Swing simulation system, swing simulation apparatus, and swing simulation method
Provided is a swing simulation system capable of simulating a swing without amplifying errors contained in measured values on three-dimensional coordinates of a grip during the swing. The simulation system according to the present invention includes: at least two imaging devices for imaging identification features capable of identifying a closed virtual plane that follows a grip of a golf club during a swing; and a simulation apparatus for simulating a behavior of the golf club during the swing, based on position information on the virtual plane.
1. A simulation system for simulating a behavior of a golf club during a swing made by a golfer using the golf club, comprising:
at least two imaging devices for capturing images of at least three identification features capable of locating a closed virtual plane, defined by the at least three identification features, that follows a grip of the golf club during the swing; and
a simulation apparatus for simulating the behavior of the golf club during the swing, based on position information on the virtual plane.
2. The simulation system according to claim 1 ,
wherein the simulation apparatus includes:
an image acquiring portion for acquiring, from the imaging devices, the images of the identification features captured during the swing;
a position information acquiring portion for recognizing the identification features from the images thus acquired and acquiring position information on the virtual plane based on position information on the identification features thus recognized; and
a simulation portion for simulating the behavior of the golf club during the swing by associating the position information on the virtual plane with a golf club model.
3. The simulation system according to claim 2 ,
wherein the simulation apparatus further includes a filtering portion for filtering, using a low-pass filter, the position information on the virtual plane acquired by the position information acquiring portion; and
wherein the simulation portion simulates the behavior of the golf club during the swing, based the filtered position information on the virtual plane.
4. The simulation system according to claim 3 ,
wherein the low-pass filter has a cutoff frequency Z (Hz) that satisfies:
Z=k ·(1/ X ), k≧ 3
where,
X: time (in seconds) it takes from the start of the down swing to the impact; and
k: the filter factor (constant).
5. The simulation system according to claim 3 , wherein the golf club model has a grip portion and a shaft portion of the golf club formed as elastic bodies.
6. The simulation system according to claim 1 , wherein the at least three identification features are not aligned on the same line.
7. A simulation method for simulating a behavior of a golf club during a swing made by a golfer using the golf club, comprising the steps of:
attaching at least three identification features to the golf club in such a manner of allowing the identification features to locate a closed virtual plane that follows a grip of the golf club during the swing;
imaging, by at least two imaging devices, the identification features during the swing;
acquiring, from position information on the at least three identification features thus imaged, position information on the closed virtual plane, defined by the at least three identification features, that follows the grip of the golf club, and simulating the behavior of the golf club during the swing based on position information on the virtual plane.
8. The swing simulation method according to claim 7 , further comprising the step of filtering, using a low-pass filter, the position information on the virtual plane,
wherein the step of simulating the swing includes the use of the filtered position information on the virtual plane.