Mark Disconnected
Mark topologically disconnected (isolated) surface regions. A morphological opening followed by closing builds a smooth defect-free reference surface; pixels whose deviation from that reference exceeds the sensitivity threshold are flagged. Equivalent to Gwyddion's mark_disconn.c module.
Inputs
| Name |
Type |
Required |
Description |
| field |
DATA_FIELD |
Yes |
Input surface to analyse for disconnected regions |
Outputs
| Name |
Type |
Description |
| mask |
IMAGE |
Binary mask (0/255) marking detected disconnected regions |
Controls
| Name |
Type |
Default |
Description |
| defect_type |
dropdown |
positive |
Which direction of outliers to detect: positive (bumps), negative (pits), or both |
| radius |
INT |
5 |
Morphological filter radius in pixels (1--100). Larger values smooth over bigger features |
| threshold |
FLOAT |
0.1 |
Sensitivity threshold as a fraction of the max residual range (0.001--1.0). Lower values detect smaller defects |
Notes
- The algorithm applies grey-scale morphological opening then closing with a disk structuring element to produce a defect-free reference. The difference between the original surface and this reference highlights isolated regions.
- Increase the radius to ignore larger surface features and only flag truly disconnected regions.
- Lower the threshold to catch subtler defects; raise it to reduce false positives.
- The resulting mask can be fed to Laplace Interpolation or Fractal Interpolation to fill the detected regions.
