Hi,
When I was scanning Official Guides to DVD, I used an 8.5" x 14" flat bed scanner. I got a good one on ebay (as I recall) for about $150 (factory certified - usually new return to factory and the final production testing done on the product to make sure nothing is wrong - they can not sell it as new since it was returned to the factory) about 10 years ago.
I've taken larger documents to what was called "Atlanta Blue Print" and later became "Atlanta Digital Imaging" for larger documents up to 30" wide. When I tried to find someone a few years ago, the widest was 24".
I have also taken a document that was large (Landscape - 8,5x14) and scanned the pieces into different files and merged them in Windows Paint.
Scanning pieces only needs to make sure the edges of the document to be scanned were square on the flatbed scanner and leave enough overlap between scans so overlaying one on the other works (no gaps). Little gaps scanned separately seem to be worse to line up than rescanning the next larger piece to get the overlap - fewer items to line up.
As for OCR (Optical Character Recognition), it is not worth the effort. I stay with the JPG or type it in manually. Others may have had better luck with OCR.
Just my experience.
Doug vV
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