Recently I had to scan a braile text off the kind of a card – the major problem with that is that usually it requires special film, or special lighting to scan it. I got some special software that can OCR the braile, but it has to be already filtered for it. So I took these three simple steps in photoshop to get filtered neat braile out of image scanned by regular scanner.
If there is at least some difference in brightness, you can extract data. I scanned the pits, therefore final image has to be mirrored horizontally. This is the original image:
First thing I did was crop it, and turn up contrast, get these moons (also I cleared up some mess/noise):
Then apply a box blur (for rectangular dots, works better than gaussian):
And apply contrast again, to receive this very OCR-able image:
It was a huge pain to actually find OCR tools for braile fonts. For some reason they charge huge costs for these systems, which seems really impolite to me. The programs I seen are very basic OCR, just with kind-of-FineReader-ish interface.
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