Fig 1.
Internal thread pipe.
Fig 2.
Flow chart of internal thread defect detection.
Fig 3.
Parallel light shines on the thread.
Fig 4.
Visual system model and how it works.
Fig 5.
Fisheye lens field of view model.
Fig 6.
Working mode diagram.
Table 1.
Performance comparison analysis of defect detection algorithms.
Fig 7.
Training and deployment process.
Fig 8.
Visual system photo.
Fig 9.
Visual system improvements.
Fig 10.
Tube with female threads.
Fig 11.
Internal thread image distortion correction results.
Fig 12.
Internal thread image enhancement results.
Fig 13.
Internal thread image cropping results.
Fig 14.
Panoramic stitching results of internal thread images.
Table 2.
Comparison table of filter algorithm parameters.
Fig 15.
Comparison chart of image stitching effects.
Table 3.
Comparison of training parameters for YOLO v8, YOLOv5, and SSD.
Fig 16.
Internal thread defect detection results.
Fig 17.
Defect detection results after internal thread image stitching.