Method of ball game motion recognition, apparatus for the same, and motion assisting device
First Claim
1. A method of ball game motion recognition, comprising:
- obtaining motion parameters corresponding to each sampling time for a motion;
extracting feature points according to predetermined feature point recognition tactics utilizing the motion parameters obtained, wherein the feature point recognition tactics comprise recognition tactics of at least three types of the feature points, comprising;
power-assisting path early stage corresponding feature point, motion top point corresponding feature point, and ball hitting time corresponding feature point; and
recognizing the motion as a predetermined ball game type if the feature points extracted satisfy feature point requirements of the predetermined ball game type;
wherein the recognition tactics of the power-assisting path early stage corresponding feature point comprise;
both ratios of velocity in the first dimension to velocity in the other two dimensions being larger than a predetermined power-assisting path early stage corresponding feature point ratio;
the recognition tactics of the motion top point corresponding feature point comprises;
velocity in a second dimension being smaller than a predetermined motion top point corresponding feature point velocity threshold; and
the recognition tactics of the ball hitting time corresponding feature point comprise;
recognizing the ball hitting time corresponding feature point if, at the sampling time t, a value of min(α
∥
Xt−
Xinit∥
+β
∥
Tt−
Tinit∥
) is smaller than a predetermined ball hitting time corresponding feature point threshold, wherein α and
β
are predetermined parameters, Xt is a position corresponding to the sampling time t, Xinit is a position corresponding to an original time to of the motion, Tt is a stance corresponding to the sampling time t, and Tinit is a stance corresponding to the original time to of the motion; and
recognizing the ball hitting time corresponding feature point if, at the sampling time, an acceleration change rate is larger than a predetermined ball hitting time acceleration change rate threshold.
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Abstract
The invention provides a method of ball game motion recognition, an apparatus for the same, and a motion assisting device. The method comprises: obtaining motion parameters corresponding to each sampling time for a motion; extracting feature points according to predetermined feature point recognition tactics utilizing the motion parameters obtained, in which the feature point recognition tactics comprise recognition tactics of at least three types of the feature points, comprising: power-assisting path early stage corresponding feature point, motion top point corresponding feature point, and ball hitting time corresponding feature point; and recognizing the motion as a predetermined ball game type if the feature points extracted satisfy feature point requirements of the predetermined ball game type.
77 Citations
28 Claims
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1. A method of ball game motion recognition, comprising:
-
obtaining motion parameters corresponding to each sampling time for a motion; extracting feature points according to predetermined feature point recognition tactics utilizing the motion parameters obtained, wherein the feature point recognition tactics comprise recognition tactics of at least three types of the feature points, comprising;
power-assisting path early stage corresponding feature point, motion top point corresponding feature point, and ball hitting time corresponding feature point; andrecognizing the motion as a predetermined ball game type if the feature points extracted satisfy feature point requirements of the predetermined ball game type; wherein the recognition tactics of the power-assisting path early stage corresponding feature point comprise;
both ratios of velocity in the first dimension to velocity in the other two dimensions being larger than a predetermined power-assisting path early stage corresponding feature point ratio;the recognition tactics of the motion top point corresponding feature point comprises;
velocity in a second dimension being smaller than a predetermined motion top point corresponding feature point velocity threshold; andthe recognition tactics of the ball hitting time corresponding feature point comprise; recognizing the ball hitting time corresponding feature point if, at the sampling time t, a value of min(α
∥
Xt−
Xinit∥
+β
∥
Tt−
Tinit∥
) is smaller than a predetermined ball hitting time corresponding feature point threshold, wherein α and
β
are predetermined parameters, Xt is a position corresponding to the sampling time t, Xinit is a position corresponding to an original time to of the motion, Tt is a stance corresponding to the sampling time t, and Tinit is a stance corresponding to the original time to of the motion; andrecognizing the ball hitting time corresponding feature point if, at the sampling time, an acceleration change rate is larger than a predetermined ball hitting time acceleration change rate threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for ball game motion recognition, comprising:
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a parameter obtaining unit to obtain motion parameters at sampling time for a motion; a feature point extracting unit to extract feature points according to predetermined feature point recognition tactics utilizing the motion parameters, wherein the feature point recognition tactics comprises recognition tactics of at least three types of the feature points;
power-assisting path early stage corresponding feature point, motion top point corresponding feature point, and ball hitting time corresponding feature point; anda motion recognizing unit to recognize the motion as a predetermined ball game type if the feature points extracted satisfy feature point requirements of the predetermined ball game type; wherein the recognition tactics of the power-assisting path early stage corresponding feature point comprise;
both ratios of velocity in the first dimension to velocity in the other two dimensions being larger than a predetermined power-assisting path early stage corresponding feature point ratio;the recognition tactics of the motion top point corresponding feature point comprises;
velocity in a second dimension being smaller than a predetermined motion top point corresponding feature point velocity threshold; andthe recognition tactics of the ball hitting time corresponding feature point comprises; recognizing the ball hitting time corresponding feature point if, at the sampling time t, a value of min(α
∥
Xt−
Xinit∥
+β
∥
Tt−
Tinit∥
) is smaller than a predetermined ball hitting time corresponding feature point threshold, wherein α and
β
are predetermined parameters, Xt is a position corresponding to the sampling time t, Xinit is a position corresponding to an original time to of the motion, Tt is a stance corresponding to the sampling time t, and Tinit is a stance corresponding to the original time to of the motion; andrecognizing the ball hitting time corresponding feature point if, at the sampling time, an acceleration change rate is larger than a predetermined ball hitting time acceleration change rate threshold. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification