Fig. 1. Relationship between the actual and ideal image points

Fig. 2. Functional relationship between k₁ and k₂

Fig. 3. Part of the image in the synthetic dataset

Fig. 4. Structure of AlexNet

Fig. 5. Accuracy of the two algorithms on the test set

Fig. 6. Loss rate of the two algorithms on the test set

Fig. 7. Simulation image. (a) Standard image; (b) distorted image

Fig. 8. RMSE of corner coordinates obtained from 50 random experiments

Fig. 9. Experimental results of real checkerboard images. (a) Distorted image; (b) image corrected by Ref.[4]; (c) image corrected by our method

Fig. 10. RMSE of real chessboard image

Fig. 11. Correction effect of wide-angle lens. (a) Distorted image; (b) image corrected by our method