Fig. 1. Experimental apparatus

Fig. 2. Distortion schematic diagram

Fig. 3. Four captured distorted fringe-patterns. (a) With phase shift of 0; (b) with phase shift of π/2; (c) with phase shift of π; (d) with phase shift of 3π/2

Fig. 4. Gray value distribution (a) and the instantaneous frequency (b) of the central row of the fringe-pattern

Fig. 5. Radial distorted phase distribution

Fig. 6. Radial distortion distribution according to the recording distance of 13, 16, 19, 22, 25 cm

Fig. 7. Distorted checkerboard image (a) and the calibrated checkerboard image (b)

Fig. 8. Corners image, the red points represent the corners of the distorted checkerboard image, and the blue points represent the corners of the calibrated checkerboard image

Fig. 9. Distorted image of a far-range scene (a) and the calibrated image of the far-range scene (b)

Fig. 10. Distorted image of a close-range scene (a) and the calibrated image of the close-range scene (b)