29 lines
1.0 KiB
Markdown
29 lines
1.0 KiB
Markdown
# Template Match
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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.
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## Inputs
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| Name | Type | Required | Description |
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|------|------|----------|-------------|
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| image | DATA_FIELD | Yes | Larger field to search in |
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| template | DATA_FIELD | Yes | Smaller template pattern to find |
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## Outputs
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| Name | Type | Description |
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|------|------|-------------|
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| score | DATA_FIELD | Normalized cross-correlation score map |
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| detections | IMAGE | Binary mask marking positions above the threshold |
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## Controls
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| Name | Type | Default | Description |
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|------|------|---------|-------------|
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| threshold | FLOAT | 0.8 | Minimum correlation score to mark as a detection (0.0–1.0) |
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## Limitations
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- The template must be smaller than the image; equal or larger sizes are not supported.
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- Normalized cross-correlation assumes uniform background; strong global gradients reduce detection accuracy.
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