Benjamin Admin 09b820efbe refactor(dewarp): replace displacement map with affine shear correction ...

The old displacement-map approach shifted entire rows by a parabolic
profile, creating a circle/barrel distortion. The actual problem is
a linear vertical shear: after deskew aligns horizontal lines, the
vertical column edges are still tilted by ~0.5°.

New approach:
- Detect shear angle from strongest vertical edge slope (not curvature)
- Apply cv2.warpAffine shear to straighten vertical features
- Manual slider: -2.0° to +2.0° in 0.05° steps
- Slider initializes to auto-detected shear angle
- Ground truth question: "Spalten vertikal ausgerichtet?"

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-26 18:23:04 +01:00

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