| In this paper,the variation of batting speed and drop point in ten important matches between HARIMOTO Tomokazu and ITO Mima in the past two years is studied.Firstly,the 3D technique and tactics data in the video are obtained by the reconstruction method of the 3D trajectory of the ball with the monocular vision of table tennis,and the 3D coordinates of the athletes' speed and landing point are extracted.Then the data of 4163 boards were screened and integrated by mathematical statistics,and the instantaneous speed of the ball,the flying speed of the ball,the second jump speed of the ball,the displacement speed and the response time of the ball were obtained respectively.The model of the table tennis field is established and the situation of the players' hitting position is obtained.The falling points in the table are divided into four areas to analyze the players' technical and tactical behavior from the more detailed falling points.The innovation points of this paper are as follows:(1)theoretical contribution: the "fast" of table tennis is quantified into five kinds of speeds,which are the instant speed of hitting the ball,the flying speed of the ball,the second jump speed of the ball,the displacement speed and the response time of hitting the ball(connection speed).At the same time,a large number of speed data(4163 boards)were collected and analyzed on the basis of these data.(2)theoretical contribution: the drop point in the meaning of "quasi" is quantified as the drop point in the course,and the hitting point and drop point are extended as the line.In this paper,in addition to the falling points are divided into near table,middle table and far table,and the table area is divided into the end line area,the sideline area,the near net area and the middle area.(3)the collected technical indicators,the result label of each board and the use of the line are customized,and the area spaned between the hitting point and the falling point is used to distinguish the straight line from the diagonal line.The focus is on the study of the line changes between the boards between zhang benzhihe and ITO meicheng,and a new conclusion is drawn.After empirical research on the competition,the following conclusions are drawn:The two Japanese players belong to the offensive players,the characteristics are close to the table fast attack,speed to win;Backhand push and block(bounce)technology is outstanding,fast,more straight lines,and high scoring rate;And the ability of stalemate is not strong,the use of defense technology,and more points,and most are in a passive state,scoring is basically dependent on the change of the line.HARIMOTO Tomokazu's technical and tactical conclusions:(1)the speed difference between HARIMOTO Tomokazui's and his opponent's is obvious.The speed of backhand bounce has certain advantages in attack,so HARIMOTO Tomokazu's backhand technique is a threat.The second jump speed of HARIMOTO Tomokazu the control technique is relatively fast(the speed of the ball bouncing behind the table),and the second jump speed of the attack technique is relatively slow,which indicates that HARIMOTO Tomokazui the opponent are weak in hand strength and strength quality.The strength and strength of stalemate appear to be less than the opponent,failure more;(2)HARIMOTO Tomokazu serve is relatively single,with more diagonal lines and a certain rule.When the first landing point is #14,#19(the boundary between the left half of the table and the end line),it is inclined to serve the diagonal short ball.When the first landing point is #15,#20(the area between the left half of the table and the end line),it is inclined to serve the straight short ball.(3)from the second board,HARIMOTO Tomokazu began to change the line more,the drop point is tricky,the number of times of changing the straight line is more,the drop point in the sideline area and the end line area is always higher than the opponent,indicating that the drop point is stable,the Angle of the line change is large.Technical and tactical conclusion of ITO Mima:(1)the overall speed of ITO Mima is faster than that of the hand,and more prominent;The speed of connection is also faster than the hand,the hitting point is close to the front;ITO Mima second jump are slower than the hand,it can be explained that ITO Mima's hand is fast,but the strength is insufficient;(2)ITO Mima service line is changeable,the drop point throughout the table,there is no more regular characteristics,or the majority of the diagonal;The second board line changes less,but the drop point is tricky,the third board line becomes flexible,the number of line changes is more,and the drop point is in the end line and the edge area,especially the edge area,the drop point is tricky and steady;(3)the batting technique of ITO Mima has more personal characteristics,has the effect of confusing the opponent;The speed of backhand bounce is not only fast but also steady,so I got a lot of points. |
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