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This should be pretty trivial with OpenCV etc.
Unfortunately, nothing in computer vision's ever as trivial as you might imagine, or as it should be.
But, but... square detection!
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No kidding? What's working?
Full writeup coming soon! (I'll comment here with a link, in case it doesn't make front-page.) Getting the lines is not the hard part, but rather, reasoning about the regions enclosed by them to find the panels. I'm not totally satisfied with my current solution (it's a bit hacky), so I'll try to tweak it a bit, but in any case, results will be posted soon.
also, i wonder what his UI works like? i bet you can do this in two clicks of a human per comic.