Fig. 1. Vignetting effect in the image

Fig. 2. Vignetting effect decay model

Fig. 3. Relationship between information entropy and distribution movement^［22］

Fig. 4. Logarithmic intensity entropy iterative process

Fig. 5. Images before and after vignetting correction

Fig. 6. Pixel method evaluation of vignetting corrected image

Fig. 7. Results of different vignetting correction methods

Fig. 8. Comparison of vignetting correction metrics evaluation

Fig. 9. Corneal nerve microscope stitching images