Line Correction
Correct scan-line mismatches using Gwyddion-derived row alignment methods. Supports median and trimmed row alignment, difference-based alignment, polynomial row leveling, and step-line correction from Gwyddion's linecorrect/linematch modules.
Inputs
| Name |
Type |
Required |
Description |
| field |
DATA_FIELD |
Yes |
Input field with scan-line artifacts |
| mask |
IMAGE |
No |
Binary mask to include or exclude regions during correction |
Outputs
| Name |
Type |
Description |
| corrected |
DATA_FIELD |
Field with scan-line offsets removed |
| background |
DATA_FIELD |
Estimated per-line background that was subtracted |
| row_shifts |
LINE |
Per-row shift values applied during correction |
Controls
| Name |
Type |
Default |
Description |
| method |
dropdown |
median |
Alignment method: median, median_diff, trimmed_mean, trimmed_diff, polynomial, or step |
| direction |
dropdown |
horizontal |
Direction of scan lines to correct: horizontal or vertical |
| masking |
dropdown |
ignore |
How to use the mask: ignore, include (correct using masked rows only), or exclude |
| trim_fraction |
FLOAT |
0.05 |
Fraction of extreme values to trim; visible only for trimmed_mean and trimmed_diff methods (0–0.5) |
| polynomial_degree |
INT |
1 |
Polynomial degree for the polynomial method (0–5); visible only for polynomial method |
Notes
- The step method is designed for step-like scan artifacts and may over-correct smooth surfaces.
- Mask shape must match the field shape if a mask is connected.
