Table 1.
Correspondence between the chain code value of eight neighborhood and the boundary coordinates (x, y).
| x offset | y offset | The value of chain code |
|---|---|---|
| 1 | 0 | 0 |
| 1 | 1 | 1 |
| 0 | 1 | 2 |
| −1 | 1 | 3 |
| −1 | 0 | 4 |
| −1 | −1 | 5 |
| 0 | −1 | 6 |
| 1 | −1 | 7 |
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