Ask HN: Form generator / parser from pdf or image

I've just filled in on paper a printed passport application, and it got me wondering: isn't there anywhere a piece of software that would be able to parse a pdf or image, guess where somebody would input text and generate a form (maybe an web form)? A bit of google found a number of tools, but they're simply write text on a background, none seem to be able even to center cursor in the text box.

If I have enough time I'm tempted to play a bit with this even though it's not really my domain, but I'd like to hear if anybody has seen something like this before.