Fig. 1. RCF model structure

Fig. 2. Improved RCF model structure

Fig. 3. Feature fusion

Fig. 4. Multi-receptive field module

Fig. 5. Efficient attention mechanism module

Fig. 6. Anti-aliasing for maximum pooling

Fig. 7. One-dimensional anti-aliasing operation

Fig. 8. Data samples

Fig. 9. Relationship between the loss and the number of iterations in the conventional RCF algorithm

Fig. 10. Relationship between the loss and the number of iterations in the improved RCF algorithm

Fig. 11. Edge detection results for small-angle liquid droplet

Fig. 12. Edge detection results for large-angle liquid droplet