Fig. 1. Phase shift technology

Fig. 2. Method of Gray code combined with phase shift

Fig. 3. Complementary Gray code method

Fig. 4. Four-piece Gray code mode encoding to obtain fringe levels with different displacements

Fig. 5. Schematic diagram of level hopping error correction

Fig. 6. Experimental reconstruction results of calibration plate

Fig. 7. Fitting error results of standard sphere

Fig. 8. Measurement results of unwrapped phase

Fig. 9. Reconstruction results of different wrapped phases