This project "SmartDeblur" is nearly 9 years old, but it works miracles for recovering text. github.com/Y-Vladimir/SmartDeb

It's a standalone Windows-or-OSX-app in Qt with a clunky UI.

The code is AGPL; I am unclear if there are any patents involved on the algorithms. But the author did publish a lot of background material on his personal site, which may preclude some claims on it being all trade-secrety. If anybody felt like re-implementing it.

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@n8 Wiener deconvolution is pretty standard, and is provided by e.g. the scikit-image package for Python. I agree it would be useful to have it as a graphical app, though.

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