Fig. 1. Image deformation effect with different transformation matrices of MLS. (a) Original image; (b) affine deformation; (c) similarity deformation; (d) rigid deformation

Fig. 2. Schematic of MLS mapping based on area control

Fig. 3. Flowchart of distortion correction based on MLS

Fig. 4. Image distortion acquisition step

Fig. 5. Control point position selection image

Fig. 6. Correction principle image based on MLS distortion

Fig. 7. Conceptual diagram of three-spline interpolation method

Fig. 8. Experimental system image

Fig. 9. Comparison images before and after sharpness adjustment. (a) Before adjustment; (b) after adjustment

Fig. 10. Camera-collected distortion integer map and maximum error map for each side

Fig. 11. Reverse distortion image after correction

Fig. 12. Experimental correction result acquisition image

Fig. 13. Comparison of error before and after correction for each side. (a) Side A; (b) side B; (c) side C; (d) side D

Fig. 14. Distortion maps for each side of the projected image in the depth of field. (a) Side A; (b) side B; (c) side C; (d) side D

Fig. 15. Correction maps for each side of the projected image in the depth of field. (a) Side A; (b) side B; (c) side C; (d) side D