| Title |
Vision-Based Dynamic Motion Measurement of a Floating Structure Using Multiple Targets under Wave Loadings |
| Authors |
이진학(Yi, Jin-Hak) ; 김진하(Kim, Jin-Ha) ; 정원무(Jeong, Weon-Mu) ; 채장원(Chae, Jang-Won) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.1A.019 |
| Keywords |
영상 기반 동적변위 계측;임계값 결정;부유체 vision-based dynamic motion measurement;selection of threshold value;global positioning system;motion reference unit(MRU);floating structures;RTK-GPS |
| Abstract |
Recently, vision-based dynamic deflection measurement techniques have significant interests and are getting more popular owing to development of the high-quality and low-price camcorder and also image processing algorithm. However, there are still several research issues to be improved including the self-vibration of vision device, i.e. camcorder, and the image processing algorithm in device aspect, and also the application area should be extended to measure three dimensional movement of floating structures in application aspect. In this study, vision-based dynamic motion measurement technique using multiple targets is proposed to measure three dimensional dynamic motion of floating structures. And also a new scheme to select threshold value to discriminate the background from the raw image containing targets. The proposed method is applied to measure the dynamic motion of large concrete floating quay in open sea area under several wave conditions, and the results are compared with the measurement results from conventional RTK-GPS(Real Time Kinematics-Global Positioning System) and MRU(Motion Reference Unit). |