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Smart Structures and Systems
  Volume 20, Number 5, November 2017 , pages 563-572

Vision-based multipoint measurement systems for structural in-plane and out-of-plane movements including twisting rotation
Jong-Han Lee, Chi-Young Jung, Eunsoo Choi and Jin-Hwan Cheung

    The safety of structures is closely associated with the structural out-of-plane behavior. In particular, long and slender beam structures have been increasingly used in the design and construction. Therefore, an evaluation of the lateral and torsional behavior of a structure is important for the safety of the structure during construction as well as under service conditions. The current contact measurement method using displacement meters cannot measure independent movements directly and also requires caution when installing the displacement meters. Therefore, in this study, a vision-based system was used to measure the in-plane and out-of-plane displacements of a structure. The image processing algorithm was based on reference objects, including multiple targets in Lab color space. The captured targets were synchronized using a load indicator connected wirelessly to a data logger system in the server. A laboratory beam test was to compare the displacements and rotation obtained from the proposed vision-based measurement system with those from the current measurement method using string potentiometers. The test results that the proposed vision-based measurement system could be applied successfully and easily to evaluating both the in-plane and out-of-plane movements of a beam including twisting rotation.
Key Words
    vision; displacement; in-plane; out-of-plane; twisting
Jong-Han Lee: Department of Civil Engineering, Daegu University, Gyeongsan 38453, Republic of Korea
Chi-Young Jung: Seismic Simulation Test Center, Pusan National University, Yangsan 50612, Republic of Korea
Eunsoo Choi: Department of Civil Engineering, Hongik University, Seoul 04066, Republic of Korea
Jin-Hwan Cheung: Department of Civil Engineering, Pusan National University, Busan 46241, Republic of Korea

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