Research Article
Retinal Image Matching Using Hierarchical Vascular Features
Table 1
The invariant features for vessel segments in the nodes of a tree model.
| Nodes | Invariant features | L/W | Bi/Br | Crossover | Cross pos. | Acute angle |
| 1 | 88.77 | 1 | 0 | 0 | 0.877 | 2 | 18.27 | 0 | 0 | 0 | 1.126 | 3 | 43.12 | 0 | 0 | 0 | 0 | 4 | 34.27 | 1 | 1 | 0.79 | 0.788 | 5 | 53.42 | 1 | 0 | 0 | 0.689 |
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