Analysis Technology of Tennis Sports Match Based on Data Mining and Image Feature Retrieval

Table 9

Statistical table of the angle between the racket and the ground at the moment of hitting the ball (unit: °).

	A	B	C	D	E	Average value
Flat strike	70.46	71.46	71.83	67.40	60.43	68.32
Top spin	55.37	59.24	54.28	57.96	49.92	55.36
Difference	15.09	12.22	17.55	9.43	10.50	12.96