Incheon National University researchers find solution for reliable excavator tracking in real-world construction environments
Researchers develop an automated, reliable-based multi-camera strategy applicable to simultaneous occlusion scenarios in dynamic construction environments
image: Occlusion is a major challenge in dynamic construction environments where frequent obstructions significantly degrade object tracking performance. To overcome this challenge, researchers have proposed an automated multi-camera strategy that quantitatively evaluates tracking reliability and selects the most reliable camera during simultaneous occlusion events.
Credit: Professor Choongwan Koo, Division of Architecture & Urban Design, Incheon National University, Republic of Korea
Despite significant advances in vision-based equipment tracking, frequent occlusions caused by multiple interacting machines continue to degrade tracking accuracy on construction sites. While previous studies have explored multi-camera approaches, they often assume that at least one camera maintains a clear view at all times. In practice, however, such conditions are rarely guaranteed. Even with multiple CCTV systems installed, simultaneous occlusions across cameras frequently occur, making it difficult to identify which camera provides the most reliable view at any given moment.
To fill this knowledge gap, a research team led by Professor Choongwan Koo from the Division of Architecture & Urban Design at Incheon National University, Republic of Korea, has recently proposed an automated, reliability-based multi-camera strategy for excavator tracking. This study was made available online on 9 October 2025, and have been published in Volume 181 of Automation in Construction on 1 January 2026.
According to Prof. Koo, “The primary practical contribution of this study is the development of a quantitative and automated framework for selecting the most reliable camera under simultaneous occlusion conditions in real-world construction environments.”
The proposed approach introduces a quantitative reliability framework based on occlusion regions (e.g., arm and body) and occlusion ratios. Unlike conventional methods that primarily focus on improving detection or tracking algorithms, this strategy enables direct assessment of tracking reliability at the frame level. Notably, this study identifies critical occlusion thresholds—0.7 for the excavator arm and 0.5 for the body—beyond which tracking performance significantly deteriorates. These thresholds offer clear and actionable criteria for practitioners to assess the quality of vision-based monitoring data.
Beyond methodological contributions, the proposed strategy also offers significant practical and economic benefits. By improving the continuity and accuracy of tracking results, the approach enhances the reliability of equipment operation logs, which are essential for carbon emission estimation and regulatory reporting. This, in turn, can help reduce administrative burdens and financial risks, such as penalties or revalidation costs. Furthermore, by leveraging existing camera infrastructure and evaluating reliability in real time, the proposed approach minimizes the need for additional camera installations, thereby reducing capital expenditure and avoiding complications related to power supply, networking, and site constraints. The automated camera selection process also reduces reliance on manual intervention, leading to lower labor and operational costs.
“Overall, our work provides a practical and scalable solution to improve the reliability and field applicability of vision-based construction monitoring systems, with potential extensions to productivity analysis, activity recognition, and carbon emission monitoring,” concludes Prof. Koo.
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Reference
DOI: 10.1016/j.autcon.2025.106589
About Incheon National University
Incheon National University (INU) is a comprehensive, student-focused university. It was founded in 1979 and given university status in 1988. One of the largest universities in South Korea, it houses nearly 14,000 students and 500 faculty members. In 2010, INU merged with Incheon City College to expand capacity and open more curricula. With its commitment to academic excellence and an unrelenting devotion to innovative research, INU offers its students real-world internship experiences. INU not only focuses on studying and learning but also strives to provide a supportive environment for students to follow their passion, grow, and, as their slogan says, be INspired.
Website: https://www.inu.ac.kr/sites/inuengl/index.do?epTicket=LOG
About Professor Choongwan Koo
Professor Choongwan Koo obtained his Ph.D. degree in the field of Sustainable Construction Engineering and Management from Yonsei University in 2014 and has a good mix of academic and industrial experiences. He has also worked as an Assistant Professor at the Department of Building Services Engineering, The Hong Kong Polytechnic University in 2016–2018. His research is focused on the field of smart construction management and intelligent facility management with a transformative and innovative strategy towards enhancing construction safety, for example, vision-based safe working environments, VR-based construction safety training, workers’ heat stress management, and carbon neutrality in construction. He is currently focusing on smart construction management and intelligent facility management as a director of research projects funded by government agencies such as the National Research Foundation (RS-2026-25473695, RS-2023-00217322).