[1] Zheng J K, Shao S. Analysis of flange connection sealing for crude oil pipelines and material selection of gaskets[J]. Polyester Industry, 36, 35-37(2023).

[2] Li S Q. Comparative analysis of bolt flange connection design methods and summary of domestic research status[J]. Mechanical & Electrical Engineering Technology, 50, 16-20(2021).

[3] Yang M. Analysis of leakage causes of flange connection gasket seal in pressure vessels[J]. Chemical Equipment Technology, 40, 42-44(2019).

[4] Shi F Y, Zheng X J, Jiang L H et al. Point cloud registration algorithm for non-cooperative targets based on Hough transform[J]. Journal of Beijing University of Aeronautics and Astronautics, 49, 2071-2078(2023).

[5] Tian B B, Liu Y M, Ding L. Multiple inspection object detection algorithm based on Hough transform[J]. Laser & Optoelectronics Progress, 61, 2037016(2024).

[6] Liu H T, Cui H H, Li P C et al. Accurate detection method for robustness of reference holes in aerospace assembly[J]. Acta Optica Sinica, 43, 0312001(2023).

[7] Prasad D K, Leung M K H, Cho S Y. Edge curvature and convexity based ellipse detection method[J]. Pattern Recognition, 45, 3204-3221(2012).

[8] Mei B, Zhu W D, Yan G R et al. A new elliptic contour extraction method for reference hole detection in robotic drilling[J]. Pattern Analysis and Applications, 18, 695-712(2015).

[9] Dong W B, Roy P, Peng C et al. Ellipse R-CNN: learning to infer elliptical object from clustering and occlusion[J]. IEEE Transactions on Image Processing, 30, 2193-2206(2021).

[10] Haas T, Schubert C, Eickhoff M et al. BubCNN: Bubble detection using faster RCNN and shape regression network[J]. Chemical Engineering Science, 216, 115467(2020).

[11] Fornaciari M, Prati A, Cucchiara R. A fast and effective ellipse detector for embedded vision applications[J]. Pattern Recognition, 47, 3693-3708(2014).

[12] Jia Q, Fan X, Luo Z X et al. A fast ellipse detector using projective invariant pruning[J]. IEEE Transactions on Image Processing, 26, 3665-3679(2017).

[13] Meng C, Li Z X, Bai X Z et al. Arc adjacency matrix-based fast ellipse detection[J]. IEEE Transactions on Image Processing, 29, 4406-4420(2020).

[14] Bochkovskiy A, Wang C Y, Liao H Y M. YOLOv4: optimal speed and accuracy of object detection[EB/OL]. https://arxiv.org/abs/2004.10934v1

[15] Xiao Z J, Yang Y Y, Kong X X. Object detection method based on improved YOLOv4 network for remote sensing images[J]. Laser & Optoelectronics Progress, 60, 0628009(2023).

[16] Vassiliou P J. Contact geometry of curves[J]. Symmetry, Integrability and Geometry: Methods and Applications, 3, 43-44(2009).

[17] Rosin P L. Techniques for assessing polygonal approximations of curves[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 19, 659-666(1997).

[18] Prasad D K, Quek C, Leung M K H et al. A parameter independent line fitting method[C], 441-445(2011).

[19] Fitzgibbon A, Pilu M, Fisher R B. Direct least square fitting of ellipses[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 21, 476-480(1999).

[20] Prasad D K, Leung M K H. Clustering of ellipses based on their distinctiveness: an aid to ellipse detection algorithms[C], 292-297(2010).

[21] Pătrăucean V, Gurdjos P, von Gioi R G. A parameterless line segment and elliptical arc detector with enhanced ellipse fitting[M]. Computer vision-ECCV 2012, 7573, 572-585(2012).

[22] Wei Z Z, Zhao Z, Zhang G J. Solution of duality in pose estimation of single circle using Euclidean angular constraint[J]. Optics and Precision Engineering, 18, 685-691(2010).