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High-precision Measurement of Joint between Shield Tunnel Segments Based
on SegFormer Model
(1. CCCC Second Harbor Engineering Company Ltd., Wuhan 430040; 2. R&D Center for Intelligent Manufacturing Technology of Transportation Infrastructure in Transportation Industry, Wuhan 430040; 3. Wuhan University, Wuhan 430000)
Abstract In order to efficiently and precisely measure shield tunnel segment erection joint, the segment joint seg?
mentation algorithm based on the SegFormer model is created, the grey space distribution information of segment joints is extracted, crude coding of image features is improved to fine coding, and the fine local features are captured while the global distribution information of segment joint is maintained, so as to enhance the robustness and accuracy of the algorithm. According to the study, the segment joint segmentation algorithm based on the SegFormer model has a measurement accuracy of 2~3 pixels. In order to widely apply the segment joint measurement algorithm, the hardware solution that combines smartphone, laser ranging and double-side supplementary lighting is proposed, so that the algorithm is deployed on a cloud server and the segment joint can be quickly measured on site by using the APP. According to comparison with manual measurement results, the photograph of segment joint shot within 5 m by a mobile phone with 10X optical zoom has physical accuracy of <0.5 mm, which is enough to meet the segment joint measurement standard.
Abstract：
In order to efficiently and precisely measure shield tunnel segment erection joint, the segment joint seg?
mentation algorithm based on the SegFormer model is created, the grey space distribution information of segment joints is extracted, crude coding of image features is improved to fine coding, and the fine local features are captured while the global distribution information of segment joint is maintained, so as to enhance the robustness and accuracy of the algorithm. According to the study, the segment joint segmentation algorithm based on the SegFormer model has a measurement accuracy of 2~3 pixels. In order to widely apply the segment joint measurement algorithm, the hardware solution that combines smartphone, laser ranging and double-side supplementary lighting is proposed, so that the algorithm is deployed on a cloud server and the segment joint can be quickly measured on site by using the APP. According to comparison with manual measurement results, the photograph of segment joint shot within 5 m by a mobile phone with 10X optical zoom has physical accuracy of <0.5 mm, which is enough to meet the segment joint measurement standard.
YANG Zhao1,
2 GAO Ruchao1,
2 JI Fuquan1 etc
.High-precision Measurement of Joint between Shield Tunnel Segments Based
on SegFormer Model[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(6): 175-182
2023, Vol. 60 