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

Table 4

Comparison of spatial characteristics at the lowest point of the shoulder joint in racket stage.

	Left shoulder height (m)	Right shoulder height (m)	Height difference between shoulders (m)	The angle between the shoulders and the ground (°)
Flat strike	1.31	1.16	0.15	36.76
Top spin	1.34	1.11	0.23	43.83
Difference	−0.03	0.05	−0.08	−7.07