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\section{Literature review} Review}  \label{sec:lit_rev}  Optical character recognition has long been of interest in the computer industry. In 1976, Ray Kurzweil presented in \cite{schantz1982history} an omni-font OCR engine, that together with a speech synthesiser would read texts to blind people. It came together with its own special scanner, that was required for taking the images of pages.