|
Title |
Digital Archiving and Quantitative Assessment of Accident Sites through Smartphone-Based Rapid Imaging
|
|
Authors |
이성진(Sung-Jin Lee) ; 이창길(Changgil Lee) ; 김현기(Hyun-Ki Kim) ; 유용래(Yong-Rae Yu) ; 안호준(Hojune Ann) |
|
DOI |
https://doi.org/10.11112/jksmi.2025.29.6.39 |
|
Keywords |
스마트폰 급속촬영; 디지털 아카이빙; 사고현장 기록; 포인트 클라우드; 정량적 분석; 구조물 변형 Smartphone-based rapid imaging; Digital archiving; Accident site documentation; Point cloud; Quantitative analysis; Structural deformation |
|
Abstract |
When accidents occur in large railway infrastructures such as retaining walls, it is crucial to promptly record and digitally archive initial site conditions. However, in emergencies, deploying high-cost equipment like drones or LiDAR is difficult, and sites are often cleared quickly, leading to loss of key evidence. This study explores a rapid digital archiving method using a general-purpose smartphone. Video captured with a smartphone was processed into 3D point clouds via photogrammetry and used not only for site documentation but also for qualitative deformation identification and quantitative dimension estimation through scale correction. Experiments with tilt and bulging specimens showed that even with sparse data and without absolute scale, deformation occurrence and patterns were visually confirmed, and dimensional changes were measurable after scale correction.
Error analysis indicated that tilt specimens had the largest deviation in height (up to 7.4 cm; MAE 5.1 cm length, 5.8 cm height, 1.0 cm depth, angle:0.75°), while bulging specimens maintained 2?3 cm errors in length and depth with minor variation in height (MAE 3.5 cm). These findings demonstrate that despite limitations, smartphone-based rapid imaging can detect deformation and capture approximate dimensions, offering a practical complementary tool for digital archiving and prompt accident site analysis. Future research should focus on improving data quality through dedicated smartphone applications and conducting comparative validation against high-precision measurement equipment.
|