motovaultpro/ocr/app/preprocessors/vin_preprocessor.py at a07ec324fe01bcf93c00bc4463619d1500c3f466

egullickson/motovaultpro

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Eric Gullickson a07ec324fe

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fix: use min-channel grayscale and morphological cleanup for VIN OCR (refs #113 )

Replace std-based channel selection (which incorrectly picked green for
green-tinted VIN stickers) with per-pixel min(B,G,R). White text stays
255 in all channels while colored backgrounds drop to their weakest
channel value, giving 2x contrast improvement. Add morphological
opening after thresholding to remove noise speckles from car body
surface that were confusing Tesseract's page segmentation.

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

2026-02-06 21:23:43 -06:00

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