Applications : Optical Character Recognition, OCR

See also:

• https://github.com/tesseract-ocr/tesseract/wiki Open Source OCR for most OS's.
• http://tiltedtwister.com/sudokudownload.html Amazing recognition of numbers via low resolution scan with light sensor on polar arm and image processing on NXT lego system.
  http://tiltedtwister.com/download/sudoku/sudoku.nxc Source code.
• http://www.simpleocr.com/
• Wikipedia: Optical character recognition