OCR       
noun [ U ]  computing specialized uk/ˌəʊ.siːˈɑːr/ us/ˌoʊ.siːˈɑːr/
 光符识别(optical character recognition的缩写)
abbreviation for optical character recognition: the process by which an electronic device recognizes printed or written letters or numbers
  OCR saves re-keying documents.
 Like many other OCR programs, it is bundled with certain scanner models.
 - More examples
 - It was software that combined traditional faxing, PC faxing and OCR.
 - OCR systems electronically read typewritten text into a word-processing system rather than it having to be keyed in manually.
 - The images have to be converted into text files first, using a scanner's OCR facility.