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2024 Vol.26, Issue 6 Preview Page

Research Paper

Field evaluation of image distortion in mobile tunnel scanning system

이동식 터널 스캐닝 시스템의 영상 이미지 왜곡에 대한 현장 성능 평가

Chulhee Lee1
,
Dongku Kim1
,
Donggyou Kim2*
이 철희1
,
김 동구1
,
김 동규2*
1Senior Researcher, Dept. of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology
2Senior Research Fellow, Dept. of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology
1정회원, 한국건설기술연구원 지반연구본부 수석연구원
2정회원, 한국건설기술연구원 지반연구본부 선임연구위원
*Corresponding Author
30 November 2024. pp. 647-660
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Abstract

In this study, we proposed a method to evaluate the performance of a mobile tunnel scanning system, focusing on the impact of registration precision and distortion of video images during automated tunnel inspection. A field experiment was conducted to evaluate the distortion of video images taken at a speed of 80 km/h with markers attached to the concrete lining of a road tunnel. In the manually captured reference image, the root mean square error (RMSE) for the marker position was found to be 9.78 mm, and the horizontal distance RMSE was 0.13%, and the vertical distance RMSE showed low distortion performance of 0.11%. However, in the image taken at a speed of 80 km/h, severe distortion occurred, with the horizontal distance RMSE being 41.17% and the vertical distance RMSE being 34.38%. The distortion of these images is believed to be caused by high-speed shooting and inadequate correction for tunnel curvature. The proposed on-site performance evaluation method is expected to be of great help not only in objective performance evaluation but also in identifying improvements to ensure the precision of mobile tunnel scanning systems.

Keywords
Mobile tunnel scanning system
Image distortion
Precision
Field experiment
RMSE (root mean square error)

본 연구에서는 터널 자동화 점검 시 영상 이미지의 정합 정밀도와 왜곡의 영향에 중점을 두고 이동식 터널 스캐닝 시스템의 성능을 평가하는 방안을 제안하였다. 도로 터널의 콘크리트 라이닝에 마커를 부착한 상태에서 80 km/h의 속도로 촬영한 영상 이미지의 왜곡을 평가하기 위해 현장 실험을 수행하였다. 수동으로 촬영한 참조 이미지에서 마커 위치에 대한 RMSE (root mean square error)는 9.78 mm로 나타났으며, 수평 거리 RMSE는 0.13%, 수직 거리 RMSE는 0.11%의 낮은 왜곡 성능을 보였다. 그러나 80 km/h의 속도로 촬영한 영상에서는 수평 거리 RMSE가 41.17%, 수직 거리 RMSE가 34.38%로 심한 왜곡이 발생한 것으로 나타났다. 이러한 이미지의 왜곡은 고속 촬영과 터널 곡률에 대한 부적절한 보정으로 기인된 것으로 추정된다. 제안된 현장 성능 평가 방법은 객관적인 성능 평가뿐만 아니라, 이동식 터널 스캐닝 시스템의 정밀도를 확보하기 위한 개선 사항들을 파악하는 것에도 큰 도움이 될 것으로 기대된다.

키워드
이동식 터널 스캐닝 시스템
이미지 왜곡
정밀도
현장실험
RMSE (root mean square error)
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 26
  • No :6
  • Pages :647-660
  • Received Date : 2024-10-24
  • Revised Date : 2024-10-31
  • Accepted Date : 2024-10-31
  • DOI :https://doi.org/10.9711/KTAJ.2024.26.6.647
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