Motion analysis apparatus, motion analysis system, motion analysis method, recording medium, and display method

Abstract

A golf swing analysis apparatus detects a state of a shaft of a golf club by using an output from an inertial sensor, calculates a relative rotation angle of the shaft which changes about an axis of the shaft until the shaft transitions from a first state to a second state due to a swing of the shaft, and compares the calculated relative rotation angle with a reference relative rotation angle in a reference swing which is used as a reference, with respect to at least one of a change range of the relative rotation angle, the required time from the first state to a state in which the relative rotation angle becomes the maximum, and the maximum value of the relative rotation angle, and outputs a comparison result.

What is claimed is: 
     
         1 . A motion analysis apparatus comprising:
 a detection portion that detects a state of a shaft of an exercise equipment by using an output from an inertial sensor;   a calculation portion that calculates a relative rotation angle of the shaft which changes about an axis of the shaft until the shaft transitions from a first state to a second state due to a swing of the exercise equipment; and   a comparison calculation portion that compares the relative rotation angle calculated by the calculation portion with a reference relative rotation angle in a reference swing which is used as a reference, with respect to at least one of a change range of the relative rotation angle, the required time from the first state to a state in which the relative rotation angle becomes the maximum, and the maximum value of the relative rotation angle, and outputs a comparison result.   
     
     
         2 . The motion analysis apparatus according to  claim 1 ,
 wherein the exercise equipment is a golf club, and   wherein the first state is a top state, and the second state is an impact state.   
     
     
         3 . The motion analysis apparatus according to  claim 2 ,
 wherein the reference swing is a swing using a golf club which is different from the golf club.   
     
     
         4 . The motion analysis apparatus according to  claim 2 ,
 wherein the reference swing is a swing performed by a user who is different from a user performing the swing.   
     
     
         5 . The motion analysis apparatus according to  claim 1 ,
 wherein the comparison calculation portion normalizes the relative rotation angle in the first state as an initial value, and compares a relative rotation angle calculated with the passage of transition time from the first state to the second state, with the reference relative rotation angle.   
     
     
         6 . The motion analysis apparatus according to  claim 1 , further comprising:
 a display portion that displays the comparison result.   
     
     
         7 . A motion analysis system comprising:
 the motion analysis apparatus according to  claim 1 ; and   an inertial sensor.   
     
     
         8 . A motion analysis system comprising:
 the motion analysis apparatus according to  claim 2 ; and   an inertial sensor.   
     
     
         9 . A motion analysis system comprising:
 the motion analysis apparatus according to  claim 3 ; and   an inertial sensor.   
     
     
         10 . A motion analysis system comprising:
 the motion analysis apparatus according to  claim 4 ; and   an inertial sensor.   
     
     
         11 . A motion analysis system comprising:
 the motion analysis apparatus according to  claim 5 ; and   an inertial sensor.   
     
     
         12 . A motion analysis system comprising:
 the motion analysis apparatus according to  claim 6 ; and   an inertial sensor.   
     
     
         13 . A motion analysis method comprising:
 detecting a state of a shaft of an exercise equipment by using an output from an inertial sensor;   calculating a relative rotation angle of the shaft which changes about an axis of the shaft until the shaft transitions from a first state to a second state due to a swing of the exercise equipment; and   comparing the calculated relative rotation angle with a reference relative rotation angle in a reference swing which is used as a reference, with respect to at least one of a change range of the relative rotation angle, the required time from the first state to a state in which the relative rotation angle becomes the maximum, and the maximum value of the relative rotation angle, and outputting a comparison result.   
     
     
         14 . A recording medium recording a program causing a computer to execute:
 detecting a state of a shaft of an exercise equipment by using an output from an inertial sensor;   calculating a relative rotation angle of the shaft which changes about an axis of the shaft until the shaft transitions from a first state to a second state due to a swing of the exercise equipment; and   comparing the calculated relative rotation angle with a reference relative rotation angle in a reference swing which is used as a reference, with respect to at least one of a change range of the relative rotation angle, the required time from the first state to a state in which the relative rotation angle becomes the maximum, and the maximum value of the relative rotation angle, and outputting a comparison result.   
     
     
         15 . A display method comprising:
 displaying transition of a relative rotation angle of a shaft which changes about an axis of the shaft until the shaft transitions from a first state to a second state due to a swing of an exercise equipment, and reference transition of a relative rotation angle in a reference swing which is used as a reference, in an overlapping manner by normalizing the relative rotation angle in the first state as an initial value.