Threshold Mask
Create a binary mask by thresholding data. Otsu automatically finds the optimal threshold. Equivalent to Gwyddion's threshold and otsu_threshold modules.
Inputs
| Name |
Type |
Required |
Description |
| field |
DATA_FIELD |
Yes |
Input field to threshold |
Outputs
| Name |
Type |
Description |
| mask |
IMAGE |
Binary mask (white = selected pixels) |
| threshold |
RECORD_TABLE |
Table with the threshold value applied |
Controls
| Name |
Type |
Default |
Description |
| method |
dropdown |
absolute |
Thresholding method: absolute (raw data value), relative (fraction of min–max range), or otsu (automatic Otsu threshold) |
| threshold |
FLOAT |
0.0 |
Threshold value; for absolute: raw z value; for relative: fraction 0–1; ignored for otsu (socket-only input) |
| direction |
dropdown |
above |
Which pixels to select: above or below the threshold |
Limitations
- For the relative method, the threshold fraction is applied to the full data range [min, max].
- Otsu thresholding may not give meaningful results on non-bimodal height distributions.
