26 June 2017 Power estimation of martial arts movement using 3D motion capture camera
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Proceedings Volume 10335, Digital Optical Technologies 2017; 103351T (2017) https://doi.org/10.1117/12.2270135
Event: SPIE Digital Optical Technologies, 2017, Munich, Germany
Abstract
Motion capture camera (MOCAP) has been widely used in many areas such as biomechanics, physiology, animation, arts, etc. This project is done by approaching physics mechanics and the extended of MOCAP application through sports. Most researchers will use a force plate, but this will only can measure the force of impact, but for us, we are keen to observe the kinematics of the movement. Martial arts is one of the sports that uses more than one part of the human body. For this project, martial art ‘Silat’ was chosen because of its wide practice in Malaysia. 2 performers have been selected, one of them has an experienced in ‘Silat’ practice and another one have no experience at all so that we can compare the energy and force generated by the performers. Every performer will generate a punching with same posture which in this project, two types of punching move were selected. Before the measuring start, a calibration has been done so the software knows the area covered by the camera and reduce the error when analyze by using the T stick that have been pasted with a marker. A punching bag with mass 60 kg was hung on an iron bar as a target. The use of this punching bag is to determine the impact force of a performer when they punch. This punching bag also will be stuck with the optical marker so we can observe the movement after impact. 8 cameras have been used and placed with 2 cameras at every side of the wall with different angle in a rectangular room 270 ft2 and the camera covered approximately 50 ft2. We covered only a small area so less noise will be detected and make the measurement more accurate. A Marker has been pasted on the limb of the entire hand that we want to observe and measure. A passive marker used in this project has a characteristic to reflect the infrared that being generated by the camera. The infrared will reflected to the camera sensor so the marker position can be detected and show in software. The used of many cameras is to increase the precision and improve the accuracy of the marker. Performer movement was recorded and analyzed using software Cortex motion analysis where velocity and acceleration of a performer movement can be measured. With classical mechanics approach we have estimated the power and force of impact and shows that an experienced performer produces more power and force of impact is higher than the inexperienced performer.
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Nur Zaidi Azraai, Ahmad Afiq Sabqi Awang Soh, Mohd Zubir Mat Jafri, "Power estimation of martial arts movement using 3D motion capture camera", Proc. SPIE 10335, Digital Optical Technologies 2017, 103351T (26 June 2017); doi: 10.1117/12.2270135; https://doi.org/10.1117/12.2270135
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