JP2018027188A - System and method for determination of sports hitting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system and a method for determination of a sports hitting tool allowing for determination of the sports hitting tool based on an index with little variation, the sports hitting tool being suitable for a user using the sports hitting tool.SOLUTION: A system 1 for determination of a sports hitting tool is provided for determining the sports hitting tool 20 suitable for a user 10 using the sports hitting tool 20. The system 1 comprises: a position acquisition unit 33a observing, for a plurality of sports hitting tools 20, an operation of the user 10 with a marker M attached to a portion of a body to hit an object 40 multiple times, and acquiring the position of the marker M for each operation; a standard deviation calculation unit 33b calculating the standard deviation of the position of the marker M acquired for each sports hitting tool 20; and an adequacy determination unit 33c calculating, for each of the sports hitting tool 20, the sum total of the standard deviation in a predetermined time before and after the sports hitting tool 20 comes in contact with the object 40, and determining the adequacy to the user 10 of each sports hitting tool 20 based on the sum total of the standard deviation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sport hitting determination system and a sport hitting determination method for determining a sport hitting tool suitable for a user who uses the sport hitting tool.

  In modern times, sports are performed in a wide range of ages from young people to the elderly. Many sports use striking tools such as rackets and bats. In order to enjoy such sports, it is very important for each player to select a hitting tool suitable for him / her.

  2. Description of the Related Art Conventionally, a system that presents a judgment material for selecting a suitable one for a player from a plurality of sports hitting tools used for the same sport is known. For example, in the analysis system described in Patent Document 1, the player's swing motion is sampled for each of a plurality of tennis rackets. Specifically, the displacement of the mark attached to a predetermined portion of the tennis racket is measured for each swing operation. Based on the measured displacement, various indexes such as the speed and acceleration of the racket or the ball hit by the racket are calculated and displayed on the display unit. Thereby, the operator of the analysis system can compare the values of a plurality of tennis rackets for each index, and can also determine compatibility with the player from the values of the plurality of indices for each tennis racket. Further, Patent Document 1 describes that a variation in index values such as acceleration is analyzed for each tennis racket, and a tennis racket with a small variation is recommended.

JP 2013-99525 A

  However, in the analysis system described in Patent Document 1, since the mark is attached to the tennis racket, even if the measurement is performed a plurality of times using the same tennis racket, the grip strength and position of the player's grip are always measured. It is not necessarily the same, and it affects the reproducibility of the impact action on the ball. For this reason, there is a problem in the reliability of the measurement result. Further, the analysis system described in Patent Document 1 does not take into consideration subjective factors such as player's preference or what kind of influence is exerted in actual play.

  The present invention solves the above-mentioned problems of the prior art and can determine or determine a sport hitting tool suitable for a user who uses the sport hitting tool by highly reliable measurement. The purpose is to provide.

According to the first aspect of the present invention, there is provided a sports hitting determination system for determining a sports hitting tool suitable for a user who uses the sports hitting tool.
For a plurality of sports hitting tools, the user who put a marker on a part of the body observes the action of hitting the object multiple times, and for each action, a position acquisition unit that acquires the position of the marker;
For each sport hitting tool, a standard deviation calculating unit for calculating a standard deviation of the position of the acquired marker,
For each sport hitting tool, calculate the sum of the standard deviations at a predetermined time before and after the sport hitting tool contacts the object, and based on the sum of the standard deviations, determine the appropriateness of each sport hitting tool for the user. A sports hitting tool determination system including an appropriate determination unit for determination is provided.

In the first aspect, the predetermined time is a time from time T1 to time T2 before and after the sport hitting tool contacts the object, and the standard deviation at time t between time T1 and time T2 is Vf ( tg), Vg which is the sum of the standard deviations can be obtained by the following equation (1).

  In the first aspect, the position acquisition unit may acquire the position of the marker in the vertical direction from the ground and / or the position in the direction orthogonal to the moving direction of the object hit by the sports hitting tool. Good.

  In the first aspect, the marker may be attached to the wrist or elbow of the user's dominant arm.

  In the first aspect, the sports hitting tool may be a badminton racket, a golf club, or a tennis racket.

According to the second aspect of the present invention, there is provided a sports hitting determination method for determining a sports hitting tool suitable for a user who uses the sports hitting tool.
For a plurality of sports hitting tools, the user who put a marker on a part of the body observes the motion of hitting the object multiple times, and for each motion, acquiring the position of the marker;
For each sport hitting tool, calculating a standard deviation of the acquired marker position;
For each sport hitting tool, calculate the sum of the standard deviations at a predetermined time before and after the sport hitting tool contacts the object, and based on the sum of the standard deviations, determine the appropriateness of each sport hitting tool for the user. And determining a sport hitting tool determination method.

In the second aspect, the predetermined time is a time from time T1 to time T2 before and after the sport hitting tool contacts the object, and the standard deviation at time t between time T1 and time T2 is Vf ( tg), Vg which is the sum of the standard deviations can be obtained by the following equation (2).

  In the second aspect, the position acquisition unit may acquire the position of the marker in the vertical direction from the ground and / or the position in the direction perpendicular to the moving direction of the object hit by the sports hitting tool. Good.

  In the second aspect, the marker may be attached to the wrist or elbow of the user's dominant arm.

  In the second aspect, the sports hitting tool may be a badminton racket, a golf club, or a tennis racket.

  According to the first and second aspects of the present invention, a sport hitting tool suitable for a user who uses the sport hitting tool can be determined based on an index with less variation.

It is a block diagram which shows the structure of the sport hitting tool appropriateness determination system which concerns on embodiment of this invention. It is a figure which shows the player of badminton and the marker attached to a part of player's body. It is a flowchart which shows the suitability determination method by the sport hitting tool suitability determination system which concerns on embodiment of this invention. It is a graph which shows the standard deviation of the vertical position of the marker M in the smash operation | movement of the experiment collaborator 1 in time series, when FIG. 4 (a) uses the racket A and FIG.4 (b) uses the racket B. FIG. 4C shows a case where the racket C is used. It is a graph which shows the standard deviation of the vertical position of the marker M in the smash operation | movement of the experiment collaborator 2 in a time series, FIG.5 (a) is the case where the racket A is used, FIG.5 (b) is the case where the racket B is used. FIG. 5C shows the case where the racket C is used. It is a graph which shows the standard deviation of the vertical position of the marker M in the smash operation | movement of the experiment cooperator 3 in a time series, FIG.6 (a) is the case where the racket A is used, FIG.6 (b) is the case where the racket B is used. FIG. 6C shows the case where the racket C is used. It is a graph which shows the standard deviation of the vertical position of the marker M in the smash operation | movement of the experiment collaborator 4 in a time series, FIG.7 (a) is the case where the racket A is used, FIG.7 (b) is the case where the racket B is used. FIG. 7C shows a case where the racket C is used. It is a graph which shows the standard deviation of the vertical position of the marker M in the smash operation | movement of the experiment cooperator 5 in time series, when FIG. 8 (a) uses the racket A and FIG.8 (b) uses the racket B. FIG. 8C shows the case where the racket C is used. FIG. 9A is a graph showing the standard deviation of the vertical position of the marker M in the smash operation of the experiment collaborator 6 in time series. FIG. 9A shows the case where the racket A is used, and FIG. 9B shows the case where the racket B is used. FIG. 9C shows the case where the racket C is used. It is a graph which shows the standard deviation of the vertical position of the marker M in the smash operation | movement of the experiment cooperator 7 in a time series, FIG.10 (a) is the case where the racket A is used, FIG.10 (b) is the case where the racket B is used. FIG. 10C shows the case where the racket C is used. It is a graph which shows the standard deviation of the vertical position of the marker M in the smash operation | movement of the experiment cooperator 8 in time series, when FIG. 11 (a) uses the racket A, FIG.11 (b) uses the racket B FIG. 11C shows the case where the racket C is used. It is a graph which shows the standard deviation of the vertical position of the marker M in the smash operation | movement of the experiment cooperator 9 in a time series, FIG.12 (a) is the case where the racket A is used, FIG.12 (b) is the case where the racket B is used. FIG. 12C shows the case where the racket C is used. It is a graph which shows the standard deviation of the vertical position of the marker M in the smash operation | movement of the experiment collaborator 10 in a time series, FIG.13 (a) is the case where the racket A is used, FIG.13 (b) is the case where the racket B is used. FIG. 13C shows the case where the racket C is used. It is a graph which shows the standard deviation of the vertical position of the marker M in the smash operation | movement of the experiment cooperator 11 in a time series, FIG.14 (a) is the case where the racket A is used, FIG.14 (b) is the case where the racket B is used. FIG. 14C shows a case where the racket C is used. It is the table | surface which put together the sum total of the standard deviation at the time of using each racket for every experiment cooperator. It is the table | surface which put together the question item in the questionnaire survey conducted with respect to each experiment cooperator. It is a figure which shows the evaluation criteria in the questionnaire survey conducted with respect to each experiment cooperator. It is a radar chart which shows the evaluation result of the experiment cooperator 1. 6 is a radar chart showing an evaluation result of an experiment collaborator 2; 4 is a radar chart showing the evaluation results of an experiment collaborator 3; 6 is a radar chart showing an evaluation result of an experiment collaborator 4; 7 is a radar chart showing the evaluation results of an experiment collaborator 5; It is a radar chart which shows the evaluation result of the experiment cooperator 6. It is a radar chart which shows the evaluation result of the experiment cooperator 7. 7 is a radar chart showing an evaluation result of an experiment cooperator 8; 6 is a radar chart showing an evaluation result of an experiment cooperator 9; 3 is a radar chart showing the evaluation results of an experiment collaborator 10; It is a radar chart which shows the evaluation result of the experiment cooperator 11. It is the table | surface which put together the sum total of evaluation with respect to each racket for every experiment collaborator. It is the table | surface which put together the hit number of the shuttle at the time of using each racket for every experiment collaborator. It is a graph which shows the speed of the vertical direction of the marker M in the smash operation | movement of the experiment cooperator 1 in a time series. It is a graph which shows the speed of the marker M in the vertical direction in the smash operation of the experiment collaborator 2 in time series. It is a graph which shows the speed of the vertical direction of the marker M in a smash operation | movement of the experiment collaborator 3 in time series. It is a graph which shows the speed of the vertical direction of the marker M in the smash operation | movement of the experiment cooperator 4 in time series. It is a graph which shows the speed of the vertical direction of the marker M in the smash operation | movement of the experiment cooperator 5 in time series. It is a graph which shows the speed of the vertical direction of the marker M in the smash operation | movement of the experiment cooperator 6 in time series. It is a graph which shows the speed of the vertical direction of the marker M in the smash operation | movement of the experiment cooperator 7 in time series. It is a graph which shows the speed of the vertical direction of the marker M in the smash operation | movement of the experiment cooperator 8 in time series. It is a graph which shows the speed of the vertical direction of the marker M in the smash operation | movement of the experiment cooperator 9 in time series. It is a graph which shows the speed of the vertical direction of the marker M in the smash operation | movement of the experiment cooperator 10 in time series. It is a graph which shows the speed of the vertical direction of the marker M in the smash operation | movement of the experiment cooperator 11 in a time series. FIG. 42A is a graph showing the standard deviation of the vertical position of the marker M in a time series when the smashing operation is performed with the marker M attached to the wrist. FIG. 42A shows a case where the racket A is used, and FIG. When the racket B is used, FIG. 42 (c) shows the case where the racket C is used. FIG. 43A is a graph showing the standard deviation of the vertical position of the marker M in a time series when the smashing operation is performed with the marker M attached near the upper end of the grip. FIG. 43A shows a case where the racket A is used. (B) shows the case where the racket B is used, and FIG. 43 (c) shows the case where the racket C is used. It is the table | surface which put together the sum total of the standard deviation for every racket when the marker M was attached to a wrist, and the sum total of the standard deviation for every racket when the marker M was attached to the upper end part vicinity of a grip. FIG. 45A is a graph showing the standard deviation of the vertical position of the marker M in the golf swing motion of the experimental collaborator 1 in time series. FIG. 45A shows the case where the driver A is used, and FIG. Indicates the case where the case is used. 46 is a graph showing the standard deviation of the vertical position of the marker M in time series in the golf swing operation of the experimental collaborator 2, FIG. 46A shows the case where the driver A is used, and FIG. FIG. 46C shows a case where the driver C is used. 47 is a graph showing the standard deviation of the vertical position of the marker M in the golf swing motion of the experimental collaborator 3 in a time series. FIG. 47A shows the case where the driver A is used, and FIG. FIG. 47C shows the case where the driver C is used. It is the table | surface which put together the sum total of the standard deviation at the time of using each driver for every experiment cooperator. It is a graph which shows the standard deviation of the vertical position of the marker M in the golf swing movement of the experiment collaborator 1 in time series. FIG. 49A shows the case where the iron A is used, and FIG. In this case, FIG. 49C shows a case where the iron C is used. It is a graph which shows the standard deviation of the vertical position of the marker M in the golf swing operation | movement of the experiment cooperator 2 in time series, when FIG. 50 (a) uses the iron A and FIG. 50 (b) uses the iron B. In this case, FIG. 50C shows a case where the iron C is used. It is a graph which shows the standard deviation of the vertical position of the marker M in the golf swing operation | movement of the experiment collaborator 3 in time series, when FIG. 51 (a) uses the iron A and FIG.51 (b) used the iron B. In this case, FIG. 51C shows a case where the iron C is used. It is the table | surface which put together the sum total of the standard deviation at the time of using each iron for every experiment collaborator. FIG. 53A is a graph showing the standard deviation of the vertical position of the marker M in the tennis stroke motion of the experiment collaborator 1 in a time series. FIG. 53A shows a case where the tennis racket C is used, and FIG. When used. FIG. 54A is a graph showing the standard deviation of the vertical position of the marker M in the tennis stroke motion of the experiment collaborator 2 in time series. FIG. 54A shows the tennis racket C, and FIG. When used. FIG. 55A is a graph showing the standard deviation of the vertical position of the marker M in the tennis stroke motion of the experiment collaborator 3 in time series. FIG. 55A shows a case where the tennis racket C is used, and FIG. When used. It is the table | surface which put together the sum total of the standard deviation at the time of using each tennis racket for every experiment cooperator.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. The embodiment described below is merely an example of the present invention, and it is needless to say that the embodiment of the present invention can be changed as appropriate without departing from the gist of the present invention.

  The sport hitting tool determination system 1 according to the embodiment of the present invention can be used to determine appropriateness of a sport hitting tool used in various sports hitting an object such as a ball. In the following, a case where a plurality of badminton rackets having different lengths, weights, and barycentric positions are selected as appropriate for the player will be described as an example.

  As shown in FIG. 1, the sports hitting tool determination system 1 is mainly based on a motion capture camera 2 that captures an action of a player hitting a badminton shuttle, and an image captured by the motion capture camera 2. And an appropriateness determining device 3 for determining the appropriateness of the racket.

  As shown in FIG. 2, when shooting with the motion capture camera 2, a marker M is attached in advance to the wrist of the dominant arm (right arm in FIG. 2) on which the player 10 holds the racket 20. Then, the motion capture camera 2 captures an action in which the player 10 smashes the shuttle 40 falling from the upper front of the player 10 with the racket 20 (hereinafter referred to as “smash action”). In the present embodiment, the motion capture camera 2 captures a plurality of smash operations for each racket 20 in order to determine the suitability for the player 10 for each of a plurality of different rackets 20.

  The appropriateness determination apparatus 3 is realized by installing an appropriateness determination program stored in a computer-readable recording medium in a computer. The appropriateness determination program is software for determining the appropriateness of the plurality of rackets 20 with respect to the player 10 based on the image data captured by the motion capture camera 2. The appropriateness determination program causes the appropriateness determination device to execute an operation described later.

  As shown in FIG. 1, the suitability determination device 3 mainly includes an interface 31, a storage unit 32, a control unit 33, an input unit 34, and a display unit 35, which are connected to each other via a bus 36. Yes. The interface 31 is an interface for connecting to an external device such as the motion capture camera 2. The storage unit 32 is configured by a built-in or external hard disk or the like, and stores an appropriateness determination program, image data taken by the motion capture camera 2, and the like. The control unit 33 includes a CPU, a ROM, a RAM, and the like, and functions as a position acquisition unit 33a, a standard deviation calculation unit 33b, and an appropriate determination unit 33c by reading and executing an appropriate determination program from the storage unit 32. To do. The input unit 34 is a user interface that receives an operation from the user with respect to the suitability determination device 3, and includes, for example, a mouse, a keyboard, a touch panel, and the like. The display unit 35 is a user interface for displaying various types of information, and can be a liquid crystal display or the like.

  Next, an appropriateness determination method in the sport hitting tool determination system 1 will be described with reference to the flowchart of FIG.

  First, in step S <b> 1, the motion capture camera 2 captures a plurality of smash operations of the player 10 for each of the plurality of rackets 20. In the present embodiment, the smash operation when the player 10 accurately captures the shuttle 40 with the racket 20 and the shuttle 40 flies in the direction intended by the player 10 is taken as an object to be photographed. For this reason, an operation when the shuttle 40 does not hit an appropriate position of the racket 20 or when the shuttle 40 is swung is not included in the shooting target. In addition, each smash operation is taken as a subject of shooting from the time when the player 10 starts the take-back operation of the racket 20 to the time when the shuttle 40 is finished. In addition, in order to compare the appropriateness of the plurality of rackets 20 fairly, it is desirable that the number of smash operations to be photographed be unified among the plurality of rackets 20. And the image data image | photographed with the motion capture camera 2 is memorize | stored in the memory | storage part 32 of the appropriateness determination apparatus 3 in the state divided for every racket 20. FIG.

  In step S <b> 2, the position acquisition unit 33 a of the control unit 33 analyzes the image data stored in the storage unit 32, thereby acquiring the position of the marker M attached to the wrist of the dominant arm of the player 10. Specifically, for the first smash operation using the first racket 20, the vertical position of the marker M from the ground (hereinafter also referred to as “the Z position of the marker M”) for each sampling time. And is stored in the storage unit 32. Here, the Z position of the marker M represents the height of the wrist of the player 10 from the ground during the smash operation. And the position acquisition part 33a repeats the process similar to the case of the 1st smash operation | movement also about the smash operation | movement after the 2nd time using the 1st racket 20. FIG. Thereby, the data of the Z position of the marker M in the smash operation using the first racket 20 is stored in the storage unit 32 a plurality of times for each sampling time. Furthermore, the position acquisition unit 33a repeats the same processing as that for the first racket 20 for the second and subsequent rackets 20 as well. Thereby, the data of the Z position of the marker M in the smash operation is stored in the storage unit 32 for a plurality of times for the second and subsequent rackets 20 as well.

  In step S3, the standard deviation calculation unit 33b of the control unit 33 calculates the variation in the Z position of the marker M at each sampling time, that is, the standard deviation, for each racket 20. Specifically, first, with respect to the first racket 20, the Z position data of the marker M stored in the storage unit 32 is read a plurality of times, and the standard deviation of the Z position of the marker M is calculated at each sampling time, The calculated standard deviation value is stored in the storage unit 32. Then, the standard deviation calculation unit 33b repeats the same processing as that for the first racket 20 for the second and subsequent rackets 20 as well. Thereby, also about the racket 20 after the 2nd, the value of the standard deviation of the Z position of the marker M is memorize | stored for every sampling time.

このようにして算出された標準偏差の総和Ｖｇは、一本目のラケット２０のプレイヤ１０に対する適正を判定するための材料として、記憶部３２に記憶される。そして、適正判定部３３ｃは、二本目以降のラケット２０についても一本目のラケット２０と同様の処理を繰り返す。これにより、二本目以降のラケット２０についても、プレイヤ１０に対する適正を判定するための材料としての標準偏差の総和Ｖｇが、記憶部３２に記憶される。この標準偏差の総和Ｖｇは、サンプリング時刻Ｔ１からＴ２の間におけるプレイヤ１０の手首の軌跡のブレ幅或いはバラツキとみなすこともできる。 In step S4, the appropriateness determination unit 33c of the control unit 33 determines the appropriateness of each racket 20 for the player 10 based on the standard deviation value of the Z position of the marker M. Specifically, first, for the first racket 20, the sum of standard deviations at a predetermined time before and after the impact when the racket 20 contacts the shuttle 40 is calculated. For example, when the predetermined time is the time from the sampling time T1 before and after the impact to the sampling time T2, and the standard deviation at the sampling time t between the sampling time T1 and the sampling time T2 is Vf (t), the standard deviation is The total sum Vg can be calculated by the following equation (1).

The total sum Vg of standard deviations calculated in this way is stored in the storage unit 32 as a material for determining the suitability of the first racket 20 for the player 10. And the appropriateness determination part 33c repeats the process similar to the 1st racket 20 also about the 2nd racket 20 or more. Thereby, also for the second and subsequent rackets 20, the total sum Vg of standard deviations as a material for determining suitability for the player 10 is stored in the storage unit 32. The total sum Vg of the standard deviations can also be regarded as the blur width or variation of the wrist trajectory of the player 10 between the sampling times T1 and T2.

  Furthermore, the appropriateness determination unit 33c determines appropriateness for the player 10 by comparing the standard deviation Vg with a predetermined threshold for each racket 20. For example, when the predetermined threshold values are Th1 and Th2 (Th1 <Th2), if the sum Vg of standard deviations is less than the threshold value Th1, the shake of the wrist height position during the smash operation is small, and the wrist of the player 10 is Since almost the same locus is drawn every time, it is determined that the suitability for the player 10 is high. On the other hand, if the sum Vg of standard deviations exceeds the threshold Th2, it is determined that the shake of the wrist height position during the smash operation is large and the suitability for the player 10 is low. When the total standard deviation Vg is not less than the threshold value Th1 and not more than the threshold value Th2, the shake of the wrist height position during the smash operation is moderate, and it is determined that the suitability for the player 10 is also moderate.

  In step S <b> 5, the control unit 33 displays the determination result of the appropriateness determination unit 33 c for each racket 20 on the display unit 35.

  As described above, in the sports hitting tool determination system 1 according to the embodiment of the present invention, a plurality of smash operations of the player 10 are photographed by the motion capture camera 2 for each racket 20 (S1), and the photographed image data is captured. To obtain the Z position of the marker M attached to the wrist of the player 10 (S2). Then, the standard deviation of the Z position of the marker M is calculated at each sampling time (S3), the suitability for the player 10 is determined based on the total Vg of the calculated standard deviation for a predetermined time (S4), and the determination result is displayed on the display unit. 35. For this reason, the player 10 who has seen the determination result can determine the height of the wrist in the smash operation and the magnitude of the blurring of the trajectory for each racket 20, and select a racket 20 suitable for the player 10. Can be useful.

[Modification]
In the above embodiment, the marker M is attached to the wrist of the dominant arm of the player 10 in order to determine the appropriateness of the badminton racket 20, but the position where the marker M is attached is not limited to the wrist, and is the type of sport hitting tool or the analysis target. The marker M may be attached to an appropriate part of the body of the player 10 in consideration of the ease of observation, the ease of blurring, and the like according to the motion. Further, the attachment of the marker M is not limited to the dominant arm, and in sports where the opposite arm also holds the hitting tool, for example, golf or baseball, the marker M may be attached to the opposite arm to the dominant arm.

  In the above embodiment, the standard deviation of the vertical position of the marker M attached to the wrist on the dominant arm of the player 10 is calculated, and the appropriateness of each racket 20 is determined using the sum. The index used for determining appropriateness is not limited to this. For example, the velocity data in the vertical direction may be acquired by performing differentiation on the position data in the vertical direction of the marker M, and the appropriateness of each racket 20 may be determined using the standard deviation of the velocity in the vertical direction.

  In the above-described embodiment, the sport hitting tool determination system 1 is used to determine the suitability of the badminton racket for the player, but the sport hitting tool determination system 1 is also used for hitting tools used for sports other than badminton. be able to. For example, it can be used to determine the suitability of a hitting tool such as a golf club, tennis racket, or bat for a player.

  In the above embodiment, the smash motion of the player 10 with the marker M attached to the wrist of the dominant arm is photographed by the motion capture camera 2, and the Z position of the marker M is acquired by analyzing the photographed image. It is not limited to. For example, the height position of the wrist of the player 10 from the ground may be acquired by attaching an acceleration sensor to the wrist of the dominant arm of the player 10 and performing an integration process or the like on the output from the acceleration sensor during the smash operation. In this case, since it is not necessary to photograph the smash operation, the motion capture camera 2 and step S1 are unnecessary.

  In the above embodiment, the vertical position of the marker M attached to the wrist of the dominant arm of the player 10 is acquired in step S1, and the standard deviation of the vertical position of the marker M is calculated in step S2. It is not limited to. For example, even if the position of the marker M in the direction orthogonal to the moving direction of the shuttle 40 struck by the racket 20 is acquired instead of the position in the vertical direction, the processing after step S2 is executed using this position data. Good. Alternatively, both the position data in the vertical direction of the marker M and the position data in the direction orthogonal to the moving direction of the shuttle 40 may be acquired, and the processes in and after step S2 may be executed on both.

  In the suitability determination method in the above embodiment, the processing is performed for all the plurality of rackets 20 for each step, but step S1 to step S5 may be repeated for each racket 20.

  Next, the verification results of the effectiveness of the above embodiment and its modifications will be described.

<Correlation between appropriateness determination result and player preference>
As in the above embodiment, the correlation between the appropriateness of each racket 20 determined based on the sum of standard deviations and the preference of the player 10 for each racket 20 was verified. Specifically, the marker M is attached to the elbow of the 11 dominant arms of the experiment, and each experiment collaborator uses three badminton rackets A to C that are different in at least one of length, weight, and center of gravity. Each smash operation was performed 5 times, and these smash operations were photographed with a motion capture camera 2 (Flex3 manufactured by OptiTrack). And the standard deviation of the Z position of the marker M was calculated for every sampling time similarly to the said embodiment. The results are shown in FIGS. 4 to 14 show time histories of the average value ± standard deviation of the Z position of the marker M of each experimental collaborator. In each figure, (a), (b), and (c) are rackets A, respectively. When the racket B is used, the racket B is used, and the racket C is used. For each racket, the sum of the standard deviation of the Z position of the marker M from the end of the takeback operation (1.5 seconds in each figure) to the time of impact (2 seconds in each figure) is the same as in the above embodiment. Calculated. The result is shown in FIG. In FIG. 15, the racket having the smallest standard deviation for each experiment collaborator, that is, the sum of the standard deviations of the rackets determined to have the highest suitability for the experiment collaborator among the three rackets. The column is hatched.

  Furthermore, a questionnaire survey was conducted on the feeling of hitting the three rackets A to C during the smash operation with respect to each experimental collaborator. For the question items, 20 items shown in FIG. 16 derived by the evaluation grid method were used. As shown in FIG. 17, the evaluation was performed in seven stages, and the racket B and the racket C were evaluated based on the racket A, respectively. The radar chart shown in FIGS. 18 to 28 is a chart in which the questionnaire survey results are summarized in a chart with the direction leading to good evaluation as 7. In addition, the numerical value shown in the circumference | surroundings in each chart of FIGS. 18-28 means the question item number of FIG. Then, a total of 20 items of evaluation was obtained for the racket B and the racket C. The result is shown in FIG. In this questionnaire survey, since the racket B and the racket C are evaluated with the racket A as a reference, the total evaluation of the racket A is 4 × 20 = 80. Also in FIG. 29, the column of the total value of the evaluations of the rackets having the highest total evaluation is hatched for each experiment cooperator.

  Comparing FIG. 15 with FIG. 29, the racket determined to have the highest suitability and the racket with the highest evaluation based on the questionnaire survey were consistent among all 11 experimental collaborators. That is, it was recognized that the appropriateness of the racket determined by the appropriateness determination method in the above embodiment and the preference of the user who uses the racket have a very high correlation.

<Correlation between proper judgment result and actual play>
Next, as in the above embodiment, the correlation between the appropriateness of each racket 20 determined based on the sum of standard deviations and the effect on actual play was verified. Specifically, using the same rackets A to C as in the above verification, the same 11 people who cooperated with the experiment performed a smashing operation aiming at 18 times for each racket and measured the number of hits. did. The target was set at a height of 1.55m, the same height as the net, in accordance with the badminton rules. FIG. 30 shows the numbers of hits of each experimental collaborator for each racket. As shown in FIG. 30, the experimental collaborator 1, the experimental collaborator 4 and the experimental collaborator 7 hit 18 times regardless of which racket was used, and there was no difference in the number of hits. As for other experiment collaborators, when the racket in the hatched column in FIG. 15, that is, the racket determined to be the most appropriate for the experiment collaborator, the number of hits is the highest. It was confirmed that That is, it was recognized that the appropriateness determined by the appropriateness determination method in the above embodiment and the hit number to the target are highly correlated.

  In addition, using the same rackets A to C as in the above verification, the same experiment collaborators 11 performed a smash operation once for each racket, and the vertical of the marker M attached to the wrist of each experiment collaborator The speed in the direction was calculated. Note that the vertical velocity of the marker M was calculated based on the Z position of the marker M obtained at each sampling time by analyzing the image of the smash operation as in the above embodiment. The results are shown in FIGS. From FIG. 31 to 41, in all the experiment cooperators, after the impact (between 2 seconds and 2.1 seconds), the vertical speed of the marker M differs between the three rackets A to C. It was confirmed that When the racket in the hatched column in FIG. 15, except for the experimental collaborator 3 and the experimental collaborator 8, that is, the racket determined to be most appropriate for the experimental collaborator is used, the marker It was confirmed that the maximum speed in the vertical direction of M was obtained. From this, it is considered that the racket determined to be high by the method for determining appropriateness in the above embodiment has a high swing speed and a sharper smash.

<Marker M mounting position>
Furthermore, what kind of difference occurs in the sum of the standard deviations of the Z position of the marker M between when the marker M is attached to a part of the body of the player 10 and when attached to the racket 20 used by the player 10? Verified. Specifically, three badminton rackets A to C having different lengths, weights, and barycentric positions were prepared, and a smash operation was performed by one collaborator using each racket. For each racket, a smashing operation when the marker M is attached to the wrist of the experiment cooperator and a smashing operation when the marker M is attached near the upper end of the grip of the racket, respectively, in the same manner as in the above embodiment. Images were taken with the motion capture camera 2 (Flex3 manufactured by OptiTrack). And the standard deviation of the Z position of the marker M was calculated for every sampling time similarly to the said embodiment. The results are shown in FIGS. 42 shows the time history of the average value ± standard deviation of the Z position of the marker M when the marker M is attached to the wrist, and FIG. 43 shows the marker when the marker M is attached near the upper end of the grip. The time history of the average value ± standard deviation of the Z position of M is shown. 42 and 43, (a), (b), and (c) respectively show the case where the racket A is used, the case where the racket B is used, and the case where the racket C is used. Furthermore, the sum of standard deviations from the end of the takeback operation (1.5 seconds in each figure of FIGS. 42 and 43) to the time of impact (2 seconds in each figure of FIGS. 42 and 43) is the same as in the above embodiment. Calculated. The result is shown in FIG.

  As shown in FIG. 44, in any racket of racket A to racket C, the standard deviation is greater when the marker M is attached to the wrist than when the marker M is attached near the upper end of the racket grip. The total value of was small. That is, there was little variation in the Z position of the marker M. Further, when the marker M is attached to the wrist, a difference of about 0.7 at maximum is generated as the sum of the standard deviations of the rackets A to C (the racket A and the racket B). In the case of attaching to the rack, only a maximum of about 0.1 is generated as the sum of the standard deviations of the rackets A to C. Therefore, when the marker M is attached to the racket, it is not easy to determine whether the rackets A to C are appropriate. This is considered to be because when the marker M is attached in the vicinity of the upper end of the grip, there is an influence due to the difference in impact at the time of impact due to the strength of grip grip and the difference in grip position, compared to when attached to the wrist. . From this result, it can be said that it is easier to determine the appropriateness of the racket when the marker M is attached to the wrist as in the above embodiment than when the marker M is attached near the upper end of the grip of the racket. Furthermore, a questionnaire survey on the above 20 items was conducted with respect to the above one experiment collaborator, and each question item was evaluated in 7 stages. As a result, racket A, racket C, and racket B were ranked in descending order of evaluation. It was. This order is the order in which the sum of the standard deviations when the marker M is attached to the wrist is small (racket A <racket C <racket B), that is, the order in which it is determined that the suitability for the one experiment collaborator is high. However, the order of the sum of the standard deviations when the marker M was mounted near the upper end of the racket grip (racket C <racket B <racket A) did not match.

<Applicability to golf clubs>
Attach the marker M to the elbows of the three dominant arms, and ask each experimenter to swing five times using three different drivers (golf clubs) A to C. 2 (OptiTrack Flex3). And the standard deviation of the Z position of the marker M was calculated for every sampling time similarly to the said embodiment. The results are shown in FIGS. 45 to 47 show time histories of the average value ± standard deviation of the Z position of the marker M of each experimental collaborator. In each figure, (a), (b), and (c) are the driver A, respectively. , The case where the driver B is used, and the case where the driver C is used are shown. For each driver, the sum of the standard deviation of the Z position of the marker M from the end of the takeback operation (1.6 seconds in each figure) to the impact time (2 seconds in each figure) is calculated as in the above embodiment. Calculated. The results are shown in FIG. Further, the same three experimental collaborators used three different 6-irons (golf clubs) A to C to perform a swing operation similar to that of the drivers A to C, and the standard deviation of the Z position of the marker M Was calculated. The results are shown in FIGS. Further, the total sum of standard deviations at the Z position of the marker M was calculated. The result is shown in FIG. In FIGS. 48 and 52, the golf club having the smallest standard deviation for each experimental collaborator, that is, the sum of standard deviations of the golf clubs judged to have the highest suitability for the experimental collaborator is displayed. Has been hatched. Then, the same questionnaire survey as in the case of the above badminton racket was conducted for each experimental collaborator, and each golf club was evaluated. It was confirmed that it was consistent with the highest golf club. That is, also in the golf club, it was recognized that the correlation between the suitability determined by the suitability determination method in the above embodiment and the user's preference is very high.

<Applicability to tennis rackets>
Attach the marker M to the wrist of the three dominant arms of the experiment collaborators, and ask each experiment collaborator to perform five strokes each using two different tennis rackets C and D, and the motion capture camera 2 (OptiTrack) Taken with a Flex 3). And the standard deviation of the Z position of the marker M was calculated for every sampling time similarly to the said embodiment. The results are shown in FIGS. 53 to 55 show time histories of the mean value ± standard deviation of the Z position of the marker M of each experimental collaborator. In each figure, (a) and (b) use a tennis racket C, respectively. The case where the tennis racket D is used is shown. And about each tennis racket, the sum total of the standard deviation of the Z position of the marker M in 0.2 second (from 0.4 second to 0.6 second of each figure) before and after impact was calculated. As a result, as shown in FIG. 56, the sum of the standard deviations of the tennis racket C was smaller than the tennis racket D in any of the experimental collaborators. A questionnaire survey similar to the case of the above badminton racket was conducted for each experiment collaborator, and the tennis racket C and the tennis racket D were evaluated. Was confirmed to be higher than the tennis racket D. In other words, it was confirmed that the tennis racket judged to be highly appropriate matches the tennis racket evaluated highly by the questionnaire survey. From this, also in the tennis racket, it was recognized that the appropriateness determined by the appropriateness determination method in the above embodiment and the user's preference have a very high correlation.

  DESCRIPTION OF SYMBOLS 1 Sport hitting suitability determination system, 2 Motion capture camera, 3 Suitability determination device, 10 Player, 20 Rackets, 31 Interface, 32 Storage part, 33 Control part, 33a Position acquisition part, 33b Standard deviation calculation part, 33c Suitability determination part , 34 input section, 35 display section, 36 bus, 40 shuttle, M marker

Claims (10)

A sports hitting determination system for determining a sports hitting tool suitable for a user who uses a sports hitting tool,
For a plurality of sports hitting tools, the user who put a marker on a part of the body observes the action of hitting the object multiple times, and for each action, a position acquisition unit that acquires the position of the marker;
For each sport hitting tool, a standard deviation calculating unit for calculating a standard deviation of the position of the acquired marker,
For each sport hitting tool, calculate the sum of the standard deviations at a predetermined time before and after the sport hitting tool contacts the object, and based on the sum of the standard deviations, determine the appropriateness of each sport hitting tool for the user. A sports hitting tool determination system including an appropriate determination unit for determining. When the predetermined time is a time from time T1 to time T2 before and after the sport hitting tool contacts the object, and the standard deviation at time t between time T1 and time T2 is Vf (t), The sports hitting tool determination system according to claim 1, wherein Vg, which is a sum of the standard deviations, is obtained by the following equation (1).

  3. The position acquisition unit according to claim 1, wherein the position acquisition unit acquires a position of the marker in a vertical direction from the ground and / or a position in a direction orthogonal to a moving direction of an object hit by a sports hitting tool. Sports hitting judgment system.   The sports hitting determination system according to any one of claims 1 to 3, wherein the marker is attached to a wrist or an elbow of the user's dominant arm.   The sports hitting determination system according to any one of claims 1 to 4, wherein the sports hitting tool is a badminton racket, a golf club, or a tennis racket. A sports hitting determination method for determining a sports hitting tool suitable for a user who uses a sports hitting tool,
For a plurality of sports hitting tools, the user who put a marker on a part of the body observes the motion of hitting the object multiple times, and for each motion, acquiring the position of the marker;
For each sport hitting tool, calculating a standard deviation of the acquired marker position;
For each sport hitting tool, calculate the sum of the standard deviations at a predetermined time before and after the sport hitting tool contacts the object, and based on the sum of the standard deviations, determine the appropriateness of each sport hitting tool for the user. And determining a sports hitting tool. When the predetermined time is a time from time T1 to time T2 before and after the sport hitting tool contacts the object, and the standard deviation at time t between time T1 and time T2 is Vf (t), The sports hitting determination method according to claim 6, wherein Vg, which is a sum of the standard deviations, is obtained by the following equation (2).

  The sport hitting tool determination method according to claim 6 or 7, wherein the position of the marker is a position in a vertical direction from the ground and / or a position in a direction orthogonal to a moving direction of an object hit by the sport hitting tool. . The sports hitting tool determination method according to any one of claims 6 to 8, wherein the marker is attached to a wrist or an elbow of a dominant arm of the user. The sports hitting determination method according to claim 6, wherein the sports hitting tool is a badminton racket, a golf club, or a tennis racket.

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