I don't think it's the general quality of the patent print that's poor, it's the line-printer listing section from https://www.hp9845.net/9845/downloads/patents/US4089059.pdf starting at about page 213 of the pdf , possibly section 26 of the patent.
The print in that section is much paler than the rest - typical of a worn line-printer ribbon. I doubt the printed copy is any better. I'm only trying to OCR the listing, not the rest of the patent. On Wed, Dec 3, 2025 at 2:42 PM Paul Koning via cctalk <[email protected]> wrote: > > > > On Nov 30, 2025, at 14:19, Adrian Godwin <[email protected]> wrote: > > > > No, it's a scanned listing from a patent. I think it's on the Australian > ho museum site. But that does make me wonder if preprocessing the input > image files would be faster than postprocessing the text output files. > > If the scan you have is not very good, an option would be to contact the > patent office for a copy. It may well be a copy direct from their archives > is cleaner than what you have now. > > paul
