I wonder if you could use Adobe Photoshop’s image deblurring techniques to get the private key?
Kevin Lepeska

I tried some stuff with Photoshop, using sharpening techniques and then some sort of rasterising to get more data out of that blur, but I think even if you are really good at it, a lot of data is lost and you need to brute force a lot of combinations because a lot of blocks cannot be said for certain.

sharpening blurred screenshot
after some more processing, try to map it to a raster

After comparing it with the real QR it was, in the left part I already had a lot of missed blocks. Maybe a bit more information was available within the blur, but I’m not sure.

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