Fig. 1. Schematic diagram of point coordinate measurement of circular structured light system

Fig. 2. Small hole imaging model

Fig. 3. Schematic diagram of measurement error analysis of circular structured light systems

Fig. 4. Schematic diagram of circular structured light system roundness measurement. (a) Before rigid body transformation; (b) After rigid body transformation

Fig. 5. Schematic diagram of grid search algorithm

Fig. 6. Schematic diagram of system calibration

Fig. 7. Circular structure light fitting results

Fig. 8. Roundness measurement experiment of circular structured light system

Fig. 9. Images of the halo taken during the experiment

Fig. 10. Results of halo center point extraction

Fig. 11. 3D point cloud of the inner surface to be measured

Fig. 12. Roundness assessment points for 5 sections