Fig. 1. Optical system diagram of confocal fundus camera

Fig. 2. Relationship diagram between galvanometer synchronization signal and scanning velocity signal

Fig. 3. Comparison effect between misaligned and aligned images. (a) Aligned image; (b) misaligned image

Fig. 4. Schematic diagram of the template image and target image matching process

Fig. 5. Flow chart of image misalignment correction algorithm based on normalized sum of squared difference

Fig. 6. Correction results of misalignment in reconstructed images of concentric ring targets. (a) Uncorrected image; (b) corrected image; (c) grayscale data separation results for even and odd rows in Fig. 6(a); (d) grayscale data extraction results for even and odd rows in the red line section of Fig. 6(a); (e) grayscale data extraction results for even and odd rows in the red line section of Fig. 6(b); (f) grayscale difference curve for even and odd rows in the red line section of Fig. 6(a); (g) grayscale difference curve for even and odd rows in the red line section of Fig. 6(b)

Fig. 7. Relationship between ∆X_i and N_SSD in the misalignment correction of a single reconstructed image

Fig. 8. Relationship between the number of iterations for different targets in real-time calibration and ∆t_k

Fig. 9. Relationship between the number of iterations for different targets in real-time calibration and T_WP

Fig. 10. Reconstructed images of different targets with varying iteration numbers during real-time