Techno Press
Techno Press

Smart Structures and Systems   Volume 13, Number 6, June 2014, pages 927-942
DOI: http://dx.doi.org/10.12989/sss.2014.13.6.927
 
Vision-based remote 6-DOF structural displacement monitoring system using a unique marker
Haemin Jeon, Youngjae Kim, Donghwa Lee and Hyun Myung

 
Abstract     [Full Text]
    Structural displacement is an important indicator for assessing structural safety. For structural displacement monitoring, vision-based displacement measurement systems have been widely developed; however, most systems estimate only 1 or 2-DOF translational displacement. To monitor the 6-DOF structural displacement with high accuracy, a vision-based displacement measurement system with a uniquely designed marker is proposed in this paper. The system is composed of a uniquely designed marker and a camera with a zooming capability, and relative translational and rotational displacement between the marker and the camera is estimated by finding a homography transformation. The novel marker is designed to make the system robust to measurement noise based on a sensitivity analysis of the conventional marker and it has been verified through Monte Carlo simulation results. The performance of the displacement estimation has been verified through two kinds of experimental tests; using a shaking table and a motorized stage. The results show that the system estimates the structural 6-DOF displacement, especially the translational displacement in Z-axis, with high accuracy in real time and is robust to measurement noise.
 
Key Words
    structural health monitoring (SHM); 6-DOF displacement; vision; unique marker
 
Address
Haemin Jeon, Donghwa Lee and Hyun Myung: Department of Civil and Environmental Engineering, KAIST, Daejeon 305-701, Republic of Korea
Youngjae Kim and Hyun Myung: Robotics Program, KAIST, Daejeon 305-701, Republic of Korea
 

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