Edge Detect
Detect edges using Sobel, Prewitt, Laplacian, or Laplacian-of-Gaussian (LoG) operators. Equivalent to gwy_data_field_filter_sobel / gwy_data_field_filter_laplacian.
Inputs
| Name |
Type |
Required |
Description |
| field |
DATA_FIELD |
Yes |
Input field |
Outputs
| Name |
Type |
Description |
| edges |
DATA_FIELD |
Edge-detected output field |
Controls
| Name |
Type |
Default |
Description |
| method |
dropdown |
sobel |
Edge detection operator: sobel, prewitt, laplacian, or log (Laplacian of Gaussian) |
| sigma |
FLOAT |
1.0 |
Gaussian smoothing sigma used only for the LoG operator (0.1–10.0) |
Limitations
- sigma is ignored for sobel, prewitt, and laplacian methods.
- Sobel and Prewitt return gradient magnitude; Laplacian and LoG return signed second-derivative values.
