Proceedings of the Korean Society of Broadcast Engineers Conference (한국방송∙미디어공학회:학술대회논문집)
- 2009.01a
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- Pages.768-772
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- 2009
MEASUREMENT OF THREE-DIMENSIONAL TRAJECTORIES OF BUBBLES AROUND A SWIMMER USING STEREO HIGH-SPEED CAMERA
- Nomura, Tsuyoshi (Graduate School of Information Science Nara Institute of Science and Technology) ;
- Ikeda, Sei (Graduate School of Information Science Nara Institute of Science and Technology) ;
- Imura, Masataka (Graduate School of Information Science Nara Institute of Science and Technology) ;
- Manabe, Yoshitsugu (Graduate School of Information Science Nara Institute of Science and Technology) ;
- Chihara, Kunihiro (Graduate School of Information Science Nara Institute of Science and Technology)
- Published : 2009.01.12
Abstract
This paper proposes a method for measurement three-dimensional trajectories of bubbles generated around a swimmer's arms from stereo high-speed camera videos. This method is based on two techniques: two-dimensional trajectory estimation in single-camera images and trajectory pair matching in stereo-camera images. The two-dimensional trajectory is estimated by block matching using similarity of bubble shape and probability of bubble displacement. The trajectory matching is achieved by a consistensy test using epipolar constraint in multiple frames. The experimental results in two-dimensional trajectory estimation showed the estimation accuracy of 47% solely by the general optical flow estimation, whereas 71% taking the bubble displacement into consideration. This concludes bubble displacement is an efficient aspect in this estimation. In three-dimensional trajectory estimation, bubbles were visually captured moving along the flow generated by an arm; which means an efficient material for swimmers to swim faster.
Keywords
- Scientific Training for Swimming;
- Stereo High-speed Camera;
- Three-Dimensional Trajectories of Bubbles;
- Optical Flow Estimation