Results 11 to 20 of about 830,564 (185)
Serve Ball Trajectory Characteristics of Different Volleyballs and Their Causes
Proceedings, 2020 Volleyball is a sport that starts with a serve, so effective service is essential to win the game. The trajectory of the ball is complicatedly affected by the fluid force, which depends on the speed, spin speed, and panel shape.
Takehiro Tamaru +2 more
doaj +2 more sources
Measurements of the Flight Trajectory of a Spinning Soccer Ball and the Magnus Force Acting on It
Proceedings, 2020 The trajectory of a soccer ball, kicked with a spin to curve it into the goal, is strongly influenced by aerodynamic factors such as the Magnus force. Several studies using a wind-tunnel and high-speed cameras have investigated the Magnus force acting on
Takeshi Asai +6 more
doaj +3 more sources
Automatic Golf Ball Trajectory Reconstruction and Visualization [PDF]
, 2009 The article presents the steps required to reconstruct a 3D trajectory of a golf ball flight, bounces and roll in short game. Two video cameras were used to capture the last parts of the trajectories including the bounces and roll. Each video sequence is processed and the ball is detected and tracked until is stops.
Zupančič, Tadej, Jaklič, Aleš
core +5 more sources
Ball Tracking Based on Multiscale Feature Enhancement and Cooperative Trajectory Matching
Applied SciencesMost existing object tracking research focuses on pedestrians and autonomous driving while ignoring sports scenes. When general object tracking models are used for ball tracking, there are often problems, such as detection omissions due to small object ...
Xiao Han, Qi Wang, Yongbin Wang
doaj +2 more sources
Tracking the soccer ball using multiple fixed cameras [PDF]
, 2009 This paper demonstrates innovative techniques for estimating the trajectory of a soccer ball from multiple fixed cameras. Since the ball is nearly always moving and frequently occluded, its size and shape appearance varies over time and between cameras ...
Jones, G. +3 more
core +4 more sources
Generating ball trajectory in soccer video sequences [PDF]
, 2006 This paper demonstrates innovative techniques for estimating the trajectory of a soccer ball, using fixed cameras with constant calibration parameters.
Orwell, James +4 more
core +3 more sources
Keeping your eyes continuously on the ball while running for catchable and uncatchable fly balls. [PDF]
PLoS ONE, 2014 When faced with a fly ball approaching along the sagittal plane, fielders need information for the control of their running to the interception location.
Dees B W Postma +2 more
doaj +1 more source
Study on the influence of grinding disc motion on the forming of silicon nitride ceramic balls
Jin'gangshi yu moliao moju gongcheng, 2023 In order to improve the processing accuracy of silicon nitride ceramic balls and to investigate the mechanism of forming ceramic balls by flexible support grinding method, a new cone-type flexible support grinding method with controlled deflection motion
Ziqiang GE +5 more
doaj +3 more sources
Serve Ball Trajectory Characteristics of Different Volleyballs and Their Causes
Applied Sciences, 2021 A floater serve in volleyball is a technique of serving a non-rotating or low-rotating ball, which is difficult to return because the flight path of the ball changes irregularly.
Takehiro Tamaru +2 more
doaj +1 more source
Frontiers in Sports and Active Living, 2022 In real hockey or soccer games, scoring opportunities usually occur quite rarely, and thus, for most of the duration of a game, the ball is drifting between the two goals.
Takayasu Mizawa +2 more
doaj +1 more source