Grain Edge
Detect grain boundaries from a binary grain mask. Outputs a mask of pixels at grain/non-grain borders using 4-neighbour connectivity. Width controls the boundary thickness in pixels. Equivalent to Gwyddion's grain_edge.c module.
Inputs
| Name |
Type |
Required |
Description |
| field |
DATA_FIELD |
Yes |
Input height field (used for dimension reference) |
| mask |
IMAGE |
Yes |
Binary grain mask (white = grain) |
Outputs
| Name |
Type |
Description |
| edge_mask |
IMAGE |
Binary mask with grain boundary pixels marked |
Controls
| Name |
Type |
Default |
Description |
| width |
INT |
1 |
Boundary thickness in pixels; values greater than 1 dilate the edge outward (1-10) |
Notes
- A grain pixel is on the boundary if at least one of its 4-connected neighbours (up, down, left, right) is not a grain pixel.
- When width > 1, the boundary is expanded using binary dilation with a square structuring element of size (2*width - 1).
- Dilation is masked to stay within the original grain region, so boundaries never extend into non-grain areas.
- The field and mask must have the same pixel dimensions.
