Fig. 1. Information cross-linking diagram of helicopter rotor axis trajectory visual measurement system based on UAV platform

Fig. 2. Schematic diagram of layout of coded survey signs and viewing angle of UAV shooting

Fig. 3. Meter-shaped calibration frame

Fig. 4. Schematic diagram of high-precision measurement of single-camera dense points based on right-angle ruler

Fig. 5. Implementation process of camera real-time dynamic external parameter calibration

Fig. 6. Display of axis trajectory measurement results of helicopter rotor axis simulation turntable

Fig. 7. Axial center trajectory measurement results of helicopter