Template Match
Find a template pattern within a larger data field using normalised cross-correlation. The score output shows match quality (1 = perfect match). Equivalent to Gwyddion maskcor.c.
Inputs
| Name |
Type |
Required |
Description |
| image |
DATA_FIELD |
Yes |
Larger field to search in |
| template |
DATA_FIELD |
Yes |
Smaller template pattern to find |
Outputs
| Name |
Type |
Description |
| score |
DATA_FIELD |
Normalized cross-correlation score map |
| detections |
IMAGE |
Binary mask marking positions above the threshold |
Controls
| Name |
Type |
Default |
Description |
| threshold |
FLOAT |
0.8 |
Minimum correlation score to mark as a detection (0.0–1.0) |
Limitations
- The template must be smaller than the image; equal or larger sizes are not supported.
- Normalized cross-correlation assumes uniform background; strong global gradients reduce detection accuracy.
