Fig. 1. Diagram of second order differences

Fig. 2. Diagram of neighborhood faces of vertices and faces

Fig. 3. Diagram of finding approximate faces

Fig. 4. The vertex adjustment process before improvement

Fig. 5. Flowchart of mesh sharpening

Fig. 6. Improved sharpening process

Fig. 7. Effect of sharpening

Fig. 8. Model scanning process

Fig. 9. Sharpening of mesh models with noise

Fig. 10. Sharpening of models with rounded corners

Fig. 11. Comparison of sharpening methods before and after improvement

Fig. 12. Sharpening of mesh models with different densities

Fig. 13. Sharpening of cube mesh model

Fig. 14. Sharpening of foundation mesh model

Fig. 15. Sharpening of mesh models with different noise

Fig. 16. Sharpening of threaded mesh models with different levels of density