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