JPWO2018030424A1 - Measuring system, measuring device, measuring method and control program - Google Patents

Abstract

  The measurement system for measuring the movement of the subject relative to the object is attached to the subject or the object of the subject, and the first movement information regarding the movement of the opponent when the object is released from the opponent toward the subject. First detection means that can be detected, second detection means that is attached to the waist of the subject and that can detect second movement information relating to the movement of the waist of the subject relative to the object, first movement information, and second Processing means for calculating an evaluation parameter of the subject's movement based on the movement information and output means for outputting the evaluation parameter obtained by the processing means.

Description

  The present disclosure relates to a technique for measuring a movement of a subject.

  In sports performed using a ball hitting tool such as a baseball bat or a tennis racket, the ability to see the object (ball) released from the opponent and swing the ball hitting tool is important for advancing games and the like. It is an indicator. Therefore, various methods for evaluating the swing by the hitting tool have been proposed.

  For example, Japanese Patent Laying-Open No. 2015-185852 (Patent Document 1) discloses a batting analysis support system that supports batter batting analysis. This system supports the analysis of the batter's batting using a pitcher-batter fighting video shot from different first to n-th directions in a game such as baseball.

Japanese Patent Laying-Open No. 2015-185852

  In patent document 1, it is said that the batter's batting can be quickly analyzed using a battle video between the pitcher and the batter. However, in the configuration in which the analysis is performed using the video, the frame rate is not sufficient and the analysis accuracy is low in the video captured by a normal camera. Also, a high-speed camera with a sufficient frame rate is too large to measure easily. Furthermore, it is necessary to analyze the video after shooting the batting, which is in real time.

  The present invention has been made to solve the above-described problems, and is a measurement system, a measurement device, a measurement method, and a measurement system that can easily notify a subject of movement characteristics of the subject with respect to an object. An object is to provide a control program.

  According to an embodiment, a measurement system for measuring a subject's movement relative to an object is provided. The measurement system is attached to the partner of the subject or the target, and a first detection unit capable of detecting first motion information related to the motion of the partner when the target is released from the partner toward the subject; Based on the second detection means attached to the subject's waist and capable of detecting second motion information relating to the subject's waist movement relative to the object, the first motion information and the second motion information, Processing means for calculating the motion evaluation parameter and output means for outputting the evaluation parameter obtained by the processing means are provided.

  Preferably, the processing means calculates a first timing at which the object is released based on the first movement information, and the waist of the subject starts with respect to the object based on the second movement information. A second timing is calculated, and a time difference between the first timing and the second timing is calculated as an evaluation parameter.

  Preferably, the first movement information includes acceleration in a direction in which the object is released. The second movement information includes an angular velocity around the body axis of the subject. The first timing is the time when the absolute value of the acceleration reaches the first threshold value. The second timing is the time when the absolute value of the angular velocity reaches the second threshold value.

  According to another embodiment, a measurement system for measuring a movement of a subject relative to an object during a swing is provided. The measurement system is attached to a partner or an object of the subject, and a first detection means capable of detecting first movement information regarding the movement of the partner when the object is released from the partner toward the subject, and the subject A second detection means that is attached to a grip end of a ball hitting tool used by the subject's back part or the subject, and capable of detecting second movement information relating to the movement of the back when the subject swings with respect to the object; Based on the motion information and the second motion information, processing means for obtaining a swing evaluation parameter by the subject and output means for outputting the evaluation parameter obtained by the processing means are provided.

  Preferably, the processing means calculates a first timing at which the object is released based on the first movement information, and when the subject swings based on the second movement information, the back part of the subject Is calculated, and a time difference between the first timing and the second timing is calculated as an evaluation parameter.

  Preferably, the first motion information includes an acceleration in a direction in which the object is fired or a direction in which the object is thrown. The second motion information includes acceleration in at least one of the three axial directions in the subject. The first timing is the time when the absolute value of the acceleration reaches the first threshold value. The second timing is the time when the absolute value of the combined acceleration in at least one axial direction reaches the second threshold value.

  According to yet another embodiment, a measurement system for measuring a subject's movement relative to an object is provided. A first detection means that is attached to the partner or object of the subject and capable of detecting first movement information relating to the movement of the partner when the object is released from the partner toward the subject; A second detection means attached to the predetermined part and capable of detecting second movement information relating to the movement of the predetermined part of the subject relative to the object; and a third detection part attached to the waist of the subject and related to the movement of the subject's waist relative to the object. Processing means for obtaining a plurality of evaluation parameters of the swing by the subject based on the third detection means capable of detecting the movement information of the first movement information, the first movement information, the second movement information, and the third movement information And an output means for outputting a plurality of evaluation parameters obtained by the processing means.

  Preferably, the processing means calculates a first timing at which the object is released based on the first movement information, and a predetermined part of the subject is started with respect to the object based on the second movement information. Second timing is calculated, and based on the third movement information, a third timing at which the subject's waist is started with respect to the object is calculated. As the first evaluation parameter, the first timing and the second timing are calculated. A first time difference from the second timing is calculated, and a second time difference between the first timing and the third timing is calculated as a second evaluation parameter.

  Preferably, the first movement information includes acceleration in a direction in which the object is released. The second motion information includes acceleration in at least one of the three axial directions of the predetermined part of the subject. The third movement information includes an angular velocity around the body axis of the subject. The first timing is the time when the absolute value of the acceleration reaches the first threshold value. The second timing is the time when the absolute value of the combined acceleration in at least one axial direction reaches the second threshold value. The third timing is the time when the absolute value of the angular velocity reaches the third threshold value.

  Preferably, the processing means evaluates the motion level of the subject based on an evaluation parameter acquired from the subject and a predetermined rule. The output means further outputs the operation level.

  According to yet another embodiment, a measuring device is provided that is attached to the waist of a subject and measures the movement of the subject relative to the object. The measuring device relates to a first input means for receiving input of first movement information related to a movement of the opponent when the object is released from the opponent side of the subject toward the subject, and a movement of the waist of the subject relative to the object. Based on the detection means capable of detecting the second motion information, the first motion information, and the second motion information, the processing means for obtaining the evaluation parameter of the swing by the subject, the evaluation parameter obtained by the processing means Output means for outputting.

  According to yet another embodiment, a measuring device is provided that is attached to the waist of a subject and measures the movement of the subject relative to the object. A first input means for receiving input of first movement information relating to the movement of the other party when the object is released from the other party of the subject toward the subject, and a second movement relating to the movement of the waist of the subject relative to the object Detection means capable of detecting information, second input means for accepting input of third movement information relating to movement of a predetermined part other than the waist of the subject relative to the object, first movement information, and second movement information And processing means for obtaining a plurality of evaluation parameters of the subject's movement based on the third movement information, and output means for outputting the evaluation parameters obtained by the processing means.

  According to yet another embodiment, a measurement method for measuring a subject's movement relative to an object is provided. A step of detecting first movement information relating to the movement of the subject when the object is released from the opponent side of the subject toward the subject, and a step of detecting second movement information relating to the movement of the waist of the subject relative to the object. And a step of obtaining an evaluation parameter of the subject's movement based on the first movement information and the second movement information, and a step of outputting the evaluation parameter.

  According to yet another embodiment, a control program is provided that is attached to the waist of a subject and executed by a computer of a measuring device for measuring the subject's movement relative to the object. The control program receives the input of the first movement information relating to the movement of the opponent when the object is released from the opponent side of the subject toward the subject, and the control program includes a step relating to the movement of the waist of the subject relative to the object. Detecting the motion information of the subject, determining the motion evaluation parameter of the subject based on the first motion information and the second motion information, and outputting the evaluation parameter.

  In one aspect, it is possible to easily notify the subject of the characteristics of the subject's movement with respect to the object.

It is a figure which shows the whole structure of the measurement system according to Embodiment 1. FIG. It is a figure for demonstrating the relative coordinate system set on the right back of a batter. 5 is a flowchart for illustrating an outline of operation of the measurement system according to the first embodiment. FIG. 3 is a block diagram showing a hardware configuration of a terminal device according to the first embodiment. 3 is a block diagram showing a hardware configuration of each sensor device according to the first embodiment. FIG. It is a figure for demonstrating the calculation method of the evaluation parameter calculated from several motion information. It is a figure which shows the tendency of the time difference with an expert and an unskilled person. 3 is a flowchart showing a processing procedure of the sensor device according to the first embodiment. 6 is a flowchart showing a processing procedure of the terminal device according to the first embodiment. It is a figure which shows the whole structure of the measurement system according to Embodiment 2. FIG. It is a figure which shows the hardware constitutions of the terminal device according to Embodiment 2. 6 is a flowchart showing a processing procedure of a terminal device according to the second embodiment. It is a figure which shows the time change of the acceleration acquired by the sensor apparatus incorporated in the ball | bowl. It is a figure which shows an example of the tendency of the time difference of an expert and an unskilled person. It is a figure which shows the other example of the tendency of the time difference of an expert and an unskilled person.

  Hereinafter, the present embodiment will be described. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated.

  Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified.

[Embodiment 1]
<Overall system configuration>
With reference to FIG. 1 and FIG. 2, the overall configuration of the measurement system according to the first embodiment will be described. FIG. 1 is a diagram showing an overall configuration of a measurement system 1 according to the first embodiment. FIG. 2 is a diagram for explaining a relative coordinate system set on the right back of the batter. Specifically, FIG. 2A is a diagram illustrating a relative coordinate system when viewed from the right back side of the batter. FIG. 2B is a diagram illustrating a relative coordinate system when viewed from the side of the right back of the batter. In the specification of the present application, the “back” part is the back part of the hand including the wrist including the radius and the ulna to the base of the fifth finger.

  With reference to FIG. 1, the measurement system 1 for measuring a subject's movement at the time of a swing was attached to the terminal device 10, the sensor device 20 attached to the pitching machine 22, and the back of the subject (batter). It includes a sensor device 30 and a sensor device 40 attached to the waist of the batter. In Embodiment 1, it is assumed that the subject is a left-handed batter. Further, it is assumed that an object (ball) is released (fired) toward the batter from the pitching machine 22 side and the batter swings the hitting tool (here, the bat) against the ball.

  In Embodiment 1, the case where the terminal device 10 is a smartphone will be described. However, the terminal device 10 can be realized as an arbitrary device regardless of the type. For example, the terminal device 10 may be a tablet terminal, a PDA (Personal Digital Assistance), a notebook PC (personal computer), a desktop PC, or the like.

  The terminal device 10 is configured to be capable of wireless communication with the sensor devices 20, 30, and 40. For example, the terminal device 10 communicates with the sensor devices 20, 30, and 40 using Bluetooth (registered trademark), a wireless local area network (LAN), infrared communication, and the like. The terminal device 10 may be configured to be capable of wired communication using a USB (Universal Serial Bus) or the like.

  The terminal device 10 receives the motion information of the pitching machine 22 transmitted from the sensor device 20, and receives the motion information of the batter transmitted from each of the sensor device 30 and the sensor device 40. The terminal device 10 executes a predetermined process based on the movement information and displays the processing result on the display.

  The sensor device 20 includes an acceleration sensor that can measure accelerations in directions of three axes orthogonal to each other (a-axis, b-axis, and c-axis in FIG. 1). The sensor device 20 may include an angular velocity sensor that can measure angular velocities about three axes orthogonal to each other (a-axis, b-axis, and c-axis in FIG. 1).

  The sensor device 30 includes an angular velocity sensor capable of measuring angular velocities around three axes orthogonal to each other (X axis, Y axis, and Z axis in FIG. 2) and three axes orthogonal to each other (X axis, Y axis, and Z axis in FIG. 2). And an acceleration sensor capable of measuring acceleration in the (axis) direction.

  The sensor device 40 includes an angular velocity sensor capable of measuring angular velocities around three axes orthogonal to each other (X axis, Y axis, and Z axis in FIG. 1) and three axes orthogonal to each other (X axis, Y axis, and Z axis in FIG. 1). And an acceleration sensor capable of measuring acceleration in the (axis) direction.

  Referring to FIG. 1, the sensor device 20 is configured such that one of the three axes (a-axis, b-axis, and c-axis in FIG. 1) of the acceleration sensor faces the ball firing direction (a-axis in FIG. 1). In addition, it is attached to the pitching machine 22 via an attachment member (not shown). The b axis is set as an axis extending in a direction parallel to the ground, and the c axis is set as an axis extending in a direction perpendicular to the a axis and the b axis.

  The attachment member is configured to fix the sensor device 20 to the pitching machine 22 along a predetermined direction. The sensor device 20 attached to the pitching machine 22 is configured to be able to acquire movement information regarding the movement of the pitching machine 22 when the ball is released (launched). Specifically, the movement information includes accelerations in the directions of the three axes (a-axis, b-axis, and c-axis in FIG. 1) at the attachment location of the pitching machine 22.

  The sensor device 40 has a waist attachment member (illustrated) so that one of the three axes in the angular velocity sensor and the acceleration sensor faces the body axis direction of the batter (X axis in FIG. 1: an axis extending from the waist to the head). Not attached) to the batter's waist. The Y axis is set as an axis extending in the batter's swing direction, and the Z axis is set as an axis extending in the direction perpendicular to the X axis and the Y axis. Here, the swing direction is a direction in which the ball is launched (hit ball direction).

  The waist attachment member is configured to be able to fix the sensor device 40 to the waist of the batter along a predetermined direction. The sensor device 40 attached to the waist of the batter is configured to be able to acquire movement information regarding the movement of the waist during the swing of the batter. Specifically, this motion information includes angular velocities and accelerations in the three-axis directions around the three axes (X-axis, Y-axis, and Z-axis in FIG. 1) at the waist.

  Referring to FIG. 2, the sensor device 30 is configured so that one of the three axes in the angular velocity sensor and the acceleration sensor is directed to an axis extending from the center of the batter's palm toward the middle finger (the X axis in FIG. 2). It is attached to the back of the batter via an attachment member (not shown). The Y axis is set as an axis extending in the width direction of the batter's palm orthogonal to the Z axis, and the Z axis is set as an axis extending in the direction orthogonal to the back (axis extending from the palm to the back).

  The back mounting member is configured to fix the sensor device 30 to the back of the batter along a predetermined direction. The sensor device 30 attached to the back of the batter is configured to be able to acquire movement information related to the movement of the back during the swing of the batter. Specifically, the movement information includes angular velocities and accelerations in the three-axis directions around the three axes on the back (X-axis, Y-axis, and Z-axis in FIG. 2).

  Regardless of whether the right-handed batter or the left-handed batter is used, the measurement may be performed with the sensor device 30 attached to either the right back or the left back.

  Here, it is assumed that the sensor devices 20, 30, and 40 are in a time synchronized state with each other. For example, the terminal device 10 generates a synchronization signal for time synchronization and transmits the synchronization signal to each of the sensor devices 20, 30, and 40. Thereby, the time data linked | related with each sensor data acquired in each sensor apparatus 20,30,40 are synchronized. In addition, the structure which implement | achieves the time synchronization in the sensor apparatuses 20, 30, and 40 using another well-known method may be sufficient.

<Overview of system operation>
FIG. 3 is a flowchart for illustrating an operation outline of measurement system 1 according to the first embodiment.

  With reference to FIG. 3, in measurement system 1 according to the first embodiment, first, sensor device 20 has information on movement of pitching machine 22 when a ball is launched from the pitching machine 22 side toward a subject (batter). Acceleration data at the mounting position) is detected (acquired) (step S100).

  Next, when the batter swings the bat against the ball fired from the pitching machine 22, the sensor device 30 acquires movement information (acceleration data) on the batter's back (step S110). Further, the sensor device 40 acquires movement information (angular velocity data) on the batter's waist (step S120). The bat may be any bat such as one prepared by the batter itself or one prepared by another person.

  Next, each of the sensor devices 20, 30, and 40 transmits the acquired motion information to the terminal device 10 (step S130).

  Next, the terminal device 10 receives the motion information transmitted from each of the sensor devices 20, 30, and 40, and calculates at least one evaluation parameter for evaluating the batter's swing based on each motion information. (Step S140).

  And the terminal device 10 outputs the calculated at least 1 evaluation parameter (step S150). Specifically, the terminal device 10 displays the evaluation parameter on a display. The terminal device 10 may evaluate the batter's swing level based on the evaluation parameter and a predetermined rule, and may display the swing level together with the evaluation parameter on the display. For example, the predetermined rule is a swing evaluation level created for each evaluation parameter according to the value of the evaluation parameter.

<Hardware configuration>
(Terminal device 10)
FIG. 4 is a block diagram showing a hardware configuration of terminal apparatus 10 according to the first embodiment. Referring to FIG. 4, terminal device 10 includes, as main components, CPU (Central Processing Unit) 102, memory 104, touch panel 106, button 108, display 110, wireless communication unit 112, and communication antenna. 113, a memory interface (I / F) 114, a speaker 116, a microphone 118, and a communication interface (I / F) 120.

  The CPU 102 controls the operation of each unit of the terminal device 10 by reading and executing the program stored in the memory 104. More specifically, the CPU 102 implements each process (step) of the terminal device 10 to be described later by executing the program.

  The memory 104 is realized by a RAM (Random Access Memory), a ROM (Read-Only Memory), a flash memory, or the like. The memory 104 stores a program executed by the CPU 102 or data used by the CPU 102.

  The touch panel 106 is provided on the display 110 having a function as a display unit, and may be any type such as a resistance film method and a capacitance method.

  The button 108 is disposed on the surface of the terminal device 10, receives an instruction from the user, and inputs the instruction to the CPU 102.

  The wireless communication unit 112 is connected to the mobile communication network via the communication antenna 113 and transmits and receives signals for wireless communication. Thereby, the terminal device 10 can communicate with a predetermined communication device via a mobile communication network such as LTE (Long Term Evolution), for example.

  A memory interface (I / F) 114 reads data from an external storage medium 115. The CPU 102 reads out data stored in the external storage medium 115 via the memory interface 114 and stores the data in the memory 104. The CPU 102 reads data from the memory 104 and stores the data in an external storage medium 115 via the memory interface 114.

  The storage medium 115 includes a CD (Compact Disc), a DVD (Digital Versatile Disk), a BD (Blu-ray (registered trademark) Disc), a USB (Universal Serial Bus) memory, a memory card, an FD (Flexible Disk), A medium for storing the program in a nonvolatile manner, such as a hard disk.

  The speaker 116 outputs sound based on a command from the CPU 102. The microphone 118 receives an utterance from the terminal device 10.

  The communication interface (I / F) 120 is, for example, a communication interface for transmitting / receiving data to / from the sensor devices 20, 30, 40, and is realized by an adapter, a connector, or the like. The communication method is, for example, Bluetooth (registered trademark), wireless communication using a wireless LAN, or wired communication using USB.

(Sensor device 20, 30, 40)
FIG. 5 is a block diagram showing a hardware configuration of sensor devices 20, 30, and 40 according to the first embodiment. Referring to FIG. 5, sensor devices 20, 30, and 40 include, as main components, CPU 202 for executing various processes, a memory 204 for storing programs executed by CPU 202, motion information, and the like. An acceleration sensor 206 capable of measuring acceleration in three axes, an angular velocity sensor 208 capable of measuring angular velocities around each of the three axes, a communication interface (I / F) 210 for communicating with the terminal device 10, and a sensor And a storage battery 212 that supplies power to the various components of the devices 20, 30, 40.

<Evaluation parameter calculation method>
Next, an evaluation parameter calculation method according to the present embodiment will be described.

  The batter needs to swing by looking at the pitch, pitch and course thrown by the pitcher. In general, the time it takes for the ball thrown (released) from the pitcher to reach the batter's hitting position depends on the speed and the type of ball, but it is about 0.4 to 0.6 seconds. About short. Therefore, if the batter's swing start timing is slightly deviated, a swing delay or the like will occur and it will not be possible to hit well. Therefore, in evaluating the batter's swing, the start timing is an extremely important index.

  An evaluation parameter calculation method that has been found to be important when evaluating the batter's swing as a result of the present inventors paying careful attention to the above start timing will be described.

  FIG. 6 is a diagram for explaining an evaluation parameter calculation method calculated from a plurality of pieces of motion information. Specifically, FIG. 6A is a diagram illustrating temporal changes in a plurality of pieces of motion information when the subject is a baseball expert. FIG. 6B is a diagram showing temporal changes of a plurality of pieces of motion information when the subject is an unskilled baseball player. 6A and 6B, the horizontal axis indicates time (ms), the vertical axis (left side) indicates acceleration (G), and the vertical axis (right side) indicates angular velocity (deg / s). Yes. Note that batters with baseball experience of 3 years or more are selected as “experts”, and batters of less than 3 years are selected as “unskilled persons”.

  Graphs 61A and 61B (solid lines) in FIGS. 6A and 6B indicate accelerations in the ball firing direction (a-axis direction in FIG. 1) in the pitching machine 22. The original data of the graphs 61A and 61B are acquired by the sensor device 20.

  Graphs 62A and 62B (one-dot chain lines) indicate the combined accelerations in the three-axis directions in the backs of skilled and unskilled workers, respectively. The original data of the graphs 62A and 62B is acquired by the sensor device 30.

  Graphs 63A and 63B (dotted lines) indicate angular velocities around the body axis (X axis in FIG. 1) in the waist of the skilled and unskilled persons, respectively. The original data of the graphs 63A and 63B is acquired by the sensor device 40.

  The terminal device 10 calculates the timing (launch timing) at which the ball is fired based on the motion information acquired by the sensor device 20. Based on the movement information acquired by the sensor device 30, the terminal device 10 calculates the timing (back portion start timing) at which the back portion of the batter starts when the batter swings. Based on the movement information acquired by the sensor device 40, the terminal device 10 calculates the timing at which the waist of the batter starts when the batter swings (waist start timing).

  Then, the terminal device 10 calculates a time difference between the launch timing and the back portion start timing as the evaluation parameter P1, and calculates a time difference between the launch timing and the waist start timing as the evaluation parameter P2.

Specifically, the firing timing, the threshold Th1 absolute value of the acceleration of the firing direction of the ball which is measured by the sensor device 20 (e.g., 10G) is the time T ₁ has been reached. Hand-back part start timing, the absolute value of the threshold Th2 synthetic acceleration in hand-back portion which is measured by the sensor device 30 (e.g., 8G) is time T _2, which has reached the. Therefore, the evaluation parameter P1 is a time difference _{T 12} between the time _{T 1} and time _{T 2.}

Further, lumbar start timing, the absolute value of the angular velocity around the body axis of the lumbar measured by the sensor unit 40 is the threshold value Th3 (e.g., 230deg / s) is the time _{T 3} has been reached. Therefore, the evaluation parameter P2 is a time difference _{T 13} between the time _{T 1} and time _{T 3.}

More specifically, the time T ₁ is a firing timing shows the moment of time when the ball toward from the pitching machine 22 to the batter is fired (release). At the moment when the ball is fired from the pitching machine 22, a large amount of momentum is lost, so that a reaction acts and the acceleration in the firing direction changes abruptly. For this reason, the time T ₁ at which the acceleration is abruptly changed and exceeds the threshold value (the absolute value of the acceleration has reached the threshold value Th1) can be regarded as the time when the ball is launched.

  The threshold value Th1 is set to a value that can be regarded as a steep change in acceleration accompanying the ball firing, and is set to 10G, for example. In addition, the setting method of threshold value Th1 may be set by actually measuring the acceleration obtained when the pitching machine 22 launches the ball, or may be set by simulation or the like.

Time T _2, a hand-back part start timing, relative to the ball that is launched toward the batter from pitching machine 22 shows the starting time of the hand-back portion when the subject swings. When the batter starts swinging, a large acceleration is generated in the back part along with the swing motion. Therefore, the time T ₂ at which the combined acceleration in the three-axis direction (hereinafter, also simply referred to as “three-axis combined acceleration”) is abruptly changed to a threshold value or more (the absolute value of the acceleration has reached the threshold value Th2) is The swing start time when attention is paid to the back of the batter can be considered. It should be noted that the use of the three-axis composite acceleration is practical because it is not necessary to consider the displacement of the mounting direction of the acceleration sensor or the mounting direction during use.

  The threshold value Th2 is set to a value that can be regarded as an abrupt change in acceleration due to the swing motion of the batter, and is set to 8G, for example. Note that the threshold Th2 may be set in advance by actually measuring the acceleration of the back obtained at the start of the batter's swing, or may be set in advance by simulation or the like.

Time T ₃ is a waist starting timing, relative to the ball that is launched toward the batter from pitching machine 22, batter indicates the starting time of the waist at the time of swing. Specifically, when the batter starts swinging, a large angular velocity is generated due to the rotational motion around the body axis at the waist. Therefore, angular velocity about the body axis is equal to or higher than are abruptly changes the threshold (absolute value of the angular velocity reaches the threshold value Th3) time T ₃ shall be regarded as the swing start time when attention is directed to batter the waist Can do.

  The threshold value Th3 is set to a value that can be regarded as a steep change in angular velocity due to the swing motion of the batter, and is set to, for example, 230 deg / s. The threshold value Th3 may be set in advance by actually measuring the angular velocity of the waist that occurs at the start of the batter's swing, or may be set in advance by simulation or the like.

In the case of the expert shown in FIG. 6A, the time difference T ₁₂ (= T ₂ −T ₁ ), which is the reaction time from when the ball is fired until the batter's back is started, is 308 ms. It is considered that hand-back part of the batter is able to react quickly with respect fired ball shorter time difference T _12, it is estimated that the swing level is high. This can be seen from the fact that the time difference T ₁₂ = 308 ms (see FIG. 6A) for the skilled person is shorter than the time difference T ₁₂ = 378 ms for the unskilled person (see FIG. 6B).

In the case of the expert shown in FIG. 6A, the time difference T ₁₃ (= T ₃ −T ₁ ), which is the reaction time from when the ball is fired until the batter's waist starts, is 278 ms. It is considered that the batter of the waist is able to react quickly to a fired ball shorter time difference T _13, it is estimated that the swing level is high. This can be understood from the fact that the time difference T ₁₃ = 278 ms (see FIG. 6A) for the skilled person is shorter than the time difference T ₁₃ = 293 ms for the unskilled person (see FIG. 6B).

Here, by swinging the bat to a plurality of skilled and unskilled, illustrating the results of measuring the time difference T ₁₂ and the time difference T _13.

Table 1 shows time difference data for a plurality of skilled and unskilled persons. In Table 1, no. 1-No. 8 experts up to 8 and no. 9-No. By swinging the unskilled of six to 14, as a result of the time difference T ₁₂ and the time difference T ₁₃ of each measured is shown. The measurement results of the time difference T _12, T ₁₃ in the batter shown in Table 1 is the average of four times the time difference T _12, T _13, which is measured when each batter swings 4 times.

Referring to Table 1, it skill than unskilled, it can be seen that the time difference T ₁₂ and the time difference T ₁₃ is tends to be short. Then, the calculation result of the average value and standard deviation about each of the expert and the unskilled person calculated based on Table 1 is shown in Table 2. Specifically, the average value and standard deviation of the time differences T ₁₂ and T ₁₃ for the skilled worker are calculated based on the time differences of the eight skilled workers. Further, the average value and standard deviation of the time differences T ₁₂ and T ₁₃ for the unskilled person are calculated based on the time differences of the six skilled persons.

FIG. 7 is a diagram showing the tendency of the time difference between the skilled person and the unskilled person. Specifically, the contents of FIG. 7 correspond to the contents of Table 2 shown as a graph. Referring to Table 2 and FIG. 7, it is than unskilled skill, 41.6Ms short, it can be seen that 41.8ms short in average time difference _{T 13} at an average time difference _{T 12.} Further, the time differences T ₁₂ and T ₁₃ were significantly different between skilled and unskilled workers at a statistical 5% significance level. From this, it can be said that the expert has started significantly in both the back part and the waist part in a short time. Therefore, the time difference T ₁₂ and the time difference T ₁₃ can be used as a parameter for evaluating the swing (skill).

<Distinction method>
Here, a method for discriminating skilled and unskilled persons will be described. In the following description, 8 skilled persons shown in Table 1 are referred to as “experts group”, and 6 unskilled persons are referred to as “unskilled persons group”. Based on the data shown in Table 1, the test for equivariance of the variance-covariance matrix of the skilled group and the unskilled group was performed, and P = 0.607 was obtained. Here, when the risk rate is 5%, it becomes significant when the P value is smaller than 0.05, so the test is not significant, and the expert group and the unskilled group are equally distributed. . Therefore, based on the data shown in Table 1, a linear discriminant function like the following formula (1) is obtained.

Z = -0.03033 × T ₁₂ −0.06925 × T ₁₃ +29.95099 (1)
Here, using Equation (1), when Z ≧ 0, it can be determined as “expert group”, and when Z <0, it can be determined as “unskilled group”.

Incidentally, discrimination rate Pe erroneous With Mahalanobis squared distance D ² may be expressed as the following equation (2). φ indicates the lower probability of the standard normal distribution.

Pe = φ (-D / 2) (2)
Here, when the data of Table 1 is used, Mahalanobis's square distance D ² = 4.1562 is calculated. Therefore, using this value and Equation (2), Pe = 0.1540 is calculated. Thereby, the positive discrimination rate of the discrimination result when using the formula (1) is estimated to be 84.60%.

  Here, while calculating Z obtained from the discriminant function of Equation (1) and verifying whether this discriminant function is valid, the results shown in Table 3 were obtained.

  According to Table 3, since the correct discrimination rate for the expert group is 75% and the correct discrimination rate for the unskilled worker group is 83.3%, the overall correct discrimination rate is 78.6%. . Generally, in the discriminant analysis, when the correct discrimination rate exceeds 75%, the discriminant function is considered valid. Therefore, it can be determined that the discriminant function is valid. That is, it can be said that whether or not the value of Z is positive is an effective index for identifying whether the person is an expert or an unskilled person. The positive discrimination rate (78.6%) is relatively close to the positive discrimination rate (84.6%) estimated when Mahalanobis square distance is used.

Next, as another determination method, the method for determining using the time difference T ₁₂ and the time difference T ₁₃ alone will be described. Specifically, this is a method of determining an average value of time differences between skilled and unskilled persons as a threshold value.

In particular, the threshold value U1 in the case of using the time difference _{T 12} becomes 346.0 (= (325.2 + 366.8) / 2). That is, when T ₁₂ <U1 is established, it is determined as an expert, and when T ₁₂ ≧ U1 is established, it is determined as an unskilled person. The threshold U2 of the case of using the time difference _{T 13} becomes 281.0 (= (260.1 + 301.9) / 2). That is, when T ₁₃ <U2 is satisfied, it is determined as an expert, and when T ₁₃ ≧ U2, it is determined as an unskilled person. When the validity of this discrimination method was verified, the results shown in Table 4 were obtained.

According to Table 4, in the case of using the time difference T ₁₂ is a positive discrimination rate of 75% for those skilled group, since the positive discrimination rate for unskilled group is 66.6%, total The correct discrimination rate is 71.4%. When using the time difference T ₁₃ is a 75% positive discrimination rate for skilled group, since the positive discrimination rate for unskilled group is 83.3%, total positive discrimination rate is 84 .6%. Thus, it can be seen that better discrimination method using the time difference T ₁₃ good positive discrimination rate.

Although the positive discrimination rate is higher when the reaction time (time difference T ₁₃ ) at the waist is confirmed, a relatively high positive discrimination rate is also obtained by the discrimination method at the back. Moreover, since evaluation at the back part is excellent in simplicity, it can be said that it is effective from the viewpoint of simple measurement.

  In addition, No. In 11 subjects (batters), the discrimination result in the back part is erroneously discriminated, but the discrimination result in the waist part is correct. This is probably because the reaction time of the back part is early, but the reaction time of the lower back part is delayed because the subject's swing is made manually.

A rule for determining the proficiency (swing level) of the subject's swing may be created using the above-described determination method. Specifically, when using the discriminant function, the measured time differences T ₁₂ and T ₁₃ are substituted into the equation (1), and when Z ≧ 0, the subject is determined to be “expert” and Z In the case of <0, a rule for determining the subject as “unskilled” can be considered.

In the case of using the average value of the time difference T _12, measures the time difference T ₁₂ subjects, to determine the subject when the T _{12 <U1} is established as "skill", if the T ₁₂ ≧ U1 is established Can be considered as a rule for judging as unskilled. Similarly, in the case of using the average value of the time difference T ₁₃ measures a time difference T ₁₃ subjects, the subjects if T _{13 <U1} is satisfied it determines that "skill", T ₁₂ ≧ U1 is satisfied In this case, a rule for determining an unskilled person can be considered.

Incidentally, by using both the time difference _{T 12} and the time difference _{T 13, T} 12 <U1 is satisfied, and determines "skill" the subject when _{the T} 13 <U2 is satisfied, otherwise the It may be a rule for determining a subject as an “unskilled person”.

<Processing procedure>
Next, with reference to FIG. 8 and FIG. 9, detailed processing procedures of the sensor devices 30 and 40 and the terminal device 10 included in the measurement system 1 will be described.

(Sensor device 20, 30, 40)
Since the processing procedures of the sensor devices 20, 30, 40 are basically the same, the processing procedure of the sensor device 20 will be mainly described here.

  FIG. 8 is a flowchart showing a processing procedure of sensor device 20 according to the first embodiment. The following steps are realized by the CPU 202 executing a program stored in the memory 204.

  First, the sensor device 20 is attached to a predetermined attachment location of the pitching machine 22, and the power switch of the sensor device 20 is turned on (step S10).

  Next, when the ball is fired from the pitching machine 22 to which the sensor device 20 is attached, the CPU 202 uses the ball firing direction (hereinafter also referred to as “PM information”) as the movement information (hereinafter also referred to as “PM information”) of the attachment location of the pitching machine 22. The acceleration in the a-axis direction in FIG. 1 is acquired (step S11). Specifically, the CPU 202 receives an input of a signal corresponding to the acceleration by the acceleration sensor 206. The CPU 202 acquires PM information by calculating the acceleration based on the input signal.

  CPU202 transmits PM information acquired via the communication interface 210 to the terminal device 10 (step S12), and complete | finishes a process.

  In the processing procedure executed by the sensor device 30, the power switch of the sensor device 30 attached to the batter's back is turned on in step S10. In step S11, the CPU 202 controls the back of the batter when swinging. The movement information (back information) is acquired. In step S <b> 12, the CPU 202 transmits the back information acquired via the communication interface 210 to the terminal device 10. The back information includes accelerations in the three axis directions of the back of the batter.

  Similarly, in the processing procedure executed by the sensor device 40, the power switch of the sensor device 40 attached to the back of the batter is turned on in the above step S10, and in the above step S11, the CPU 202 performs the operation when the batter swings. Acquire waist movement information (waist information). In step S <b> 12, the CPU 202 transmits the waist information acquired via the communication interface 210 to the terminal device 10. The waist information includes an angular velocity around the body axis of the batter's waist (around the X axis in FIG. 1).

(Terminal device 10)
FIG. 9 is a flowchart showing a processing procedure of terminal apparatus 10 according to the first embodiment. The following steps are realized by the CPU 102 executing a program stored in the memory 104.

  Referring to FIG. 9, the CPU 102 of the terminal device 10 receives PM information from the sensor device 20 via the communication interface 120 (step S <b> 21). Subsequently, the CPU 102 determines whether or not the back information has been received from the sensor device 30 via the communication interface 120 (step S23). When the back information is received (YES in step S23), CPU 102 determines whether or not waist information has been received from sensor device 40 (step S25).

When the waist information is received (that is, the back information and the waist information are received) (YES in step S25), the CPU 102 evaluates the evaluation parameter based on the received PM information, the back information, and the waist information. as calculates the time difference _{T 12} and the time difference _{T 13} (step S27), and executes the processing of step S35 to be described later.

Here, the process in step S27 will be specifically described. Based on the acceleration in the firing direction of the ball included in the PM information and the acceleration in the triaxial direction in the back part included in the back information, the CPU 102 determines the time T when the absolute value of the acceleration in the firing direction reaches the threshold Th1. ₁ and, 3 the absolute value of the axial direction of the resultant acceleration calculates the time difference T ₁₂ between the time T _2, which reaches the threshold value Th2. Further, the CPU 102 determines the time T ₁ when the absolute value of the acceleration in the firing direction reaches the threshold Th1 based on the acceleration in the firing direction of the ball included in the PM information and the angular velocity around the body axis included in the waist information. If, to calculate the time difference _{T 13} between the time _{T 3} of the angular velocity reaches the threshold value Th3.

In step S25, when the waist information is not received (that is, only the back information is received) (NO in step S25), the CPU 102 uses the time difference T as an evaluation parameter based on the received back information. ₁₂ is calculated (step S29), and the process of step S35 described later is executed.

Next, when back information is not received in step S23 (NO in step S23), the CPU 102 determines whether or not waist information has been received (step S31). Receiving the lumbar information when (i.e., is receiving only the lumbar information) (YES in step S31), CPU 102 calculates the time difference _{T 13} (step S33), processing in step S35 to be described later Execute. On the other hand, when the waist information is not received (that is, neither the back information nor the waist information is received), the CPU 102 ends the process without executing the process of step S35.

The CPU 102 outputs the calculated result (step S35). Specifically, when calculating the time differences T ₁₂ and T ₁₃ in step S27, the CPU 102 displays these evaluation parameters on the display 110. CPU102, when calculates the time difference _{T 12} in step S29, displays this evaluation parameters on the display 110. Further, CPU 102, when calculates the time difference _{T 13} in step S33, displays this evaluation parameters on the display 110.

Note that the CPU 102 may evaluate the swing level of the subject from the calculated result and display the evaluation result on the display 110. Specifically, the CPU 102 determines whether the subject's swing level is the “expert” level or the “unskilled” level based on at least one of the calculated time difference T ₁₂ and time difference T ₁₃ and the rule described above. And the evaluation result (swing level) is displayed on the display 110.

  The CPU 102 may display each evaluation result separately, or may display one evaluation result by combining each evaluation result. That is, any display mode that can notify the subject of his / her swing level may be used.

[Embodiment 2]
In the measurement system 1 according to the first embodiment, the case has been described in which the terminal device 10 calculates the evaluation parameter based on the motion information received from the sensor devices 20, 30, and 40 and outputs the calculation result. In the second embodiment, a configuration in which a terminal device has a sensor function of a sensor device and functions as a measurement device for measuring a movement of a subject during a swing will be described. In the second embodiment, differences from the first embodiment will be described, and detailed description of the same configuration and function will not be repeated.

  FIG. 10 shows an overall configuration of measurement system 2 according to the second embodiment. The measurement system 2 includes a terminal device 10A attached to the waist of the batter, a sensor device 20 attached to the pitching machine 22, and a sensor device 30 attached to the back of the batter.

  The terminal device 10A is attached to the waist of the batter via a waist attachment member instead of the sensor device 40 in the first embodiment. Therefore, the terminal device 10A is preferably a portable device such as a smartphone or a tablet terminal. That is, the terminal device 10A is attached to the waist of the batter and functions as a measurement device for measuring the movement of the batter.

  FIG. 11 is a diagram showing a hardware configuration of terminal apparatus 10A according to the second embodiment. The terminal device 10A includes, as main components, a CPU 102, a memory 104, a touch panel 106, a button 108, a display 110, a wireless communication unit 112, a communication antenna 113, a memory interface (I / F) 114, A speaker 116, a communication interface (I / F) 118, a microphone 118, an acceleration sensor 206, and an angular velocity sensor 208 are included.

  The acceleration sensor 206 and the angular velocity sensor 208 function as a detection unit that can acquire movement information related to the movement of the waist during the swing of the subject. Since the other configuration of terminal device 10A is the same as the configuration of terminal device 10 shown in FIG. 4, detailed description thereof will not be repeated.

  FIG. 12 is a flowchart showing a processing procedure of terminal apparatus 10A according to the second embodiment. The following steps are realized by the CPU 102 executing a program stored in the memory 104.

  First, the terminal device 10A is attached to the waist of the batter, and the power switch of the terminal device 10A is turned on (step S41). Subsequently, the CPU 102 of the terminal device 10A receives PM information from the sensor device 20 via the communication interface 120 (step S43).

  Next, when the batter to which the terminal device 10A is attached swings, the CPU 102 acquires the angular velocity around the body axis included in the waist information when the batter swings, via the angular velocity sensor 208 (step S45).

Next, the CPU 102 determines whether or not the back information acquired by the sensor device 30 attached to the back of the batter is received via the communication interface 120 (step S47). When the back information is received (YES in step S47), the CPU 102 calculates the time differences T ₁₂ and T ₁₃ based on the PM information, the waist information, and the back information (step S49). And CPU102 displays the calculation result (step S53), and complete | finishes a process.

In contrast, in the case of not receiving the hand-back information (NO in step S47), CPU 102, based on the PM information and lumbar information, it calculates the time difference _{T 13} (step S51), the calculation result Displayed (step S53). Then, the CPU 102 ends the process.

  In the second embodiment, the case where the terminal device 10A is attached to the waist of the batter has been described. However, the terminal device 10A may be attached to the back instead of the sensor device 30 in the first embodiment. In this case, the sensor device 40 is attached to the waist of the batter. Then, the terminal device 10A calculates at least one evaluation parameter based on the acquired back information and the waist information received from the sensor device 40.

[Other embodiments]
Here, modifications and feature points of the above-described embodiment are listed.

(1) In the embodiment described above, the configuration in which the device having the sensor function is attached to the waist and back of the subject has been described, but the present invention is not limited to this. For example, the sensor device may be attached only to the back of the subject (or only the waist), the time difference T ₁₂ (or time difference T ₁₃ ) may be calculated, and the calculation result may be output.

  (2) In the above-described embodiment, the configuration in which the ball is fired from the pitching machine 22 has been described, but the present invention is not limited to this. For example, a configuration in which a person (pitcher) throws a ball toward a subject instead of a pitching machine may be used. In this case, the sensor device 20 is attached to the back part of the pitcher, and acquires the acceleration in the direction in which the ball is thrown by the pitcher. Thus, the subject's opponent may be a person (pitcher) and is not limited to a device (pitching machine).

  (3) In the above-described embodiment, the configuration in which the sensor device 20 is attached to the pitching machine 22 has been described, but is not limited thereto. For example, the sensor device 20 may be configured to be attached to the inside of the ball (that is, a configuration built in the ball).

  In this case, in order to match the direction of one of the three axial directions (for example, the a axis) of the acceleration sensor with the direction in which the ball is thrown, for example, the pitcher can grasp the direction of the a axis direction. A mark is placed and the pitcher throws the ball in the a-axis direction. Thereby, the timing at which the ball is released (that is, the release timing of the ball) can be calculated as the time when the absolute value of the acceleration in the direction in which the ball is released (here, the a-axis direction) reaches the threshold Th1.

  However, it may be difficult to match one of the three axial directions of the acceleration sensor to the direction in which the ball is released (that is, the direction in which the ball is thrown). Therefore, the timing at which the ball is released may be calculated by the following method.

  FIG. 13 is a diagram showing the time change of the acceleration acquired by the sensor device 20 incorporated in the ball. The acceleration shown in FIG. 13 is any one of the three axes (here, the a axis). Here, it is assumed that the pitcher throws a ball in which the sensor device 20 is built and the opponent catches the ball.

  Referring to FIG. 13, the sensor device 20 acquires acceleration time series data as shown in FIG. 13 by detecting acceleration in the a-axis direction in time series every sampling period (for example, 2 ms).

  The terminal device 10 receives the motion information acquired by the sensor device 20 (that is, time series data of acceleration in FIG. 13). The terminal apparatus 10 calculates the acceleration K (m) detected at the current sampling time t (m) and the acceleration K (m−1) detected at the sampling time t (m−1) one sampling period before. Differences are calculated sequentially.

The terminal device 10 calculates a sampling time t (m) at which this difference is greater than or equal to a threshold Th4 (for example, 2G) as the timing at which the ball is released. In the example of FIG. 13, the time T ₄ have been calculated as the ball is emitted timing.

After the ball is released, this difference is less than the threshold Th4 during the period in which the ball exists in the air. Then, the terminal device 10 calculates a sampling time t (m) at which the difference becomes less than the threshold Th4 and then becomes equal to or higher than the threshold Th5 (for example, 45G) as the timing when the ball is caught. In the example of FIG. 13, the time T _5, are calculated as the ball is caught timing. According to the above method, the pitcher can throw a ball without being aware of the axial direction of the acceleration sensor.

  (4) In the above-described embodiment, the configuration in which the sensor device 30 is attached to the back of the subject has been described. However, the configuration is not limited thereto. For example, the sensor device 30 may be configured to be attached to a grip end of a hitting tool (for example, a bat) used by a subject. In this case, the sensor device 30 is firmly fixed to the grip end so as not to move during the swing of the bat. Preferably, the acceleration sensor included in the sensor device 30 is disposed on the long axis of the bat in order to eliminate the influence of centrifugal acceleration due to rotation around the long axis of the bat.

  (5) In the above-described embodiment, the configuration in which the evaluation parameter or the swing level is displayed on the display has been described. However, the present invention is not limited to this. For example, the configuration may be such that the evaluation parameter or the swing level is notified to the subject by voice using a speaker or the like.

  (6) In the above-described embodiment, the terminal device receives the motion information transmitted from the sensor device, and calculates the evaluation parameter based on the motion information. I can't. For example, the terminal device may be configured to accept input of motion information acquired by the sensor device from the user via a touch panel or a button.

  (7) In the above-described embodiment, the terminal device 10 calculates the start timing of the back part and the waist part when the subject swings based on the combined acceleration at the back part and the angular velocity around the body axis at the waist part. The configuration has been described. At the time of swing, the movement of the back part is dominated by translational movement, and the movement of the waist part is dominated by rotational movement. Therefore, according to this configuration, it is considered that the start timing of the back part and the waist part can be calculated with high accuracy. .

  However, when the accuracy may be slightly reduced, the configuration may be such that the start timing of the back is calculated from the combined angular velocity at the back, or the start timing of the waist is calculated from the combined acceleration of the waist. May be. For example, an acceleration sensor is less expensive than an angular velocity sensor. Therefore, the cost can be reduced by adopting a configuration in which the start timings of the back part and the waist part are calculated based on the combined acceleration in each part.

(8) In the embodiment described above, hand-back part start timing has been described for the absolute value of the three-axis directions of the resultant acceleration at the hand-back part of the batter is time T _2, which reaches the threshold value Th2, the configuration Not limited to. For example, the back part start timing may be the time when the absolute value of the acceleration in the uniaxial direction in the back part reaches the threshold value Thx, or the absolute value of the combined acceleration in the biaxial direction in the back part reaches the threshold value Thy. It may be the time. In this case, a deviation in the mounting direction of the acceleration sensor or the mounting direction in use may be considered.

  From this, the back portion start timing may be any time when the absolute value of the combined acceleration in at least one of the three axis directions reaches a predetermined threshold value. Note that the threshold Thx and the threshold Thy may be set in advance by actually measuring the acceleration of the back part obtained at the start of the batter's swing, or may be set in advance by simulation or the like.

  (9) In the above-described embodiment, the case where the subject is a batter and the movement of the bat swing is described. However, the present invention is not limited to this. Sports (eg, tennis, table tennis, badminton) that are competitive, such as baseball (or softball, etc.) and require a quick response to the object (sphere, etc.) launched or thrown by the opponent , Cricket, etc.), it is possible to measure the swing of the subject during the swing and perform the swing evaluation.

  It is also possible to evaluate the movement of a sports subject who is a battle type and reacts quickly to an object released from the opponent. The inventors of the present application selected, for example, soccer as such a sport and conducted the following evaluation experiment.

  The measurement system for measuring the movement of the subject includes a terminal device 10, a sensor device Xa (corresponding to the sensor device 20 in FIG. 1) attached to the soccer ball launcher, and a sensor device attached to the waist of the subject. Xb (corresponding to the sensor device 40 of FIG. 1) and the sensor device Xc attached to the subject's foot (for example, ankle). The functions and hardware configurations of the sensor devices Xa to Xc are the same as those of the sensor devices 20 to 40.

  The sensor device Xa is attached to the launching device via an attachment member so that one of the three axes in the acceleration sensor faces the launching direction of the ball. The sensor device Xb is attached to the waist of the subject so that one of the three axes of the angular velocity sensor and the acceleration sensor faces the body axis of the subject. The sensor device Xc is attached to the subject's foot so that one of the three axes of the angular velocity sensor and the acceleration sensor is along the longitudinal direction of the subject's lower leg.

  As subjects, skilled persons who are experienced soccer players and unskilled persons who are inexperienced soccer players were selected. Each of an expert and an unskilled person is required to stand at a predetermined distance (for example, 5.0 m) from the launching device and quickly receive a soccer ball launched in a random direction with his / her foot. This assumes an operation of receiving a pass in soccer.

  Based on the movement information acquired from each of the sensor devices Xa to Xc, the terminal device 10 starts the soccer ball, the timing when the waist starts with respect to the ball to be fired, and the foot starts with respect to the ball. Timing is calculated.

  Specifically, the terminal device 10 calculates the time Ta when the absolute value of the acceleration in the ball firing direction measured by the sensor device Xa reaches a threshold value Tha (for example, 2G) as the soccer ball firing timing. The terminal device 10 calculates the time Tb when the absolute value of the angular velocity around the body axis at the waist measured by the sensor device Xb reaches a threshold Thb (for example, 10 deg / s) as the waist start timing. The terminal device 10 calculates a time Tc at which the absolute value of the combined acceleration in at least one axial direction measured by the sensor device Xc reaches a threshold Thc (for example, 2G) as the foot start timing.

  The terminal device 10 includes a time difference Tab between the time Ta and the time Tb (that is, a time from the launch timing to the waist start timing) and a time difference Tac between the time Ta and the time Tc (ie, from the launch timing to the foot start timing). Time). Furthermore, the terminal device 10 also calculates a time difference Tbc between the time Tb and the time Tc (that is, the time from the waist start timing to the foot start timing). FIG. 14 shows each time difference calculated by the terminal device 10.

  FIG. 14 is a diagram illustrating an example of a time difference tendency between an expert and an unskilled person. Specifically, FIG. 14A is a diagram showing the tendency of the time difference Tab, FIG. 14B is a diagram showing the tendency of the time difference Tac, and FIG. 14C is a diagram showing the tendency of the time difference Tbc. It is. The measurement result of the time difference shown in FIG. 14 is an average value of five time differences measured when each subject moves when the ball is fired five times from the launching device.

  Referring to FIG. 14A, the time difference Tab of the skilled person is 103.8 ms, and the time difference of the unskilled person is 147.4 ms, so that the skilled person has an average time difference Tab of 43 compared to the unskilled person. .6ms shorter. In other words, it can be seen that the skilled person has an earlier start timing of the lower back than the unskilled person.

  Referring to FIG. 14B, the time difference Tac of the skilled person is 318.6 ms, and the time difference Tac of the unskilled person is 173 ms. Therefore, the average time difference Tac of the skilled person is 145. 6ms long. That is, it can be seen that the skilled person has a slower start timing of the foot than the unskilled person.

  Referring to FIG. 14C, the time difference Tbc of the skilled person is 214.8 ms, and the time difference Tbc of the unskilled person is 25.6 ms. Therefore, the time difference Tbc of the skilled person is larger than that of the unskilled person on average. 189.2ms long. That is, the skilled person has a larger difference in the start timing of the waist and the foot than the unskilled person.

  From the result of FIG. 14, it can be seen that the skilled person starts the foot after turning the posture in the moving direction (that is, starting the waist). Therefore, it is considered that the skilled person can smoothly receive the ball properly after the start. Further, each time difference Tab, Tab, Tbc can be used as an evaluation parameter of the subject's movement.

  From the above result, a rule for determining the movement ability (motion level) of the subject may be created. For example, when the time difference Tab <threshold value Ua is satisfied, it is determined as an expert level, and when the time difference Tab ≧ the threshold value Ua is satisfied, it is determined as an unskilled person level. As the threshold value Ua, for example, an average value (125.6) of the time difference Tab (= 103.8) of the skilled person and the time difference Tab (= 147.4) of the unskilled person is used.

  The inventors of the present application additionally conducted the following evaluation experiment. In this evaluation experiment, each of an expert and an unskilled person stands at a predetermined distance (for example, 5.0 m) from the launching device and quickly receives a soccer ball fired in a random direction (in this case, a hand) Can be used). This assumes a PK (penalty kick) in soccer. FIG. 15 shows each time difference calculated by the terminal device 10.

  FIG. 15 is a diagram showing another example of the tendency of the time difference between the skilled person and the unskilled person. Specifically, FIG. 15A is a diagram showing the tendency of the time difference Tab, and FIG. 15B is a diagram showing the tendency of the time difference Tab. The measurement result of the time difference shown in FIG. 15 is an average value of the time difference for six times measured when each subject moves when the ball is fired six times from the launching device.

  Referring to FIG. 15A, the time difference Tab for the skilled person was 281.8 ms, and the time difference for the unskilled person was −76.7 ms. Referring to FIG. 15B, the time difference Tac for the skilled person was 176.8 ms, and the time difference Tac for the unskilled person was −54.7 ms.

  From this, it can be seen that under the conditions assuming PK, the skilled person tends to start after the ball is launched, and the unskilled person tends to start before the launch. Therefore, it is considered that an unskilled person is likely not to receive the ball properly.

  As described above, even if the sport is a battle type and responds quickly to an object released from the opponent (for example, a sport that does not perform a swing), based on each time difference as described above, The movement can be evaluated. In the above description, soccer has been described as an example of the sport. However, volleyball, basketball, rugby, American football, handball, and the like can be used to evaluate the movement of the subject.

  In the case of volleyball, it is assumed that a subject (eg, a receiver) receives a ball released from an opponent (eg, an attacker or a ball launcher). When the opponent is a person (attacker), the sensor device is attached to the back or arm of the attacker, and when the opponent is a ball launcher, the sensor device is attached. The timing at which the ball is released is the time when the acceleration of the acceleration sensor reaches the threshold value. In addition, a sensor device is attached to the back, arm, or foot of the subject, and another sensor device is attached to the waist or back neck (back of the neck) of the subject. The start timing of the back part, arm part or foot part is the time when the acceleration of the acceleration sensor reaches the threshold value. The start timing of the lower back or the rear neck is the time when the absolute value of the angular velocity around the body axis reaches the threshold value.

  In the case of basketball, rugby, American football, and handball, a scene in which a subject (eg, a pass recipient) receives a ball released from an opponent (eg, a passer) is assumed. In this case, the sensor device can be attached to the other party's back or arm. The timing at which the ball is released is the time when the acceleration of the acceleration sensor reaches the threshold value. In addition, a sensor device is attached to the back, arm, or foot of the subject, and another sensor device is attached to the waist or back neck of the subject. The start timing of the back part, arm part or foot part is the time when the acceleration of the acceleration sensor reaches the threshold value. The start timing of the lower back or the rear neck is the time when the absolute value of the angular velocity around the body axis reaches the threshold value.

  In the case of a handball, it is also assumed that a subject (eg, a keeper) receives a ball released from an opponent (eg, a shooter or a ball launcher). When the opponent is a person (shooter), the sensor device is attached to the back or arm of the shooter, and when the opponent is a ball launcher, it is attached to the device. The timing at which the ball is released is the time when the acceleration of the acceleration sensor reaches the threshold value. In addition, a sensor device is attached to the back, arm, or foot of the subject (keeper), and another sensor device is attached to the waist or back neck of the subject. The start timing of the back part, arm part or foot part is the time when the acceleration of the acceleration sensor reaches the threshold value. The start timing of the lower back or the rear neck is the time when the absolute value of the angular velocity around the body axis reaches the threshold value.

  According to the above, since the time difference between the start timings can be calculated even in volleyball, basketball, rugby, American football, handball, etc., the movement of the subject can be evaluated based on each time difference.

  (10) In the above-described embodiment, it is possible to provide a program for causing a computer to function and executing control as described in the above flowchart. Such a program is recorded on a non-temporary computer-readable recording medium such as a flexible disk attached to the computer, a CD-ROM (Compact Disk Read Only Memory), a ROM, a RAM, and a memory card as a program product. It can also be provided. Alternatively, the program can be provided by being recorded on a recording medium such as a hard disk built in the computer. A program can also be provided by downloading via a network.

  The program may be a program module that is provided as a part of a computer operating system (OS) and that calls a required module at a predetermined timing to execute processing. In that case, the program itself does not include the module, and the process is executed in cooperation with the OS. A program that does not include such a module can also be included in the program according to the present embodiment.

  Further, the program according to the present embodiment may be provided by being incorporated in a part of another program. Even in this case, the program itself does not include the module included in the other program, and the process is executed in cooperation with the other program. A program incorporated in such another program can also be included in the program according to the present embodiment.

  (11) The configuration exemplified as the above-described embodiment is an example of the configuration of the present invention, and can be combined with another known technique. A part of the configuration is not deviated from the gist of the present invention. It is also possible to change and configure such as omitting.

  In the above-described embodiment, the processing and configuration described in the other embodiments and the processing and configuration described in the modification may be appropriately adopted and implemented.

[Effect of the embodiment]
According to the present embodiment, it is possible to objectively know the characteristics of each movement related to the waist and back (arm) that are important during swing.

  According to the present embodiment, it is possible to measure the movement during the swing when the subject actually hits the ball. In addition, it is possible to measure the movement at the time of swing with a familiar ball hitting tool owned by the subject himself / herself without requiring a ball hitting tool such as a dedicated bat or racket. Therefore, the subject can grasp the characteristics of the movement and the swing level at the time of the swing closer to the actual battle.

  According to the present embodiment, it is only necessary to attach a small device to the subject's waist and back and swing, so that simple measurement can be performed without placing a burden on the subject. Moreover, since the test subject can obtain the swing evaluation result in real time, an efficient training effect can be expected by quick feedback.

  According to the present embodiment, it is possible to evaluate the movement of the subject even in a competitive sport that does not swing such as a ball hitting tool.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1, 2 measurement system 10, 10A terminal device, 20, 30, 40 sensor device, 22 pitching machine, 102, 202 CPU, 104, 204 memory, 106 touch panel, 108 buttons, 110 display, 112 wireless communication unit, 113 communication Antenna, 114 memory interface, 115 storage medium, 116 speaker, 118 microphone, 120, 210 communication interface, 206 acceleration sensor, 208 angular velocity sensor, 212 storage battery.

Claims (14)

A measurement system for measuring a subject's movement relative to an object,
A first detection means attached to the subject's partner or the object and capable of detecting first movement information relating to the movement of the partner when the object is released from the partner toward the subject; ,
Second detection means attached to the waist of the subject and capable of detecting second motion information relating to the motion of the waist of the subject relative to the object;
Processing means for calculating an evaluation parameter of the movement of the subject based on the first movement information and the second movement information;
And an output means for outputting the evaluation parameter obtained by the processing means. The processing means includes
Calculating a first timing at which the object is released based on the first movement information;
Based on the second movement information, a second timing at which the subject's waist is started relative to the object is calculated,
The measurement system according to claim 1, wherein a time difference between the first timing and the second timing is calculated as the evaluation parameter. The first movement information includes an acceleration in a direction in which the object is released,
The second movement information includes an angular velocity around the body axis of the subject,
The first timing is a time when the absolute value of the acceleration reaches a first threshold value,
The measurement system according to claim 2, wherein the second timing is a time at which an absolute value of the angular velocity reaches a second threshold value. A measurement system for measuring a subject's movement during a swing relative to an object,
A first detection means attached to the subject's partner or the object and capable of detecting first movement information relating to the movement of the partner when the object is released from the partner toward the subject; ,
Second detection means attached to the back of the subject or the grip end of a hitting tool used by the subject and capable of detecting second movement information relating to the movement of the back when the subject swings relative to the object. When,
Processing means for obtaining an evaluation parameter of a swing by the subject based on the first movement information and the second movement information;
And an output means for outputting the evaluation parameter obtained by the processing means. The processing means includes
Calculating a first timing at which the object is released based on the first movement information;
Based on the second movement information, calculating a second timing at which the subject's back is started when the subject swings,
The measurement system according to claim 4, wherein a time difference between the first timing and the second timing is calculated as the evaluation parameter. The first movement information includes a direction in which the object is fired or an acceleration in a direction in which the object is thrown,
The second movement information includes acceleration in at least one of the three axial directions in the subject,
The first timing is a time when the absolute value of the acceleration reaches a first threshold value,
The measurement system according to claim 5, wherein the second timing is a time at which an absolute value of the combined acceleration in the at least one axial direction reaches a second threshold value. A measurement system for measuring a subject's movement relative to an object,
A first detection means attached to the subject's partner or the object and capable of detecting first movement information relating to the movement of the partner when the object is released from the partner toward the subject; ,
A second detection means attached to a predetermined part other than the waist of the subject and capable of detecting second movement information relating to the movement of the predetermined part of the subject relative to the object;
A third detection means attached to the waist of the subject and capable of detecting third movement information relating to the motion of the waist of the subject relative to the object;
Processing means for determining a plurality of evaluation parameters of the swing by the subject based on the first movement information, the second movement information, and the third movement information;
And an output unit that outputs the plurality of evaluation parameters obtained by the processing unit. The processing means includes
Calculating a first timing at which the object is released based on the first movement information;
Based on the second movement information, a second timing at which the predetermined part of the subject starts with respect to the object is calculated,
Based on the third movement information, a third timing at which the waist of the subject starts with respect to the object is calculated,
A first time difference between the first timing and the second timing is calculated as a first evaluation parameter, and a second time between the first timing and the third timing is calculated as a second evaluation parameter. The measurement system according to claim 7, wherein the time difference is calculated. The first movement information includes an acceleration in a direction in which the object is released,
The second movement information includes acceleration in at least one of the three axial directions in the predetermined part of the subject,
The third movement information includes an angular velocity around the body axis of the subject,
The first timing is a time when the absolute value of the acceleration reaches a first threshold value,
The second timing is a time when the absolute value of the combined acceleration in the at least one axis direction reaches a second threshold value,
The measurement system according to claim 8, wherein the third timing is a time at which an absolute value of the angular velocity reaches a third threshold value. The processing means evaluates the movement level of the subject based on the evaluation parameter acquired from the subject and a predetermined rule.
The measurement system according to claim 1, wherein the output unit further outputs the operation level. A measuring device attached to the waist of the subject, for measuring the movement of the subject relative to the object,
First input means for receiving input of first movement information related to movement of the opponent when the object is released from the opponent side of the subject toward the subject;
Detecting means capable of detecting second movement information relating to movement of the waist of the subject relative to the object;
Processing means for obtaining an evaluation parameter of a swing by the subject based on the first movement information and the second movement information;
And an output unit that outputs the evaluation parameter obtained by the processing unit. A measuring device attached to the waist of the subject, for measuring the movement of the subject relative to the object,
First input means for receiving input of first movement information related to movement of the opponent when the object is released from the opponent side of the subject toward the subject;
Detecting means capable of detecting second movement information relating to movement of the waist of the subject relative to the object;
Second input means for receiving input of third movement information relating to movement of a predetermined part other than the waist of the subject relative to the object;
Processing means for obtaining a plurality of evaluation parameters of the movement of the subject based on the first movement information, the second movement information, and the third movement information;
And an output unit that outputs the evaluation parameter obtained by the processing unit. A measurement method for measuring a subject's movement relative to an object,
Detecting first movement information relating to movement of the opponent when the object is released from the opponent side of the subject toward the subject;
Detecting second movement information relating to movement of the waist of the subject relative to the object;
Obtaining an evaluation parameter of the subject's movement based on the first movement information and the second movement information;
Outputting the evaluation parameter. A control program attached to the waist of a subject and executed by a computer of a measuring device for measuring the movement of the subject relative to an object,
The control program is stored in the computer.
Receiving input of first movement information related to movement of the opponent when the object is released from the opponent side of the subject toward the subject;
Detecting second movement information relating to movement of the waist of the subject relative to the object;
Obtaining an evaluation parameter of the movement of the subject based on the first movement information and the second movement information;
And a step of outputting the evaluation parameter.

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