Hole
around
Trixel
There are a few subtle changes, among the 6000 or so test regions, the following were found to be different. The differences are in that the "AFTER" solution correctly prunes some partial trixels that only graze the border of the region.
ADDED some strange cases for testing, Dec 21st:
| Big Hole around Trixel |
|
|
| Boxed Hole |
 |
 |
Left are "BEFORE" right are "AFTER."
| 43460 |  |
 |
| 44317 |  |
 |
| 47911 |  |
 |
Previous improvements (October 10 2006) : Here