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motovaultpro/ocr/app/preprocessors
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Eric Gullickson 0de34983bb
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fix: use best-contrast color channel for VIN preprocessing (refs #113) 
White text on green VIN stickers has only ~12% contrast in standard
grayscale conversion because the green channel dominates luminance.
The new _best_contrast_channel method evaluates each RGB channel's
standard deviation and selects the one with highest contrast, giving
~2x improvement for green-tinted VIN stickers. Falls back to standard
grayscale for neutral-colored images.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-06 21:14:56 -06:00
..
__init__.py
feat: add owner's manual OCR pipeline (refs #71)
2026-02-01 21:30:20 -06:00
pdf_preprocessor.py
feat: add owner's manual OCR pipeline (refs #71)
2026-02-01 21:30:20 -06:00
receipt_preprocessor.py
feat: add receipt OCR pipeline (refs #69)
2026-02-01 20:43:30 -06:00
vin_preprocessor.py
fix: use best-contrast color channel for VIN preprocessing (refs #113)
2026-02-06 21:14:56 -06:00