Polynomial Level
Fit and subtract a polynomial background of given degree in x and y. Equivalent to gwy_data_field_fit_polynom.
Inputs
| Name |
Type |
Required |
Description |
| field |
DATA_FIELD |
Yes |
Input field to level |
Outputs
| Name |
Type |
Description |
| leveled |
DATA_FIELD |
Field with polynomial background subtracted |
| background |
DATA_FIELD |
The fitted polynomial background surface |
Controls
| Name |
Type |
Default |
Description |
| degree_x |
INT |
2 |
Polynomial degree in the x direction (0–5) |
| degree_y |
INT |
2 |
Polynomial degree in the y direction (0–5) |
Limitations
- High polynomial degrees (> 4) may overfit and introduce artificial long-range modulation.
- No masking support; all pixels contribute equally to the fit.
