Remote control of multiple high speed camera for ball trajectory determination
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Date
2017-06
Authors
Chan Teng Cing
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Abstract
This thesis is concerned with determination the trajectory of table tennis ball in real world and solving of initial value problems of ordinary differential equations (ODE). The behaviour of ball’s trajectory is influenced by air resistance, gravitational force, ball rotation and its velocity. There are two approaches to determine the ball trajectory launched by ball throwing machine. Firstly, the ball trajectory is modelled numerically. Next, a set of image processing technique is proposed to track the ball moving in projectile and extracts its maximum position, initial velocity and initial angle of inclination. The solenoid remote control is used to trigger the high speed camera in image acquisition experiment. The trajectory of the ball is determined from the ball motion characteristic. Multiple cameras are used to harness different characteristic of moving ball. One of the camera are filming the ball as it is moving in projectile motion to get the overall successive position of ball. Another camera which is zoomed in is used to capture the rotation of ball during its flight. Comparative analyses of these two approaches are discussed by plotting the trajectory of table tennis ball numerically. It is found that the speed reduction for ball under no spin are ranged from 0.74% to 2.22%. While the ball launched with top spin has speed reduction ranged from 36.29% to 45.46%. The final position of ball in direction of x axis at -0.4m height are as follow, no spin: 1.684m, top spin: 1.047m and back spin: 2.532m.