Fig. 1. Flow chart of sag measurement

Fig. 2. Schematic diagram of wire shooting scene

Fig. 3. Selection of transformation vector

Fig. 4. Schematic diagram of sag imaging position

Fig. 5. Schematic diagram of camera captures partial wire

Fig. 6. Determine the imaging position of sag through qN

Fig. 7. IMU calibration

Fig. 8. Semantic segmentation process of wires

Fig. 9. Shape fitting of target wire

Fig. 10. Camera and lens parameters

Fig. 11. Field shooting scenes of wires

Fig. 12. Relative error curve of wire sag measurement