한국구조물진단유지관리공학회 논문집 (Journal of the Korea institute for structural maintenance and inspection)

  • 제18권6호
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  • Pages.123-130
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  • 2014
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  • 2234-6937(pISSN)
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  • 2287-6979(eISSN)
한국구조물진단유지관리공학회 (Korea Institute for Structural Maintenance Inspection)
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임의의 위치에서 사용 가능한 영상 기반 변위 계측 시스템

Vision-Based Displacement Measurement System Operable at Arbitrary Positions

  • 이준화 (울산과학기술대학교) ;
  • 조수진 (울산과학기술대학교 도시환경공학부) ;
  • 심성한 (울산과학기술대학교 도시환경공학부)
  • 투고 : 2014.05.14
  • 심사 : 2014.07.18
  • 발행 : 2014.11.30
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초록

본 연구에서는 카메라의 위치에 상관없이 정확하게 구조물의 변위를 측정할 수 있는 영상 기반 변위 계측 시스템을 제안하였다. 기존의 영상 기반 변위 계측 시스템은 카메라의 각도에 따라 오차를 유발하며, 그에 따라 대형 구조물에서 적용성에 제한되는 단점이 존재하였다. 본 시스템은 네 개의 점이 그려진 측정판을 변위를 측정하고자 하는 구조물의 위치에 부착하여 카메라로 촬영한 뒤 영상을 해석하여 변위를 얻는다. 측정판과 카메라의 각도에 무관하게 구조물의 변위를 얻기 위하여, 이미지 좌표계와 세계 좌표계 상의 두 평면간의 대응관계를 표현하는 평면 호모그래피 기법을 활용하였다. 성능 검증을 위하여 소형 구조물을 이용한 실내실험을 수행하였으며, 어떠한 각도에서 촬영하더라도 실제 변위를 정확하게 측정할 수 있음을 보였다.

In this study, a vision-based displacement measurement system is developed to accurately measure the displacement of a structure with locating the camera at arbitrary position. The previous vision-based system brings error when the optical axis of a camera has an angle with the measured structure, which limits the applicability at large structures. The developed system measures displacement by processing the images of a target plate that is attached on the measured position of a structure. To measure displacement regardless of the angle between the optical axis of the camera and the target plate, planar homography is employed to match two planes in image and world coordinate systems. To validate the performance of the present system, a laboratory test is carried out using a small 2-story shear building model. The result shows that the present system measures accurate displacement of the structure even with a camera significantly angled with the target plate.

키워드

참고문헌

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피인용 문헌

  1. Development of Structure Dynamic Characteristics Analysis System Prototype using Image Processing Technique vol.16, pp.3, 2016, https://doi.org/10.5392/JKCA.2016.16.03.011
  2. Corrigendum to "Vision-based Displacement Measurement System Operable at Arbitrary Positions" vol.19, pp.1, 2015, https://doi.org/10.11112/jksmi.2015.19.1.001
  3. Displacement Measurement of Steel Pipe Support Using Image Processing Technology vol.8, pp.3, 2014, https://doi.org/10.18178/joig.8.3.80-84