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Root cause: Tesseract fragments VINs into multiple words but candidate extraction required continuous 17-char sequences, rejecting all results. Changes: - Fix candidate extraction to concatenate adjacent OCR fragments - Disable Tesseract dictionaries (VINs are not dictionary words) - Set OEM 1 (LSTM engine) for better accuracy - Add PSM 11 (sparse text) and PSM 13 (raw line) fallback modes - Add Otsu's thresholding as alternative preprocessing pipeline - Upscale small images to meet Tesseract's 300 DPI requirement - Remove incorrect B->8 and S->5 transliterations (valid VIN chars) - Fix pre-existing test bug in check digit expected value Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
12 KiB
12 KiB