A method and device for detecting internal defects of pipelines using stereoscopic visual imaging

Through stereoscopic vision imaging technology and three-dimensional model reconstruction, the problem of difficulty in detecting internal defects in underground pipelines in the existing technology is solved, and accurate defect positioning and display are achieved.

CN113487490BActive Publication Date: 2025-03-18SHENZHEN YIXIN INTELLIGENT VISION TECH CO LTD
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Patent Information

Application Number
CN202110567491.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-05-24
Publication Date
2025-03-18
Estimated Expiration
2041-05-24

AI Technical Summary

Technical Problem

The prior art is difficult to detect defects inside underground pipelines quickly, efficiently and accurately, resulting in difficult time discovering and solving pipeline aging and corrosion problems.

Method used

Using stereoscopic vision imaging technology, depth images are collected through binocular cameras, keyframe images are selected for initial construction of a three-dimensional model. Combined with point cloud data fitting and cylindrical fitting, defect locations inside the pipeline are positioned, and defect features are displayed through three-dimensional model reconstruction.

Benefits of technology

It realizes the rapid construction of a three-dimensional model inside the pipeline, accurately locates and identifys defects inside the pipeline, provides detailed information on defects inside the pipeline, and supports users to quickly find the location of the defects in the pipeline.

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Abstract

The present invention relates to the technical field of engineering monitoring, and in particular to a method and device for detecting internal defects of a pipeline by stereoscopic visual imaging. The method comprises the following steps: obtaining a depth image of the interior of a pipeline to be detected; determining an initial frame image in the depth image, and selecting a key frame image located after a time series of the initial frame image according to a preset angle condition and / or mileage condition; constructing a three-dimensional model of the interior of the pipeline to be detected; extracting point cloud data from all the depth images, performing cylinder fitting and segmentation processing on all the point cloud data, and determining a cylinder segment of a non-cylindrical surface according to a preset cylinder determination threshold; bringing the position information and image information of the defect target into the three-dimensional model for reconstruction to obtain a three-dimensional model with defect information. The method can quickly construct an internal model of a pipeline with defect information.
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