JP5521265B2 - Swing display method and swing display system - Google Patents

Description

  The present invention relates to a swing display method and a swing display system for displaying an image on a display screen when a golfer swings a golf club.

  It is known that a golf swing form is an important element for accurately increasing the flight direction of a hit golf ball and increasing the flight distance. Finding a golf club suitable for one's own golf swing from among various golf clubs (club fitting) has been an important concern for golfers. Therefore, in order to find a golf club suitable for one's own golf swing, it has been desired to know directly and objectively the characteristics of his / her golf swing and to select from various golf clubs accordingly.

  At the time of club fitting and lessons, a golfer uses a CCD camera or a video camera to shoot a video when a golfer swings a golf club and displays the behavior of the swing plane and golf club on the display screen. Has been done.

  However, since a normal video camera can only shoot at 30 frames / second, image blur occurs between frames, and the swing operation cannot be fully grasped. On the other hand, when a high-speed video camera is used, it is naturally possible to shoot with higher accuracy than a normal video camera. However, when shooting with a high-speed video camera, high-brightness illumination is required, but the actual situation is that it is not at a practical level because the brightness is insufficient indoors such as in shops.

  In addition, regardless of which video camera is used for shooting, the angle of the golf club shaft and the like are read from the shot video, so quantitative evaluation is difficult. For example, from the back of the golfer (the back side of the golf ball hitting direction), the front (the hitting side of the golf ball), the front (the golfer's face side), the back (the same back side), etc. You can only get a rough numerical value, such as subtracting the number of angles to the ground.

  On the other hand, in Patent Document 1, a strain gauge is attached to a position facing the striking direction on the shaft of the golf club and a position facing the address direction perpendicular to the striking direction, and the output of the strain gauge during swing is used. Proposes a method of selecting a golf club suitable for one's own swing from various golf clubs according to the characteristics of the golf swing by measuring the deformation state of the shaft during the swing, and a device accompanying it. ing.

  Further, in Patent Document 2, at least one of the position and rotation angle of the shoulder, elbow, wrist, etc. during swing is obtained by a video camera, and a golfer's model is obtained based on this data by applying a beam element, truss element, finite element, etc. Golf club design that can be obtained by three-dimensional elements by the element method, etc., and obtain a model of a golf club whose design object can be changed by three-dimensional elements by the finite element method, etc. Proposed method. It is said that it is possible to select a golf club suitable for one's swing by using this.

  Furthermore, Patent Document 3 proposes a device that can shoot a swing form three-dimensionally using a plurality of video cameras and judge whether the swing form is good or not, and know the characteristics of one's own golf swing to some extent. It is supposed to be possible.

  On the other hand, the present applicant also uses a magnetic sensor attached to the tip of a grip of a golf club in Patent Document 4 to measure the position and angle of the grip end with high accuracy to express the behavior of the golf club. A method for creating stick pictures is proposed. Three-dimensional swing data measured using a magnetic sensor has the advantage that the data rate is sufficiently high and the measurement accuracy is sufficiently high.

  Patent Document 5 relates to a practical skill analysis system for learning a form in sports, exercise, dance, and the like, and a program therefor. In this document, a 3D skeleton model consisting of a wire frame image with a semi-transparent or transparent inside is displayed on a moving image obtained by capturing a learner's movement, or each part of a human body is displayed as a plurality of bar-like diagrams 3 It is disclosed that a stick model composed of a three-dimensional stick image is reproduced and displayed.

Japanese Patent Laid-Open No. 10-244023 JP-A-6-210027 Utility Model Registration No. 3050448 Japanese Patent No. 3624761 JP 2006-230630 A

  However, in the method of Patent Document 1, the actual swing is not directly measured, and by knowing the deformation state of the shaft, the swing form that has been conventionally categorized and the deformation state of the shaft are associated with each other. I just guessed the swing form from the deformation state. In addition, since the obtained time series data is only expressed by the distortion of the shaft, the swinging golfer cannot visually understand it.

  In addition, with the technique of Patent Document 2, the swing form can be visually seen directly, so the quality and characteristics of the swing form can be easily understood, but a plurality of video cameras are set so that no dead angle occurs in the swing. It is not easy to do. Also, since it is necessary to synchronize multiple video cameras, setting is not easy, and even if you set the video camera appropriately so that blind spots do not occur, the golf club head, grip part, etc. Data obtained by time-series movement of elbows and arms has low resolution and low resolution accuracy. In particular, there is a problem that the rotation angle data obtained by turning the wrist of the grip portion is difficult to measure and the accuracy is further lowered. In addition, since images are obtained using a plurality of video cameras, there is a problem that the amount of data becomes enormous and the data processing becomes complicated.

  In the method of Patent Document 3, model physical property data, shape data, and the like must be input, and complicated work is required before simulation. In addition, it is difficult to characterize a swing in a solid element model such as a beam element, a truss element, or a finite element method.

  Further, in the method of Patent Document 4, since the shaft direction is calculated based on the measurement result of the position and angle of the grip end, only the swing behavior of the golf club calculated based on the assumption that the shaft is a rigid body is obtained. It is done. That is, since only the behavior of a golf club not including a golfer is displayed as a moving picture as a three-dimensional picture, it can be recognized as a swing by a familiar person, but is difficult to recognize as a swing by a person who is not familiar.

  Furthermore, the technique of Patent Document 5 captures swing data such as a professional who becomes a model by so-called motion capture, and compares the learner's movements with them to compare the two. However, in motion capture, a marker is attached to each part of the body and the movement of each part of the body is captured, so the system becomes large and complicated. In addition, since the superposition of the two cannot be performed in real time, for example, it is not possible to try a club fitting or a lesson by trying immediately at a store.

  Therefore, the object of the present invention is to solve the problems based on the above-mentioned conventional technology, and display the captured video and its three-dimensional stick picture on the display screen in a simple and highly accurate real time. An object of the present invention is to provide a swing display method and a swing display system that can be used.

To achieve the above object, the present invention provides a swing display method for displaying a swing form of a golf club,
When the golf club swings the golf club, the three-dimensional magnetic sensor attached to the grip portion of the golf club acquires time-series data of the three-dimensional position coordinates and the posture angle of the grip portion in the swing, and the same swing Shoot the movement of the golfer inside with a video camera,
Based on the acquired time series data and the length of the shaft of the golf club, a three-dimensional stick picture representing the behavior of the golf club during the same swing is created every predetermined time,
As striking position and striking direction of the golf ball is substantially the same, overlapping the video of the operation of the golfer of the same in swing that the captured three-dimensional stick picture for each predetermined time during the same swing, or the The golf club swing of the golfer is arranged by arranging a three-dimensional stick picture for each predetermined time during the same swing and the photographed motion image of the golfer during the same swing so that the hitting directions of the golf balls are substantially the same. The present invention provides a swing display method characterized by displaying a form on a display screen.

  Here, the three-dimensional stick picture at every predetermined time during the swing and the captured video of the motion of the golfer during the swing may be displayed with the timing synchronized with respect to the hitting position of the golf ball. preferable.

  The data rate of the three-dimensional stick picture is preferably a positive integer multiple of the data rate of the photographed golfer's motion during swing.

In addition, a magnetic sensor is attached to one end of a rod-shaped object having a known length, and the three-dimensional position coordinates and posture angle data of one end of the rod-shaped object are acquired, and an image of the rod-shaped object is photographed with a video camera,
Based on the data of the three-dimensional position coordinates and the posture angle and the length of the shaft of the golf club, a three-dimensional stick picture of the rod-like object is created every predetermined time,
Displaying a three-dimensional stick picture of the rod-shaped object in a stationary state and an image of the photographed rod-shaped object in a stationary state on a display screen;
Via the input means, the magnification of the three-dimensional stick picture of the stick-like object is changed so that the length of the three-dimensional stick picture of the stick-like object and the video of the photographed stick-like object coincides, and the stick-like object Calibration is performed to move the display position of the three-dimensional stick picture of the stick-like object so that the tip position of one end and the tip position of the other end of the three-dimensional stick picture of the photograph and the image of the photographed stick-like object coincide with each other. Thus, it is preferable that the magnification information of the three-dimensional stick picture and the movement information of the display position of the three-dimensional stick picture are acquired.

  Here, before swinging the golf club, the calibration is performed, and using the magnification information and the movement information acquired by the calibration, a three-dimensional stick picture at a predetermined time during the swing Preferably, the golfer's motion image is displayed in an overlapping manner. In this case, it is preferable that the rod-shaped object is the golf club, one end of the rod-shaped object is a tip of the grip portion of the golf club, and the other end is a head-side tip of the shaft of the golf club.

  On the other hand, it is assumed that the rod-shaped object is the golf club, one end of the rod-shaped object is a tip of the grip portion of the golf club, and the other end is a tip of the golf club shaft on the head side. It is also preferable to perform the calibration after swinging.

The present invention also provides a three-dimensional position / direction measurement system that measures time-series data of three-dimensional position coordinates and posture angles of the grip part during swing by a magnetic sensor attached to the grip part of the golf club, and the same swing. a video camera for capturing an image when the golfer swings a golf club in, based on the length of the time-series data and the golf club shaft, the three-dimensional representative of the behavior of the golf club in the same swing A stick picture is created every predetermined time, and a three-dimensional stick picture for every predetermined time in the same swing is set so that the hitting position and hitting direction of the golf ball become substantially the same according to an instruction input via the input means a video of when the golfer during the same swing and to swing a golf club Sleeping, or the like striking direction of the golf ball is substantially the same, a video when the golfer in the same swing as 3D stick picture for each predetermined time during the same swing to swing a golf club A display control device that displays the display side by side on the display screen,
The display control device has a function of adjusting a magnification and a display position of a three-dimensional stick picture displayed on the display screen according to an instruction input via the input unit. Provide a system.

  According to the present invention, high-precision measurement (3D measurement) can be performed with a simple system using high-speed and high-precision data from a magnetic sensor. Also, by overlaying or displaying the video of a swinging golfer and its 3D stick picture at predetermined intervals, it is possible to achieve both quantitative data from the magnetic sensor and visual recognition from the video. Fitting and lessons in real time with high accuracy.

  Hereinafter, a swing display method and a swing display system of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

  FIG. 1 is a conceptual diagram of an embodiment showing a configuration of a swing display system of the present invention. A swing display system (hereinafter referred to as a display system) 30 shown in the figure includes an image when a golfer swings the golf club 12 for the purpose of fitting the golf club 12 or performing a golf lesson, and the golf club at that time. Are displayed on the screen of the display 26 so as to overlap or side by side with a three-dimensional stick picture for every predetermined time.

  The display system 30 is roughly divided into a three-dimensional position / direction measurement system (hereinafter referred to as a measurement system) 10, a video camera 21, and a display control device 11.

  The measurement system 10 includes a transmitter 18, a receiver 16, and a controller / data processing device 20.

  Here, as shown in FIG. 2, the transmitter 18 and the receiver 16 are each composed of three coils wound in a loop shape in three axial directions orthogonal to each other.

  The transmitter 18 generates three kinds of predetermined magnetic fields one after another, and is arranged and fixed behind the golfer who swings the golf club 12 as shown in FIG.

  On the other hand, the receiver 16 is a magnetic sensor that generates a triaxial output voltage according to the strength and direction of the magnetic field generated by the transmitter 18, and is positioned at one end of the shaft 13 of the golf club 12 that moves and rotates during swing. It is attached to the end of the grip portion 14 to be The receiver 16 may be provided in any range of the grip portion as long as the shaft 13 is less bent.

  As shown in FIG. 2, the controller / data processing apparatus 20 includes a drive circuit 20a, a detection circuit 20b, and a computer 20c.

  Here, the detection circuit 20b detects the output voltage input from the receiver 16, and outputs the detected output voltage. As shown in FIG. 1, the output voltage detected by the receiver 16 is sent to the transmitter 18 via the cable 19, and further input from the transmitter 18 to the detection circuit 20 b of the controller data processing device 20. The output voltage output from the detection circuit 20b is input to the computer 20c.

  On the other hand, the drive circuit 20a generates a drive signal for sequentially generating predetermined three types of magnetic fields in the transmitter 18 based on a command signal input from the computer 20c. A drive signal output from the drive circuit 20 a is input to the transmitter 18.

The computer 20c controls the drive circuit 20a according to the command signal, processes the output voltage input from the detection circuit 20b, sets a predetermined position, for example, the position of the transmitter 18 as a reference position, and three axes X, A three-dimensional position coordinate (x, y, z) with reference to Y, Z and a posture angle (Eulerian of the grip portion 14) indicating the orientation of the receiver 16 with respect to a predetermined reference direction, for example, the Y-axis direction with the transmitter 18 as the center. Angle), that is, yaw angle, pitch angle, and roll angle (hereinafter referred to as (θ _y , θ _p , θ _r )) are calculated and output.

In the measurement system 10, three types of predetermined magnetic fields are generated one after another from the transmitter 18. On the other hand, the receiver 16 senses magnetism corresponding to positions and orientations in the three types of magnetic fields created by the transmitter 18 and outputs a total of nine output voltages. In the controller / data processing device 20, the nine output voltages output from the receiver 16 are processed, and the three-dimensional position coordinates (x, y, z) and the angle (θ _y , θ _p , θ _r ) data is obtained.

  Subsequently, the video camera 21 captures an image when the golfer swings the golf club 12. In the example of FIG. 1, the front of the golfer is photographed, but as necessary, the golfer may photograph from the back, rear, and front. The video camera 21 may be either an analog system or a digital system, but the video captured by the video camera 21 is taken into a personal computer 22 described later and can be reproduced and displayed.

  Subsequently, the display control device 11 includes a personal computer (control means) 22, an input means 24, and a display (display means) 26.

The display control device 11 receives time series data of the three-dimensional position coordinates (x, y, z) and angles (θ _y , θ _p , θ _r ) of the grip portion 14 that is being input, which is input from the controller / data processing device 20. Based on the length of the shaft 13 of the golf club 12, a three-dimensional stick picture is created every predetermined time during the swing. Then, in accordance with an instruction input via the input means 24, an image when the golfer swings the golf club 12 and a three-dimensional stick picture for each predetermined time are superimposed or displayed on the screen of the display 26 side by side. To do.

  Here, the display control device 11 has a function of adjusting the magnification and the display position of the three-dimensional stick picture displayed on the screen of the display 26 in accordance with an instruction input via the input unit 24. The magnification and the display position are adjusted while viewing the still image image captured by the video camera 21 displayed on the screen of the display 26 and the corresponding three-dimensional stick picture of the still image so that the magnification and the display position of both coincide with each other. As described above, the operator performs the manual operation using the input means 24.

The configuration of the display system 30 is basically as described above.
Next, the swing display method of the present invention will be sequentially described.

  In the swing display method of the present invention, before swinging the golf club 12, the display control device 11 performs calibration for adjusting, for example, a magnification and a display position between a three-dimensional stick picture and a photographed motion image of the golfer during the swing. Perform

Subsequently, when swinging the golf club 12, three types of magnetic fields are generated one after another from the transmitter 18, and the magnetism in the three types of magnetic fields is detected by the receiver 16. Then, the controller / data processing device 20 calculates time-series data of the three-dimensional position coordinates (x, y, z) and angles (θ _y , θ _p , θ _r ) of the grip portion 14 during the swing. At the same time, the video camera 21 captures the motion of the swinging golfer.

Subsequently, based on the time series data of the three-dimensional position coordinates (x, y, z) and angles (θ _y , θ _p , θ _r ) of the grip portion 14 during swing and the length of the shaft 13 of the golf club 12. The golf swing is analyzed by the personal computer 22, and a three-dimensional stick picture is created every predetermined time during the swing.

  Finally, the golf ball's hitting position and hitting direction are almost the same, and the three-dimensional stick picture for every predetermined time during the swing is overlapped with the image of the golfer's action taken during the swing, or the golf The swing form of the golf club 12 of the golfer is displayed on the display 26 screen by aligning the three-dimensional stick picture for every predetermined time during the swing and the video of the motion of the golfer during the swing so that the ball striking directions are substantially the same. Display above.

Hereinafter, each process of the swing display method of this invention is demonstrated in order.
First, the calibration process will be described.

When the calibration is performed, for example, the golfer holds the grip portion 14 of the golf club 12 and suspends and holds the golf club 12 vertically (stationary state). In this state, the measurement system 10 acquires data of the three-dimensional position coordinates (x, y, z) and angles (θ _y , θ _p , θ _r ) of the grip portion 14. At the same time, the video camera 21 captures an image including the golfer and the entire golf club 12.

Subsequently, the display control device 11 uses the three-dimensional position coordinates (x, y, z) and angle (θ _y , θ _p , θ _r ) data of the grip portion 14 and the length of the shaft 13 of the golf club 12. Thus, a three-dimensional stick picture of the golf club 12 is created every predetermined time. Since the length of the golf club 12 is known, when creating a 3D stick picture, the length of the golf club of the 3D stick picture takes into account the angle of the golf club 12 and the actual golf club 12 Same as length.

It should be noted that the method of acquiring the data of the three-dimensional position coordinates (x, y, z) and the angles (θ _y , θ _p , θ _r ) of the grip portion 14, and the three-dimensional stick of the golf club 12 based on these data Details of the method of creating a picture will be described later.

  Subsequently, the display control device 11 displays a three-dimensional stick picture representing the golf club in a stationary state and a photographed image of the golf club 12 in a stationary state on the display 26 screen. Then, according to an instruction input via the input means 24, the magnification of the three-dimensional stick picture is changed so that the lengths of both golf clubs match, and the tip positions of both grip portions 14 and the golf club 12 are changed. The display position of the three-dimensional stick picture is moved so that the tip position on the head side of the shaft 13 matches.

  For example, on the video of the golf club 12 shot and displayed on the screen of the display 26, the tip position of the grip portion 14 and the tip position on the head side of the shaft 13 are clicked using the input means 24 such as a mouse. Thus, the coordinate position on the video is input. The magnification information and the movement information are obtained so that the tip positions on both sides of the stick of the three-dimensional stick picture coincide with these two coordinate positions.

  By performing the calibration described above, it is possible to obtain information on the magnification of the 3D stick picture and movement information on the display position of the 3D stick picture. Then, by using the magnification information of the 3D stick picture acquired by this calibration and the movement information of the display position, it is possible to display the 3D stick picture and the photographed golfer's motion image in an overlapping manner.

  Calibration only needs to be performed once before actually swinging the golf club 12. After calibration, even if the swinging golfer changes, the magnification and display position of the created 3D stick picture (one golf club in a vertical state) and the shot golf club 12 image should be the same. The displays (magnification and position) on the screens of the two displays are almost exactly the same.

  In addition, what is imaged at the time of calibration is not a golf club, but may be anything as long as it is a rod-shaped object whose length is known, such as a 1 m ruler. If the length is known, the three-dimensional stick picture can be created. Therefore, by superimposing the created three-dimensional stick picture and the image of the rod-shaped object having a known length on the display screen. Can be calibrated.

  It is not essential to perform the calibration process before performing the swing. For example, after performing a swing, a golfer swings a golf club (for example, in a stationary state at the time of addressing) and a 3D stick picture at that time by matching the magnification and the display position. May be used as a calibration process. In this case, the length of the golf club needs to be determined according to the inclination of the golf club, but the time required for the calibration process can be reduced.

Next, a process of acquiring time-series data of the three-dimensional position coordinates (x, y, z) and angles (θ _y , θ _p , θ _r ) of the grip part during swing will be described.

The time series data of the three-dimensional position coordinates (x, y, z) with respect to the reference position of the receiver 16 fixed to the grip portion 14 and the attitude angles (θ _y , θ _p , θ _r ) with respect to the reference direction are as follows. It is obtained as follows.

  As shown in FIG. 2, the drive circuit 20a outputs the same signal whose frequency and phase are always constant in accordance with a command signal from the computer 20c, and has three loop coils wound around the three axes of the transmitter 18. Energize sequentially. Each loop-like coil generates a different magnetic field each time it is excited, and based on this, the three loop-like coils wound around the three axes of the receiver 16 generate independent output voltages V. Since the three output voltages V generated in the three loop coils of the receiver 16 are obtained according to the three magnetic fields excited by the three loop coils of the transmitter 18, a total of nine output voltages V ( 3 × 3) output voltage V is obtained.

On the other hand, since the transmitter 18 that forms the magnetic field is fixedly installed at a predetermined position, the distribution regarding the strength and direction of the generated magnetic field is known with respect to the reference position and the reference direction where the transmitter 18 is installed. By using the nine output voltages V generated by the formed magnetic field, the three-dimensional position coordinates (x, y, z) of the receiver 16 with respect to the reference position and the posture angles (θ _y , θ _p , θ with respect to the reference direction). 6 unknowns of _r ) can be obtained.

That is, in the computer 20c, using the nine output voltages V sent from the detection circuit 20b, the data of the three-dimensional position coordinates (x, y, z) and the posture angles (θ _y , θ _p , θ _r ) are obtained. Find by calculation.

The three-dimensional position coordinates (x, y, z) and posture angles (θ _y , θ _p , θ _r ) obtained by the measurement system 10 are taken into the personal computer 22 and AD-converted, and the grip unit 14 is swinging. The time series data of the behavior of can be obtained.

  In the present embodiment, as shown in FIG. 2, the receiver 16 has a coil wound in a loop shape in the three axial directions orthogonal to each other. Therefore, one of the three axial directions is a shaft. The direction of the receiver 16 is determined and fixed to the end of the grip portion 14 of the golf club 12 so that one of the remaining two axial directions is aligned with the striking direction of the golf club 12. doing.

  Thus, from the time-series data of the rotation angle around the shaft axis of the golf club 12 and the wrist angle described later, that is, the angle indicating the orientation of the golf club 12 in the swing plane of the grip portion 14 during the swing, the grip portion The time-series data of the angles obtained by subtracting the arm angle indicating the position 14 can be easily obtained. This point is described in Japanese Patent No. 3624761 related to the present applicant. The direction of fixing the receiver 16 is not particularly limited, and the receiver 16 may be fixed in any direction. However, it is preferable that the receiver 16 is aligned and fixed by the above method.

  An example of such a measurement system 10 is LIBERTY (manufactured by Polhemus, USA). Conventionally, when a CCD video camera is used to perform measurement from image analysis, the sampling period of the captured image is 1/60 second and the resolution is 1 to 2 mm with respect to the position coordinates. The sampling period is 1/240 seconds, the position coordinates have a resolution of 0.8 mm, and the rotation angle has a resolution of 0.15 degrees. Therefore, since the sampling period is shorter than that of the conventional method and the resolution is high, more detailed information on the behavior of the grip portion 14 during the swing can be obtained.

  Also, with a CCD video camera, it is originally difficult to measure the rotation angle and wrist angle around the shaft axis of the golf club by measuring the image of the photographed image, even if a special jig is provided on the golf club. Even if it is possible, the rotation angle and wrist angle data around the shaft axis cannot be obtained with the same resolution as the measurement method using the magnetic field of the present invention, for example, with a resolution of 0.15 degrees as in LIBERTY.

Further, in LIBERTY, the swing data of about 2 seconds at most is added to the total of the three-dimensional position coordinates (x, y, z) and the posture angle (θ _y , θ _p , θ _r ) with a sampling period of 1/240 seconds, for example. Just get 6 data. For this reason, the amount of data handled is extremely small and the processing time is overwhelmingly faster than when taking a picture with a CCD video camera and performing measurement by image analysis.

  Further, in the conventional method of measuring the distortion of the shaft 13 by attaching a strain gauge or the like to the shaft 13, the distortion of the shaft 13 is measured, so that the golfer's golf is not affected by the deflection of the shaft 13. Swing behavior cannot be measured directly. On the other hand, in the present invention, the behavior of the golf swing of the golfer can be measured easily and quickly without being affected by the deflection caused by the shaft 13.

  Next, a process for creating a three-dimensional stick picture will be described.

  The process of creating a three-dimensional stick picture is processed by software in the personal computer 22 shown in FIG.

  In the personal computer 22, information on the viewpoint position and viewpoint direction of the acquired time-series data is preset by default. This default setting can be changed arbitrarily. The personal computer 22 recognizes the position and angle of the shaft portion 14 of the golf club 12 based on the acquired time-series data, and the shaft corresponding to the angle at that time based on the information on the length of the golf club 12. Recognize the length of 13 and create 3D stick picture data (3D data) every predetermined time (every predetermined data rate) during golf swing.

  Further, the personal computer 22 generates moving image data that reproduces the movement of the shaft 13 of the golf club 12 using data of a three-dimensional stick picture every predetermined time during golf swing. The moving image data corresponds to the length of the shaft 13 from the tip of the grip portion 14 of the golf club 12 to the tip of the head side when the golf swing is viewed based on the viewpoint position and viewpoint direction where the video camera 21 is installed. This shows the history of the stick trajectory (change over time). When moving image data is created, the data is corrected using information obtained by calibration.

  The moving image data is supplied to the display 26. The golfer can know the characteristics of his / her golf swing by viewing the video of his / her golf swing displayed on the screen of the display 26. Accordingly, for example, it is possible to quickly and easily select a golf club according to the characteristics of one's own golf swing. It can also be used for lessons such as correcting golf swings.

  Finally, a description will be given of a process in which an image when a golfer swings a golf club and a three-dimensional stick picture for every predetermined time in the swing are displayed on a display screen in a superimposed manner or side by side.

  The personal computer 22 is inputted with an image of a photographed golfer's action during the swing. Further, the personal computer 22 holds the data of the three-dimensional stick picture for each predetermined time during the created swing described above.

  The display control device 11 displays on the display 26 a screen of the photographed golfer's action (golf swing) during swing and a three-dimensional stick picture for each predetermined time. At this time, as shown in FIG. 6, the three-dimensional stick picture for every predetermined time and the image of the golfer's action during the swing are superimposed so that the hitting position and hitting direction of the golf ball are substantially the same. The swing form of the golf club 12 of the golfer is displayed on the display 26 screen.

  Alternatively, as shown in FIG. 7, the golf club's golf club 12 is arranged by arranging a three-dimensional stick picture for every predetermined time and an image of the action of the golfer during a swing shot so that the hitting directions of the golf balls are substantially the same. The swing form is displayed on the display 26 screen. The order of arrangement is not limited. For example, either a horizontal arrangement or a vertical arrangement may be used, and either may be arranged on the right side or the left side.

  Here, when the calibration process is completed, the magnification and the display position of the photographed image of the golfer's movement during the swing and the three-dimensional stick picture for each predetermined time have already been adjusted so as to closely match each other. . If the calibration process has not been completed, after the first swing, the magnification and display position of a part of the image when the golfer swings the golf club and the 3D stick picture for each predetermined time It is necessary to work together.

  As described above, the two are overlapped or displayed side by side on the screen of the display 26, and the timing of the playback display is synchronized with the impact position (hitting position) between the head portion and the golf ball as a reference, and the golfer swings. Play back the operation (movie data). The example shown in FIGS. 8 to 10 shows the state in which the moving image data of the three-dimensional stick picture shown in FIGS. 6 to 7 is reproduced and displayed in three stages.

  For example, a time-series three-dimensional stick picture (data rate = 240 Hz) acquired by the receiver 16 and an image of a swinging golfer (data rate = 30 Hz) captured by the video camera 21 such as a home video are used as the impact position. Is used as a reference, and the timing of playback display is synchronized, and the three-dimensional stick picture for each predetermined time and the captured golfer's video are superimposed on each other or displayed side by side on the display 26 screen.

  In particular, when a three-dimensional stick picture and a golfer's video are displayed in an overlapped manner at a predetermined time, the stick of the three-dimensional stick picture is interpolated between jumping golf clubs that are photographed and displayed by the video camera 21. Is displayed, and the history of the golf club trajectory during the golf swing is displayed, so that it is easy to find out the disadvantages and advantages of the golf swing behavior.

  Here, the playback display method is, for example, the playback with the playback button and the stop with the stop button, as in the normal video playback display method. In addition, it has a variety of functions such as pause (pause), frame advance, fast forward, and rewind.

  In the case of the above example, while the image of the swinging golfer is played for one frame (1/30 second), the eight-times of the eight-dimensional 3D stick picture is played back with high definition without blurring. The The predetermined time is not limited to 8 times, but may be a positive integer multiple.

  In this way, by making the data rate (predetermined time) of the three-dimensional stick picture a positive integer multiple of the data rate of the video of the swinging golfer, it is possible to synchronize the playback display timing of the entire swing. . By synchronizing the entire swing, for example, it is possible to present accurate data such as the angle of the golf club 12 when the golfer's arm is in this position.

  According to the present invention, high-precision measurement (3D measurement) can be performed with a simple system using high-speed and high-precision data from a magnetic sensor. Also, by overlaying or displaying the video of a swinging golfer and its 3D stick picture at predetermined intervals, it is possible to achieve both quantitative data from the magnetic sensor and visual recognition from the video. Fitting and lessons in real time with high accuracy.

  Note that the present invention is not limited to the swing of a golf club, but can be similarly applied to a case where a swing when swinging a hitting tool is displayed, such as a swing of a baseball bat, tennis or badminton racket. .

The present invention is basically as described above.
The swing display method and the swing display system of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiment, and various improvements and modifications may be made without departing from the spirit of the present invention. Of course.

It is a conceptual diagram of one Embodiment showing the structure of the swing display system of this invention. It is a conceptual diagram showing the structure of the three-dimensional position direction measurement system used with the swing display system shown in FIG. It is a conceptual diagram showing the swing surface of a golf swing. It is a conceptual diagram showing a swing orbit circle. (A) is a conceptual diagram showing an arm angle and a wrist angle, (b) is a conceptual diagram showing the rotation angle of a shaft. FIG. 5 is a conceptual diagram showing a state in which a swing form of a golf club of a golfer is displayed on a display screen by superimposing a captured three-dimensional stick picture for every predetermined time during a swing and a photographed golfer's motion during a swing. It is a conceptual diagram showing a state in which a swing form of a golf club of a golfer is displayed on a display screen by arranging a three-dimensional stick picture at every predetermined time during a swing and a captured video of a golfer's movement during a swing. It is a conceptual diagram showing a mode that the three-dimensional stick picture in swing is reproduced and displayed. FIG. 9 is a conceptual diagram illustrating a state in which a swinging three-dimensional stick picture is reproduced and displayed following FIG. 8. FIG. 10 is a conceptual diagram illustrating a state in which a swinging three-dimensional stick picture is reproduced and displayed following FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 3D position direction measurement system 11 Display control apparatus 12 Golf club 13 Shaft 14 Grip part 16 Receiver 18 Transmitter 19 Cable 20 Controller / data processing apparatus 21 Video camera 22 Personal computer 24 Input means 26 Display 30 Swing display system

Claims (8)

A swing display method for displaying a swing form of a golf club,
When the golf club swings the golf club, the three-dimensional magnetic sensor attached to the grip portion of the golf club acquires time-series data of the three-dimensional position coordinates and the posture angle of the grip portion in the swing, and the same swing Shoot the movement of the golfer inside with a video camera,
Based on the acquired time series data and the length of the shaft of the golf club, a three-dimensional stick picture representing the behavior of the golf club during the same swing is created every predetermined time,
As striking position and striking direction of the golf ball is substantially the same, overlapping the video of the operation of the golfer of the same in swing that the captured three-dimensional stick picture for each predetermined time during the same swing, or the The golf club swing of the golfer is arranged by arranging a three-dimensional stick picture for each predetermined time during the same swing and the photographed motion image of the golfer during the same swing so that the hitting directions of the golf balls are substantially the same. A swing display method comprising displaying a form on a display screen.   A three-dimensional stick picture for every predetermined time during the swing and a video of the photographed golfer's movement during the swing are displayed in synchronization with timing based on the hitting position of the golf ball. The swing display method according to claim 1.   3. The swing display method according to claim 1, wherein a data rate of the three-dimensional stick picture is a positive integer multiple of a data rate of an image of the photographed golfer's motion during the swing. A magnetic sensor is attached to one end of a rod-shaped object having a known length, and the three-dimensional position coordinates and posture angle data of one end of the rod-shaped object are acquired, and an image of the rod-shaped object is photographed with a video camera,
Based on the data of the three-dimensional position coordinates and the posture angle and the length of the shaft of the golf club, a three-dimensional stick picture of the rod-like object is created every predetermined time,
Displaying a three-dimensional stick picture of the rod-shaped object in a stationary state and an image of the photographed rod-shaped object in a stationary state on a display screen;
Via the input means, the magnification of the three-dimensional stick picture of the stick-like object is changed so that the length of the three-dimensional stick picture of the stick-like object and the video of the photographed stick-like object coincides, and the stick-like object Calibration is performed to move the display position of the three-dimensional stick picture of the stick-like object so that the tip position of one end and the tip position of the other end of the three-dimensional stick picture of the photograph and the image of the photographed stick-like object coincide with each other. The swing display method according to any one of claims 1 to 3, further comprising: acquiring magnification information of the three-dimensional stick picture and movement information of a display position of the three-dimensional stick picture.   Before swinging the golf club, the calibration is performed, and using the magnification information and the movement information obtained by the calibration, a three-dimensional stick picture for each predetermined time during the swing and the golfer's The swing display method according to claim 4, wherein the motion image is displayed in an overlapping manner.   6. The golf club according to claim 5, wherein the rod-shaped object is the golf club, one end of the rod-shaped object is a tip of the grip portion of the golf club, and the other end is a head-side tip of the shaft of the golf club. The swing display method described.   The golf club was swung on the assumption that the rod-shaped object was the golf club, one end of the rod-shaped object was the tip of the grip portion of the golf club, and the other end was the tip of the head side of the shaft of the golf club. The swing display method according to claim 4, wherein the calibration is performed later. A three-dimensional position / direction measurement system that measures time-series data of the three-dimensional position coordinates and posture angles of the grip part during the swing by a magnetic sensor attached to the grip part of the golf club, and the golf club during the same swing A video camera that shoots an image when swinging the image, and a three-dimensional stick picture representing the behavior of the golf club during the same swing based on the time-series data and the length of the shaft of the golf club at predetermined time intervals. created, in accordance with an instruction inputted through the input means, so that the striking position and striking direction of the golf ball is substantially equal, the three-dimensional stick picture for each predetermined time during the same swing in the same swing Superimposed with the image of the golfer swinging the golf club, or The so striking direction of the golf ball is substantially the same, wherein the 3-dimensional stick pictures every predetermined time in the same swing golfer during the same swing side by side and image at the time of swinging a golf club display screen And a display control device for displaying on
The display control device has a function of adjusting a magnification and a display position of a three-dimensional stick picture displayed on the display screen according to an instruction input via the input unit. system.

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