GIGO "Garbage in, garbage out. "
George Fuechsel, an early IBM programmer and instructor coined the phrase to explain that a computer merely processes what it's given. The quality of output is determined by the quality of input. OCR or Optical Character Recognition software can't create something from nothing.
Short of tedious manual redrawing by a skilled human, I don't see much salvage potential here. Sorry.
Nancy O'Shea, Product User & Community Expert
Alt-Web Design & Publishing ~ Web : Print : Graphics : Media