuring the deformation of the golf club according to one embodiment of the present invention. First, an image of a golf club during a golf swing is captured by the imaging device 4 (step S01). After that, the measuring device 2 acquires an image of the golf club at the time of golf swing, for example, the head 6, from the imaging device 4 by the image acquiring unit (step S02). The image of the golf club may be moving image data of any format captured by the imaging device 4.

The measuring device 2 extracts arbitrary image data from the moving image data captured by the imaging device 4 in step S01 by the position information acquiring unit, and recognizes and recognizes an identification feature on the head 6 for the extracted image data. The position information of the identification feature is acquired (step S03). For example, when the identification feature is circular as shown as markers M1 to M3 in FIG. 4, the position information acquisition unit extracts the identification feature by the circle fitting method, and acquires the coordinates of the center position as position information Do. Here, the coordinates are, for example, coordinates on the virtual projection plane 10 of the imaging device 4 described later with reference to FIGS. 3 and 4.

The measuring device 2 measures the deformation of the golf club based on the position information acquired in step S03 using the measuring unit (step S04). Specifically, the measurement unit can measure at least one of the movement of the head 6 and the bending of the shaft 5. Furthermore, the measurement unit may measure the movement of the head 6 and the bending of the shaft 5 based on the position of the head 6 with respect to the imaging device 4. At this time, the measurement unit measures the position of the imaging device 4 on the projection surface 10 as the position of the head 6. Furthermore, the measurement unit can also calculate the time transition of the position of the head 6 on the projection surface 10, and measure the movement of the head 6 and the transition of the state of the shaft 5 during the golf swing. Hereinafter, the steps S03 and S04 will be described in more detail by describing the projection surface 10 of the imaging device 4 with reference to FIGS. 3 and 4.

FIG. 3 is a view for explaining the relationship between the virtual projection surface 10 of the imaging device 4 shown in FIG. 1 and the head 6 and the shaft 5 of the golf club 3. The projection plane 10 is a plane perpendicular to the optical axis of the imaging device 4. The image pickup device 4 is attached to the shaft 5 via the attachment member 11. Is the shaft 5 of the portion to which the image pickup device 4 is attached less rigid than the head 6 and the portion of the shaft 5 near the head 6? There is virtually no risk. When the optical axis of the imaging device 4 and the shaft axis are parallel to each other, the shaft axis of the shaft 5 and the projection plane 10 are perpendicular to each other when no bending occurs.

In the case where the shaft 5 is bent during the golf swing and the

shaft

5a and 5b shown by broken lines are in a state, the shaft axis and the projection surface 10 are not perpendicular. Positional coordinates of the markers M1 to M3 on the head 6 in the projection plane 10 are represented by pixel positions corresponding to coordinate values of the X axis and the Y axis described at the lower left in FIG. The Z axis is an axis parallel to the optical axis of the imaging device 4. For the sake of clarity, the bends of the

shafts

5a and 5b are shown exaggeratingly, and the actually occurring bends are often smaller than shown.

FIG. 4 is a graph showing an example of an image of a golf club during a golf swing acquired from the imaging device 4 shown in FIG. The positions of the shaft 5 and the head 6 shown in the figure are the positions immediately before the impact at which the head 6 strikes the golf ball 9. On the upper surface of the head 6, markers M1 to M3 which are identification features are attached. Of course, there may be at least one identification feature, and it is of course possible to arrange three markers as shown, or arrange a plurality of markers in different manners. Markers M4 to M6 indicated by broken lines in the figure respectively correspond to the positions of the markers M1 to M3 at the start of the golf swing. In step S03, the position information acquiring unit of the measuring device 2 acquires the position information of each of the markers M1 to M3 as pixel coordinates with the lower left on the XY plane as the projection plane as the origin (0, 0). The position information of each of the markers M1 to M3 on the projection plane 10 is the relative position of the head 6 with respect to the imaging device 4.

In step S04, the measurement unit of the measurement device 2 can measure the curvature of the shaft 5 reflected in the relative position of the head 6 to the imaging device 4. Furthermore, by performing the same measurement using the golf club 3 having an arbitrary number of markers attached on the shaft 5, the aspect of the bending amount and the bending of the shaft 5 can be measured in more detail.

With respect to the movement of the head 6, for example, the measuring unit corresponds to a straight line connecting markers M4 and M5 (hereinafter referred to as M4-M5 line), which corresponds to the rotation behavior of the head 6 corresponding to the face direction of the head 6 at the beginning of the golf swing. It can be measured by calculating the angle formed by the straight line connecting M1 and M2 (hereinafter referred to as M1-M2 line). In this manner, the rotational behavior of the head 6 can be measured as a relative angle with respect to the face direction at the start of the golf swing of the head 6 at each point in time of the golf swing. Furthermore, it is considered that the twisting of the shaft can also be calculated using a predetermined model from the rotational behavior of the head.

Hereinafter, the step S04 will be described in more detail with reference to FIGS. 5 to 8. The measuring unit of the measuring device 2 can also obtain time transition of position information on the projection plane 10 of each of the markers M1 to M3 acquired by the position information acquiring unit as shown in FIG. FIG. 5 is a view showing the time transition of the positions of the markers M1 to M3 in the X-axis direction on the projection plane 10 of the imaging device 4. As shown in FIG. The horizontal axis indicates time (ms), and the vertical axis indicates the position (pixels) of each marker in the X-axis direction on the projection plane 10 of the imaging device. The point in time (ms) is 0 is an impact point at which the head 6 strikes the golf ball 9. From this figure, it can be seen that the markers M1 to M3 of the head 6 shift the position in the projection plane X axis direction to the left and right with a similar tendency toward the impact time point. More specifically, the markers M1 to M3 of the head 6 move leftward on the projection surface 10 in the X-axis direction immediately after the start of the golf swing, and then gradually move to the X-axis right on the projection surface 10 gradually. It moves in the direction, and moves to the left of the X axis on the projection surface 10 just before the impact, and reaches the point of impact.

FIG. 6 is a diagram showing the time transition of the position of each of the markers M1 to M3 in the Y-axis direction on the projection plane of the imaging device 4. As shown in FIG. The horizontal axis indicates time (ms), and the vertical axis indicates the position (pixels) of each marker in the Y-axis direction on the projection plane 10 of the imaging device. Similar to FIG. 5, the point in time (ms) is 0 is an impact point at which the head 6 strikes the golf ball 9. From this figure, it can be seen that the markers M1 to M3 of the head 6 vertically shift the position in the projection plane Y-axis direction with a similar tendency toward the point of impact. More specifically, the markers M1 to M3 of the head 6 swing up and down in the Y-axis direction on the projection surface 10 immediately after the start of the golf swing, then move rapidly in the Y-axis direction, and then halfway After dropping gently to the bottom, it drops sharply toward the impact.

As shown in FIGS. 5 and 6, according to the present embodiment, it is possible to measure the deformation of the golf club 3 reflected in the movement of the head 6. Furthermore, according to the present embodiment, it is also possible to obtain information of the locus on the projection surface 10 of the marker M1 on the head 6 in the golf swing as shown in FIG. The diamond marks shown on the plot of FIG. 7 indicate the impact. The locus of the marker M1 on the projection surface 10 of the imaging device 4 indicates how much the head 6 is displaced relative to the imaging device 4. The factor that contributes the most to the relative displacement of the head 6 with respect to the imaging device 4 is considered to be the tendency of the shaft 5 among the deformation of the golf club 3. Therefore, from the locus of the marker M1 as shown in FIG. 7, the bending of the shaft 5 at the time of golf swing can be measured.

Furthermore, the rotational behavior of the head can be measured as shown in FIG. This rotational behavior includes, for example, rotation in the toe-down direction, which is the direction in which the head 6 moves away from the shaft axis, and rotation in the striking direction about the shaft. In FIG. 8, the vertical axis represents relative angle, and the horizontal axis represents time (ms). The relative angles are the M1-M2 line and the M1-M3 line in the golf swing with respect to the M4-M5 line corresponding to the M1-M2 line at the start of the golf swing and the M4-M6 line corresponding to the M1-M3 line. Indicates the angle that each line makes. The plus indicates the rotation angle in the launch direction, and the minus indicates the rotation angle in the opposite direction. The solid line represents the time transition of the angle formed by the M1-M2 line of the head 6 with the M4-M5 line. The broken line shows the time transition of the angle that the M1-M3 line makes with the M4-M6 line. It can be seen from FIG. 8 that, immediately after the start of the golf swing, the face surface exhibits a positive rotation angle due to inertia, but then turns negative and the face surface gradually rotates in the positive direction toward the impact.

In FIG. 8, the change of the solid line is larger than the change of the broken line. This is considered to be due to bending of the shaft 5 as the head 6 moves in a so-called toe-down direction (direction in which the head 6 moves away from the shaft axis) during a golf swing. By further analyzing such data together with the measurement results of the shaft curvature as described above, it is also possible to analyze the correlation between the shaft curvature and the head movement.

As described above, the method according to the present embodiment does not need to use a plurality of imaging devices to measure the deformation of the golf club by the golfer 8, and can easily measure the movement of the head 6 during the golf swing. . In addition, in the said FIG.5, FIG.6, FIG.8, although the data regarding the motion of the head at the time of a golf swing and bending of a shaft were shown as time-lapse data, these can be acquired only as time-lapse data Absent. For example, it is also possible to obtain each data at any one time point of interest, such as at the time of impact. In this case, the deformation of the golf club 3 can be determined, for example, as a displacement from the state of the golf club 3 in a state where no deformation has occurred.

Next, results of application of the measurement system and the measurement method according to the present embodiment to a plurality of subjects will be described with reference to FIGS. 9 and 10. The measurement results shown in FIGS. 9A to 9C show trajectories on the projection surface 10 of the marker M1 on the head 6 at the time of golf swing, as in FIG. Similar to FIG. 8, the measurement results shown in FIGS. 10A to 10C show the temporal transition of the relative angle of the head 6 at the time of the golf swing with respect to the initial position of the head 6. In the figure, the phase of the golf swing is divided into a backswing (solid line), a downswing (broken line), and a follow through (dotted line). For example, by installing an imaging device for imaging the entire golf swing by the golfer 8 separately from the imaging device 4 or by providing the golf club 3 with a gyro sensor, it is possible to distinguish the phase of the golf swing. As described above, by distinguishing the phases of the golf swing, it becomes possible to compare and evaluate the measurement results of different types of golf swings for each phase.

As apparent from FIGS. 9A to 10C and 10A to 10C, the measurement results of each subject are different from each other. Therefore, it is considered that selection and development of a golf club suitable for each subject can be supported by determining the feature amount to be compared and the feature amount to be an index, and comparing and classifying the measurement results.

Although one embodiment of the present invention has been described, various modifications can be made in the claims. In the above embodiment, the golfer 8 is shown as a human, but according to the present invention, it is also possible to easily measure the deformation of the golf club at the time of the golf swing by the golfer of the robot. The robot's golfer can swing under certain conditions, and can easily determine, for example, the homogeneity of the characteristics among many products of the same specification.

Reference Signs List 1 measurement system 2 measurement device 3 golf club 4 imaging device 5 shaft 6 head 7 grip 9 golf ball

Claims

A measuring system for measuring the deformation of a golf club when the golfer swings the golf club,
An imaging device attached to the golf club in a direction including at least one identification feature attached to the golf club capable of identifying a position on the golf club;
A measuring device that measures deformation of the golf club based on position information of the at least one identification feature acquired from an image of the golf club at the time of a swing captured by the imaging device;
A measurement system of deformation of a golf club, comprising:
The measuring device is
An image acquisition unit for acquiring an image of the golf club at the time of swing from the imaging device;
A position information acquisition unit that recognizes the at least one identification feature from the acquired image and acquires position information of the recognized at least one identification feature;
The measuring system of the deformation | transformation of the golf club of Claim 1 which has a measurement part which measures the deformation | transformation of the said golf club based on the acquired said positional information.
The golf club deformation measurement system according to claim 1, wherein the at least one identification feature is provided on a head of the golf club.
The golf club deformation measuring system according to any one of claims 1 to 3, wherein the deformation of the golf club is at least one of the movement of the head of the golf club and the curvature of a shaft.
The system for measuring deformation of a golf club according to any one of claims 1 to 4, wherein the imaging device is less than 90 g.
A measuring method for measuring the deformation of a golf club when the golfer swings the golf club,
During a golf swing using a golf club having at least one identification feature that can specify a position on the golf club and an imaging device attached to a direction including the identification feature, the imaging device Capturing an image;
Acquiring an image of the golf club at the time of swing from the imaging device;
Recognizing the at least one identification feature from an image captured by the imaging device, and acquiring position information of the recognized at least one identification feature;
Measuring the deformation of the golf club based on the acquired position information;
How to measure the deformation of a golf club, including:
A measuring device for measuring the deformation of a golf club when the golfer swings the golf club,
The golf club at the time of a swing imaged by an imaging device attached to the golf club in a direction including at least one identification feature attached to the golf club that can locate the position on the golf club Measuring a deformation of the golf club based on position information of the at least one identification feature acquired from an image;
Measuring device of deformation of golf club.