Many years ago there was specific OCR software (SpotlightPro / RasterDesk) for vectorize scanned technical drawings to CAD formats (with dimension lines, text labels, etc.); now there is Scan2CAD[0]. All them are proprietary software.
Sadly I can't find any open-source vectorizer & OCR for repair scanned technical drawings, and Tesseract has a lot of issues with rotated text labels specific to CAD.[1]
Sadly I can't find any open-source vectorizer & OCR for repair scanned technical drawings, and Tesseract has a lot of issues with rotated text labels specific to CAD.[1]
[0] https://alternativeto.net/software/scan2cad/
[1] https://groups.google.com/g/tesseract-ocr/c/t-2Ru9h4xSc