Feedback apparatus and method for improving x-factor

Abstract

An X-factor feedback apparatus senses three-dimensional direction information of the shoulder and the pelvis in a golf swing motion of a user, collects, synchronizes and stores the sensed three-dimensional direction information, analyzes the change of angle in the three-dimensional direction information based on the stored data information, extracts a backswing top point in the swing motion, evaluates the degree of twist of the shoulder and the pelvis based on the angle in the three-dimensional direction information of the shoulder and the pelvis at the backswing top point, and provides a feedback to the user.

What is claimed is: 
     
         1 . An X-factor feedback apparatus, comprising:
 a sensing unit for sensing three-dimensional direction information of the shoulder, the pelvis and a golf club in a golf swing motion of a user;   an analyzing unit for calculating the change of an angle in the three-dimensional direction information and extracting a backswing top point from the swing motion;   a determining unit for determining an angle in the three-dimensional direction information of the shoulder and the pelvis at the backswing top point; and   an output unit for providing feedback information to a user based on the determined angle.   
     
     
         2 . The X-factor feedback apparatus according to  claim 1 , wherein the analyzing unit includes:
 a calculating unit for calculating a relative angle change of the golf club based on the change of an angle in the three-dimensional direction information and an address posture; and   a point extracting unit for extracting the backswing top point based on the calculated change of angle.   
     
     
         3 . The X-factor feedback apparatus according to  claim 1 , wherein the sensing unit includes an IMU sensor or a vision sensor. 
     
     
         4 . The X-factor feedback apparatus according to  claim 1 , wherein the output unit provides the feedback information to the user based on a relation table relating to a feedback comment and a score according to an angle between the shoulder and the pelvis, previously stored. 
     
     
         5 . The X-factor feedback apparatus according to  claim 1 , further comprising a data storing unit for collecting, synchronizing and storing the sensed three-dimensional direction information,
 wherein the analyzing unit calculates the angle in three-dimensional direction information of the shoulder and the pelvis based on the stored data information.   
     
     
         6 . The X-factor feedback apparatus according to  claim 1 , wherein the output unit provides the feedback information to the user by using a display device or sound device having a graphic-based interface or a voice-based interface. 
     
     
         7 . An X-factor feedback method, comprising:
 sensing three-dimensional direction information of the shoulder, the pelvis and a golf club in a golf swing motion of a user;   calculating the change of an angle in the three-dimensional direction information of the shoulder and the pelvis;   extracting a backswing top point in the swing motion;   determining an angle in the three-dimensional direction information of the shoulder and the pelvis at the backswing top point; and   providing feedback information to the user based on the determined angle.   
     
     
         8 . The X-factor feedback method according to  claim 7 ,
 wherein said calculating of the change of an angle in the three-dimensional direction information of the shoulder and the pelvis includes calculating a relative angle change of the golf club based on an address posture,   wherein said extracting of a backswing top point in the swing motion includes extracting the backswing top point based on the change of a calculated angle of the golf club.   
     
     
         9 . The X-factor feedback method according to  claim 7 , wherein said calculating of the change of an angle in the three-dimensional direction information of the shoulder and the pelvis uses an equation defined below:
     x   upper   ·x   heap   =∥x   upper   ∥∥x   heap ∥cos(θ),0≦θ≦π
   where θ represents a relative angle of the shoulder and the pelvis in a three-dimensional space, x upper  represents a three-dimensional direction vector of the shoulder, and x heaf  represents a three-dimensional direction vector of the pelvis.   
     
     
         10 . The X-factor feedback method according to  claim 8 , wherein, in said extracting of a backswing top point in the swing motion, a point where an angular speed of the calculated golf club is 0 is defined as the backswing top point. 
     
     
         11 . The X-factor feedback method according to  claim 7 , wherein, in said providing of feedback information to the user, a feedback comment and a score are provided to the user based on a relation table relating to a feedback comment and a score according to an angle between the shoulder and the pelvis, previously stored. 
     
     
         12 . The X-factor feedback method according to  claim 11 , wherein the relation table is configured so that the angle between the shoulder and the pelvis is divided into a plurality of sections in the range of 43° to 53°. 
     
     
         13 . The X-factor feedback method according to  claim 7 , further comprising:
 collecting, synchronizing and storing the sensed three-dimensional direction information,   wherein, in said calculating of the change of an angle in the three-dimensional direction information of the shoulder and the pelvis, the change of angle is calculated based on the stored data information.   
     
     
         14 . The X-factor feedback method according to  claim 7 , wherein said providing of feedback information to the user includes:
 providing the feedback information to the user by using a display device or a sound device having a graphic-based interface or a voice-based interface.