Optical Character Recognition -- typically the art of teaching a computer to read printed text (provided as scanned images).

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Three principal open-source engines:
   * [http://jocr.sf.net/%|%GOCR] (appears to have a Tcl/Tk frontend)
   * [http://www.gnu.org/software/ocrad/ocrad.html%|%Ocrad] (GNU)
   * [http://sf.net/projects/tesseract-ocr%|%Tesseract OCR] (originally Hewlett-Packard, but now released as open source)

Recommended proprietary packages:
   * [http://www.vividata.com/index.html%|%Vividata OCR Shop XTR Lite]
   * [http://www.hamrick.com/%|%VueScan ]

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