"Maybe some image pre-processing would be needed?" No, a whole lot of pre-processing would be needed. It all depends on the exact layout - if your tolerances a

"Maybe some image pre-processing would be needed?" No, a whole lot of pre-processing would be needed. It all depends on the exact layout - if your tolerances are tight you need much more logic than if you have, let's say, 2cm white space around one sentence you're after.