I'm pretty sure that if focus could be corrected through software alone, that feature would have been added to every picture-taking device in the world.
Just noticed that comment scanning an old post, and NVidia just recently showed this exact thing off. It does require a special multi lens camera, and some heavy GPU lifting currently. Still a ways off from consumer level tech, but a fun glimpse at the possible future for photography.
Skip to 2:50 if you just want to see the demo instead of the discussion before it.
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