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Just stumbled upon this. I'm not quite sure if it really fits into the "Engines" section, since it's pretty bare-bones. Judging from the README, it's also targeted at natural scene images, but reading through the architecture I don't see any reason why it shouldn't work for printed text as well.
Unfortunately I was unable to find a corresponding paper that could shed more light on the inner workings, but since the repository is pretty fresh (~ 3 weeks at the time of this PR), maybe it's still a work in progress and the publication will follow at some later point.