Fig 1.
Feature fusion structure diagram.
Fig 2.
Running process of improved YOLOv4-Tiny.
Fig 3.
Training steps of the improved YOLOv4-Tiny.
Fig 4.
Flowchart of SPM-GRU model operation.
Fig 5.
Data expansion diagram of PM-GRU model.
Fig 6.
Improved GRU prediction unit structure diagram.
Fig 7.
Loss variation curves of three models.
Fig 8.
Average accuracy of different models.
Fig 9.
Comparison of detection accuracy of table tennis balls using different models.
Table 1.
Comparison of different models on different evaluation indicators.
Fig 10.
Comparison between three algorithms for predicting trajectories and real trajectories.
Fig 11.
Comparison of errors on the coordinate axis.
Table 2.
Prediction accuracy and prediction time of different models.