I am trying to find a way to scan a “paper document” with my scanner and then, trying with a programming language, like C# or C++, to figure out what letters are printed on the page to convert them to normal text.
In other words, I am trying to implement a “key from scanned image” function in order to convert a paper document to an electronic document to be opened with something like Notepad. Can anyone give me some tips, please?
It sounds like you’re trying to do is something like OCR, or Optical Character Recognition. It’s certainly not a simple field of study, but this wiki page should get you started with the concepts and what it is:
https://en.wikipedia.org/wiki/Optical_character_recognition