Illustration of the inter-layer pairwise and branch correspondence.

(A)(B) illustrated examples of the projection overlap-based method; (C) 2–3 vectorized contours of the carburetor; (D) correspondence of the 2–3 contours of the carburetor using our method; (E) 34–35 vectorized contours of the carburetor; (F) correspondence of the 34–35 contours of the carburetor using our method; (G) 43–44 vectorized contours of the hub; (H) correspondence of the 43–44 contours of the hub using our method; (I) 33–34 vectorized contours of the hub; (J) 33–34 stacked contours of hub; (K)(L) false correspondence by minimum spanning tree; (M)(N) correspondence of the 33–34 contours of hub using our method.