ACF 2D
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.
Inputs
| Name |
Type |
Required |
Description |
| field |
DATA_FIELD |
Yes |
Input height field |
Outputs
| Name |
Type |
Description |
| acf |
DATA_FIELD |
2D autocorrelation field centered on zero shift |
Controls
| Name |
Type |
Default |
Description |
| level |
dropdown |
mean |
Pre-processing applied before correlation: mean subtraction, plane subtraction, or none |
Notes
- Output is not normalized to [−1, 1]; peak value equals the field variance.
- Plane levelling assumes a linear trend; strongly curved surfaces may not detrend correctly.
