Motion analysis device, motion analysis system, motion analysis method, program, and recording medium

Abstract

A motion analysis device includes: a first specifying unit that specifies a first axis which lies in a longitudinal direction of a shaft of an exercise tool at an address posture of a user, using an output of an inertial sensor; a second specifying unit that specifies a second axis forming a predetermined angle along with the first axis, using a hitting direction as a rotation axis; and an adjustment unit that adjusts sizes of an angle of the first axis and an angle of the second axis relative to a plane according to a predetermined condition.

What is claimed is: 
     
         1 . A motion analysis device comprising:
 a first specifying unit that specifies a first axis which lies in a longitudinal direction of a shaft of an exercise tool at an address posture of a user, using an output of an inertial sensor;   a second specifying unit that specifies a second axis forming a predetermined angle along with the first axis, using a hitting direction as a rotation axis; and   an adjustment unit that adjusts sizes of an angle of the first axis and an angle of the second axis relative to a plane according to a predetermined condition.   
     
     
         2 . The motion analysis device according to  claim 1 ,
 wherein the predetermined condition is a type of swing of the user, and   wherein the adjustment unit adjusts at least one of the angle of the first axis and the angle of the second axis according to the type of swing.   
     
     
         3 . The motion analysis device according to  claim 2 ,
 wherein the type of swing is a slice or a hook,   wherein when the type of swing is the slice, the adjustment unit increases at least the angle of the second axis, and   wherein when the type of swing is the hook, the adjustment unit decreases at least the angle of the first axis.   
     
     
         4 . The motion analysis device according to  claim 1 ,
 wherein the predetermined condition is a skill level of the user, and   wherein the adjustment unit adjusts the predetermined angle between the first and second axes according to the skill level.   
     
     
         5 . The motion analysis device according to  claim 4 ,
 wherein the adjustment unit increases the predetermined angle as the skill level is lower, and   wherein the adjustment unit decreases the predetermined angle as the skill level is higher.   
     
     
         6 . The motion analysis device according to  claim 1 ,
 wherein the first specifying unit calculates an angle of the shaft relative to the plane using an output of the inertial sensor at the address posture, and specifies the first axis using information regarding a length of the shaft and this angle.   
     
     
         7 . The motion analysis device according to  claim 1 ,
 wherein when the hitting direction is a third axis, the first specifying unit specifies a first imaginary plane including the first and third axes and the second specifying unit specifies a second imaginary plane including the second and third axes.   
     
     
         8 . The motion analysis device according to  claim 1 ,
 wherein the exercise tool includes a blow surface, and   wherein the hitting direction is a direction perpendicular to the blow surface at the address posture.   
     
     
         9 . The motion analysis device according to  claim 1 , further comprising:
 an image generation unit that generates image data including the first and second axes.   
     
     
         10 . The motion analysis device according to  claim 9 , further comprising:
 a motion analysis unit that calculates a trajectory of the exercise tool based on a swing of the user,   wherein the image generation unit generates image data including the first axis, the second axis, and the trajectory.   
     
     
         11 . A motion analysis system comprising:
 an inertial sensor;   a first specifying unit that specifies a first axis which lies in a longitudinal direction of a shaft of an exercise tool at an address posture of a user, using an output of the inertial sensor;   a second specifying unit that specifies a second axis forming a predetermined angle along with the first axis, using a hitting direction as a rotation axis; and   an adjustment unit that adjusts sizes of an angle of the first axis and an angle of the second axis relative to a plane according to a predetermined condition.   
     
     
         12 . The motion analysis system according to  claim 11 ,
 wherein the predetermined condition is a type of swing of the user, and   wherein the adjustment unit adjusts at least one of the angle of the first axis and the angle of the second axis according to the type of swing.   
     
     
         13 . The motion analysis system according to  claim 12 ,
 wherein the type of swing is a slice or a hook,   wherein when the type of swing is the slice, the adjustment unit increases at least the angle of the second axis, and   wherein when the type of swing is the hook, the adjustment unit decreases at least the angle of the first axis.   
     
     
         14 . The motion analysis system according to  claim 11 ,
 wherein the predetermined condition is a skill level of the user, and   wherein the adjustment unit adjusts the predetermined angle between the first and second axes according to the skill level.   
     
     
         15 . An motion analysis method comprising:
 specifying a first axis which lies in a longitudinal direction of a shaft of an exercise tool at an address posture of a user, using an output of an inertial sensor;   specifying a second axis forming a predetermined angle along with the first axis, using a hitting direction as a rotation axis; and   adjusting sizes of an angle of the first axis and an angle of the second axis relative to a plane according to a predetermined condition.   
     
     
         16 . The motion analysis method according to  claim 15 ,
 wherein the predetermined condition is a type of swing of the user, and   wherein in the adjusting of the sizes of the angles, at least one of the angle of the first axis and the angle of the second axis is adjusted according to the type of swing.   
     
     
         17 . The motion analysis method according to  claim 16 ,
 wherein the type of swing is a slice or a hook,   wherein when the type of swing is the slice, at least the angle of the second axis is increased in the adjusting of the sizes of the angles, and   wherein when the type of swing is the hook, at least the angle of the first axis is decreased in the adjusting of the sizes of the angles.   
     
     
         18 . The motion analysis method according to  claim 15 ,
 wherein the predetermined condition is a skill level of the user, and   wherein in the adjusting of the sizes of the angles, the predetermined angle between the first and second axes is adjusted according to the skill level.   
     
     
         19 . A program causing a computer to perform:
 specifying a first axis which lies in a longitudinal direction of a shaft of an exercise tool at an address posture of a user, using an output of an inertial sensor;   specifying a second axis forming a predetermined angle along with the first axis, using a hitting direction as a rotation axis; and   adjusting sizes of an angle of the first axis and an angle of the second axis relative to a plane according to a predetermined condition.   
     
     
         20 . A recording medium that records a program causing a computer to perform:
 specifying a first axis which lies in a longitudinal direction of a shaft of an exercise tool at an address posture of a user, using an output of an inertial sensor;   specifying a second axis forming a predetermined angle along with the first axis, using a hitting direction as a rotation axis; and   adjusting sizes of an angle of the first axis and an angle of the second axis relative to a plane according to a predetermined condition.   
     
     
         21 . A motion analysis device comprising:
 an adjustment unit that adjusts a size of a center angle of a V zone according to a predetermined condition.   
     
     
         22 . The motion analysis device according to  claim 21 ,
 wherein the predetermined condition is a skill level of the user, and   wherein the adjustment unit adjusts the center angle according to the skill level.   
     
     
         23 . The motion analysis device according to  claim 22 ,
 wherein the adjustment unit increases the center angle as the skill level is lower, and   wherein the adjustment unit decreases the center angle as the skill level is higher.   
     
     
         24 . The motion analysis device according to  claim 21 ,
 wherein an exercise tool includes a blow surface, and   wherein the hitting direction is a direction perpendicular to the blow surface at a address posture of a user.   
     
     
         25 . The motion analysis device according to  claim 21 , further comprising:
 an image generation unit that generates image data including the V zone.   
     
     
         26 . The motion analysis device according to  claim 25 , further comprising:
 a motion analysis unit that calculates a trajectory of an exercise tool based on a swing of the user,   wherein the image generation unit generates image data including the V zone and the trajectory.