Method and a system for tracking and analyzing a trajectory of a moving object, and for providing a score of such a trajectory
The present invention relates to tracking and analyzing a trajectory of a moving object, like a sports equipment used in an exercise. The present invention to provides a solution for tracking and analyzing a trajectory of a moving object in such a way, that the trajectories can be analyzed and compared to reference data created for the purpose, in order to evaluate and score the movement of the object—including a performance of a person using the object.
1. A method for tracking and analyzing a trajectory of a moving object by measuring the acceleration and direction of said object, and for producing a set of position data and by saving said position data in a memory as a data set;
the method comprising steps of:
defining at least one trajectory as a target trajectory along which said moving object should move;
retrieving from said memory said data set of position data;
analyzing said position data to produce a trajectory of said moving object;
comparing said trajectory to said predefined target trajectory; and
producing a score indicative of how closely said trajectory of the moving object follows said target trajectory, wherein the data set of position data is compared to at least two data sets of predefined target trajectories, whereby the length of the actual performance is scaled to the length of each of the predefined trajectories, and the selection of the predefined trajectory closest to the trajectory of the moving object is done by calculating the correlation between each of the predefined trajectories and said trajectory of the moving object, and producing a score based on said correlation and indicative of how closely said trajectory of the moving object follows said selected target trajectory.
2. A method according to claim 1 , wherein the selected target trajectory is informed to the user as a recognized trick.
3. A method according to claim 1 , wherein the data set of position data is compared to a data set of a target trajectory pre-selected by the user, whereby the length of the actual performance is scaled to the length of the pre-selected and predefined trajectory, the correlation between the predefined trajectory and said trajectory of the moving object is calculated, and producing a score based on said correlation and indicative of how closely said trajectory of the moving object follows said selected target trajectory.
4. A system for tracking and analyzing a trajectory of a moving object ( 1 ; 7 ), including sensors ( 5 ; 10 , 11 ) for measuring the acceleration and direction of said object, and means for producing a set of position data of said object for saving said position data in a memory as a data set;
wherein the system comprises means ( 3 ; 8 ; 12 ) for retrieving from said memory said data set of position data and to produce a trajectory of said moving object, means to compare said trajectory to a predefined target trajectory, and means to produce a score indicative of how closely said trajectory of the moving object follows said target trajectory,
wherein the data set of position data is compared to at least two data sets of predefined target trajectories, whereby the length of the actual performance is scaled to the length of each of the predefined trajectories, and the selection of the predefined trajectory closest to the trajectory of the moving object is done by calculating the correlation between each of the predefined trajectories and said trajectory of the moving object, and producing a score based on said correlation and indicative of how closely said trajectory of the moving object follows said selected target trajectory.
5. A system according to claim 4 , wherein the sensors ( 10 , 11 ) and the means ( 12 ) for measuring the movement and producing and saving the position data for said object is integrated in the sports equipment, together with a wireless interface ( 13 a ).
6. A system according to claim 5 , wherein the target trajectory is a trajectory of a predefined skateboard trick or a snowboard trick.
7. A system according to claim 4 , wherein the target trajectory is a trajectory of a predefined skateboard trick or a snowboard trick.