Figure 6
From: Deformable part models for object detection in medical images
Different kinds of connection between layers cause different kinds of restrictions. (a) Single-connected nodes allow for independent rotation around the nodes. (b) Double-connected nodes can be used to enforce approximate orthogonality or parallelism (this example) between sub-shapes. (c) Connecting further nodes of the sub-shape with the structural layer enforces co-deformation, such as, e.g., curvedness of the sub-shape (left sub-shape in 6.c) or its size (right sub-shape in 6.c).