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adding more nodes

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matei jordache
2026-04-03 23:11:52 -07:00
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# Perspective Correction
Fix perspective distortion in a DATA_FIELD via a projective (homography) transform. Each corner can be shifted by a fractional offset to map a distorted quadrilateral back to a rectangle. Equivalent to Gwyddion's `correct_perspective.c` module.
## Inputs
| Name | Type | Required | Description |
|------|------|----------|-------------|
| field | DATA_FIELD | Yes | Input field with perspective distortion |
## Outputs
| Name | Type | Description |
|------|------|-------------|
| corrected | DATA_FIELD | Perspective-corrected field |
## Controls
| Name | Type | Default | Description |
|------|------|---------|-------------|
| top_left_x | FLOAT | 0.0 | Horizontal offset of the top-left corner as a fraction of image width (-0.5–0.5) |
| top_left_y | FLOAT | 0.0 | Vertical offset of the top-left corner as a fraction of image height (-0.5–0.5) |
| top_right_x | FLOAT | 0.0 | Horizontal offset of the top-right corner as a fraction of image width (-0.5–0.5) |
| top_right_y | FLOAT | 0.0 | Vertical offset of the top-right corner as a fraction of image height (-0.5–0.5) |
| bottom_left_x | FLOAT | 0.0 | Horizontal offset of the bottom-left corner as a fraction of image width (-0.5–0.5) |
| bottom_left_y | FLOAT | 0.0 | Vertical offset of the bottom-left corner as a fraction of image height (-0.5–0.5) |
| bottom_right_x | FLOAT | 0.0 | Horizontal offset of the bottom-right corner as a fraction of image width (-0.5–0.5) |
| bottom_right_y | FLOAT | 0.0 | Vertical offset of the bottom-right corner as a fraction of image height (-0.5–0.5) |
## Notes
- All offsets are given as fractions of the image dimensions (0.0 = no shift, 0.1 = 10% shift). Positive x shifts right, positive y shifts down.
- The transform uses bilinear interpolation to resample pixel values at non-integer locations.
- For trapezoidal distortions (common in tilted AFM scans), typically only two corners need adjustment.
- Set all offsets to 0.0 to pass the field through unchanged.