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tessedit_char_whitelist does not work with OEM 1 (LSTM engine) and causes empty/erratic output. This was the root cause of Tesseract returning empty text despite clear, well-preprocessed images. Character filtering is already handled post-OCR by the VIN validator's correct_ocr_errors() method (I->1, O->0, Q->0, etc). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>