This overview will not cover commercially available OCR to any great extent, but will instead survey the currently available open-source software and explain how to use it. OCR software as we know it today has been in development since roughly the mid-1980s. Later, in the 1970s, a form of OCR that enabled computers to read texts aloud was developed to assist blind people with reading. The history of OCR goes back to the early decades of the twentieth century when “reading machines” transcribed text into telegraph code, for example. OCR software converts images of typed or printed text into digital text files that can then be manipulated and used for various forms of text mining.
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