Abstract
Urban drainage pipe networks have complex spatial contributions, andthey are now facing problems such as damage, defects, and aging. A rapid and high-precision pipe inspection strategy is thekey to ensuring thesustainable development of urban water supply and drainage system. In this paper, a three-dimensional (3D) reconstruction pipeline of urban drainage pipes based on multiview image matching using low-cost panoramic video cameras is proposed, which provides an innovative technical approach for pipe inspection. Firstly, we extracted frames from the panoramic video of the pipes andcorrected the geometric distortion using a spherical reprojection to obtain multiview pipe images. Second, the robust feature matching method using support lines and affine-invariant ratios isintroduced to conduct pipe image matching. Finally, the photogrammetric processing, using structure from motion (SfM) and dense reconstruction, wasintroduced to achieve the 3D modeling of drainage pipes. Several typical drainage pipes and shafts of the real scenes were taken for the 3D reconstruction experiments. Theresults show that our strategy can realize high-precision 3D reconstruction of different types of pipes, which can provide effective technical support for rapid and efficient inspection of urban pipes with broad application prospects in the daily management of sustainable urban drainage systems (SUDSs).
Highlights
Urban underground pipes are important infrastructures for both water supply and sewage discharge, which arecrucial for urban sustainable development and areclosely related to people’s daily lives
The reprojected image set is taken to photogrammetry processing, photogrammetry processing, such as the multiview image matching, structure from motion (SfM) reconstruction, dense such as the multiview image matching, SfM reconstruction, dense matching, mesh building, and matching, mesh building, and texture mapping sequentially, and, the 3D scene model with texture mapping sequentially, and, the 3D scene model with real pipe texture is obtained
To improve the limitations of pipe inspection using the single lens of circuit televisions (CCTV), this paper proposed a pipe 3D reconstruction method based on spherical panoramic videos, and multiple real scenes including pipes and shafts were carried out for experiments
Summary
Urban underground pipes are important infrastructures for both water supply and sewage discharge, which arecrucial for urban sustainable development and areclosely related to people’s daily lives. With the continuous construction of urban drainage system, the types and structures ofpipes have undergone complex changes. As part of the large volume of underground pipes, drainage pipes have various types, material, sizes, and shapes, and defects in drainage pipes are distributed in a complicated and irregular manner. Internal information of the drainage pipes is very difficult to obtain accurately in most cities, making recognizing and locating internal damage and erosions difficult. More research is needed on the problems of detection and processing of urban pipe defects to realize the sustainable operation and maintenance of urban pipes network with complicated spatial distributions
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