31 lines
1.6 KiB
Markdown
31 lines
1.6 KiB
Markdown
# Mark Disconnected
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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.
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## Inputs
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| Name | Type | Required | Description |
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|------|------|----------|-------------|
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| field | DATA_FIELD | Yes | Input surface to analyse for disconnected regions |
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## Outputs
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| Name | Type | Description |
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|------|------|-------------|
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| mask | IMAGE | Binary mask (0/255) marking detected disconnected regions |
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## Controls
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| Name | Type | Default | Description |
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|------|------|---------|-------------|
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| defect_type | dropdown | positive | Which direction of outliers to detect: positive (bumps), negative (pits), or both |
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| radius | INT | 5 | Morphological filter radius in pixels (1--100). Larger values smooth over bigger features |
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| threshold | FLOAT | 0.1 | Sensitivity threshold as a fraction of the max residual range (0.001--1.0). Lower values detect smaller defects |
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## Notes
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- 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.
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- Increase the radius to ignore larger surface features and only flag truly disconnected regions.
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- Lower the threshold to catch subtler defects; raise it to reduce false positives.
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- The resulting mask can be fed to Laplace Interpolation or Fractal Interpolation to fill the detected regions.
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