Review and prospect of digital-image-based crack detection of structure surface
Liu Yufei1,2 Fan Jiansheng1,2 Nie Jianguo1,2 Kong Siyu1 Qi Yu1
1. School of Civil Engineering, Tsinghua University, Beijing 100084, China;
2. Key Laboratory of Civil Engineering Safety and Durability of the Ministry of Education, Tsinghua University, Beijing 100084, China
Abstract：Cracks reflecting the stress state, safety and durability of structures are one of the important indicators for on-site safety inspection, monitoring of concrete structures and experimental research of structural model. The existing manual crack detection technology may not meet the needs of engineering projects and laboratories, due to its disadvantages such as inaccurate measurement, too much work at height, low efficiency, and incomplete records. In comparison, the use of digital image method to identify structural surface cracks has the benefits of convenience, automation, quantification and high accuracy. This paper provides a systematic review on the researches of structural surface crack detection by digital image method, and analyzes and discusses those commonly-used algorithms involved in important procedures of crack detection including image preprocessing, crack detection and extraction, and calculation of crack parameters. The principle and process of using multi-view geometric 3D reconstruction methods to realize crack imaging correction and stitching, and crack expression output are discussed. Based on actual bridge cases, the study and application of crack detection using the UAV platform are reported. The relevant regulations for crack detection in the exposure draft of “Technical specification for digital image inspection of engineering structures”, as the first domestic digital image method inspection specification, are introduced. Finally, the prospect of the research on the detection of structural surface defects by digital image method is discussed.
刘宇飞 樊健生 聂建国 孔思宇 齐玉. 结构表面裂缝数字图像法识别研究综述与前景展望[J]. 土木工程学报, 2021, 54(6): 79-98.
Liu Yufei Fan Jiansheng Nie Jianguo Kong Siyu Qi Yu. Review and prospect of digital-image-based crack detection of structure surface. 土木工程学报, 2021, 54(6): 79-98.
