27 lines
883 B
Markdown
27 lines
883 B
Markdown
# ACF 2D
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Compute the two-dimensional autocorrelation function with Gwyddion-style mean or plane levelling before correlation. The output is centered on zero shift and uses default half-range extents.
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## Inputs
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| Name | Type | Required | Description |
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|------|------|----------|-------------|
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| field | DATA_FIELD | Yes | Input height field |
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## Outputs
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| Name | Type | Description |
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|------|------|-------------|
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| acf | DATA_FIELD | 2D autocorrelation field centered on zero shift |
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## Controls
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| Name | Type | Default | Description |
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|------|------|---------|-------------|
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| level | dropdown | mean | Pre-processing applied before correlation: mean subtraction, plane subtraction, or none |
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## Notes
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- Output is not normalized to [-1, 1]; peak value equals the field variance.
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- Plane levelling assumes a linear trend; strongly curved surfaces may not detrend correctly.
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