SensusAccess can convert image-only PDF files, JPG pictures, Microsoft PowerPoint presentations, and LaTeX projects into more accessible formats. It can also convert standard documents into audio, e-books, digital Braille, large print, and BeeLine Reader formats. If you have a scanned PDF that a screen reader cannot process, SensusAccess is a good first step toward making it readable. SensusAccess
Keep in mind that conversions work best with clean, clearly scanned documents. Poor quality documents that are marked up, very grainy, or scanned crookedly will most likely result in poor quality conversions.