Fig. 1. Schematic diagram of correction algorithm

Fig. 2. 3×3 side window filter operator

Fig. 3. Improved 3×3 side window filter operator

Fig. 4. Divergence of small target correction parameters（peak position in the figure）

Fig. 5. Flow chart of improved neural network correction algorithm

Fig. 6. Sequence 1 original images

Fig. 7. Comparison of correction effects of different algorithms on sequence 1

Fig. 8. （a）Sequence 1 mean curves；（b）Sequence 1 roughness curves.

Fig. 9. Sequence 2 original images

Fig. 10. Comparison of correction effects of different algorithms on sequence 2

Fig. 11. （a）Sequence 2 mean curves；（b）Sequence 2 roughness curves.

Fig. 12. Sequence 3 original images

Fig. 13. Comparison of correction effects of different algorithms on sequence 3

Fig. 14. （a）Sequence 3 mean curves；（b）Sequence 3 roughness curves.