Patent Document ID: 8781610
Application ID: 13269216
Patent Flag: 1

Claim One:
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∥X t −X init ∥+β∥T t −T init ∥) is smaller than a predetermined ball hitting time corresponding feature point threshold, wherein α and β are predetermined parameters, X t is a position corresponding to the sampling time t, X init is a position corresponding to an original time t o of the motion, T t is a stance corresponding to the sampling time t, and T init is a stance corresponding to the original time t o 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.