Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Evaluating the Accuracy of an OpenCV-Based Length Measurement Algorithm: The Impact of Checkerboard Type and Capturing Conditions

체커보드 종류 및 촬영조건에 따른 OpenCV 기반 길이측정 알고리즘 정확도 분석

  • Kim, Hyeonmin (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kwon, Woobin (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kim, Harim (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kim, Hyungjun (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Song, Seung Ho (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Cho, Hunhee (School of Civil, Environmental and Architectural Engineering, Korea University)
  • Received : 2023.11.17
  • Accepted : 2023.12.04
  • Published : 2024.02.20
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Abstract

The OpenCV-based length measurement algorithm is anticipated to be effective for length measurement inspection tasks, providing objective inspection outcomes. Nonetheless, there is a notable gap in research regarding the influence of various checkerboard types and capturing conditions on the algorithm's accuracy in real-world construction settings. Consequently, this study proposes a methodology employing an OpenCV-based length measurement algorithm and checkerboard for digital construction inspection tasks. The findings suggest that using a checkerboard with square sizes of A4 or larger, and 50mm or larger, is optimal for capturing distances and angles within 4m and 90°, respectively, when deploying the algorithm. These insights are anticipated to provide practical guidelines for professionals conducting digital-based length measurement inspections.

OpenCV 기반 길이측정 알고리즘은 길이측정 검측업무를 보조함과 동시에 객관적인 검측결과를 제시할 수 있을 것으로 판돤된다, 그러나, 건설현장 내에서 체커보드의 유형과 촬영조건이 해당 알고리즘의 정확도에 어떠한 영향을 미치는지에 대한 연구는 미흡한 실정이다. 이에 본 연구에서는 디지털 기술을 활용한 검측업무 수행에 적합한 체커보드와 촬영방법을 제시하고자 OpenCV 기반 길이측정 알고리즘 정확도 측정 실험을 수행하였다. 실험결과 OpenCV 기반 길이측정 알고리즘을 통한 검측업무 시 촬영거리 4m 이내, 촬영각도 90°의 조건 하, 체커보드 크기와 Square size를 각각 A4 이상, 50mm 이상으로 설정하는 것이 적절할 것으로 판단된다. 본 연구의 결과는 디지털 기술을 통한 길이측정 검측업무 수행 시 가이드라인으로 활용될 수 있을 것으로 사료된다.

Keywords

Acknowledgement

This research was supported by a grant(RS-2022-00143493, project number:1615012983) from Digital-Based Building Construction and Safety Supervision Technology Research Program funded by Ministry of Land, Infrastructure and Transport of Korean Government.

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