Table 2 Point count before and after preprocessing.

From: Surface and underwater human pose recognition based on temporal 3D point cloud deep learning

Pose

Original quantity

Passthrough filtering

Passthrough-ROR

Passthrough-SOR

Breaststroke

35,172

27,018

19,386

23,084

Butterfly Stroke

36,386

28,755

21,264

24,297

Backstroke

35,629

27,521

20,157

23,186

Freestyle

37,505

29,156

22,405

25,771

Tread Water

18,351

10,917

7745

9418

Drown

13,049

6952

6083

6692