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In the process of table tennis man-machine sparring, the ball will rotate when it collides with the racket/table, which will cause the sphere to deviate due to the influence of the Magnus force. Therefore, it is difficult to meet the requirements of accurate trajectory prediction of table tennis robot. Trajectory prediction and rotation measurement technology can help improve the robot's ability of prediction and striking. In order to help researchers in this field understand the research methods and existing technologies of table tennis trajectory prediction and rotation measurement, the new developments in the research of table tennis trajectory prediction and rotation measurement are reviewed. After reclassifying and sorting out the research results based on the research achievements in this field in recent years, the advantages and disadvantages of different methods are analyzed and the key issues are sorted out. Finally, the future research trend of table tennis trajectory prediction and rotation measurement is prospected. [ABSTRACT FROM AUTHOR]

The freely rising rule and Magnus force of different wooden balls rising in the static liquid were investigated using computer image processing technology and visual experiments. The results show that both the vertical and horizontal velocities of different wooden balls reach stable maximums in a short time after the wooden balls begin to rise, then the wooden balls keep rising with this maximum. The value of Magnus force is calculated by measuring the vertical and horizontal and spinning angle velocities of the wooden balls at the stable stage. [ABSTRACT FROM AUTHOR]