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Developer(s) Thomas Breuel, DFKI
Initial release 9 April 2007[1]
Preview release 0.4.3 (alpha) / 2009-07-1; 146075698 ago
Written in C++ and Lua
Operating system Linux, Mac OS X
Type Optical character recognition
License Apache License v2.0
Website http://code.google.com/p/ocropus/

OCRopus is a free document analysis and optical character recognition system released under the Apache License, Version 2.0 with a very modular design through the use of plugins. These plugins allow OCRopus to swap out components easily.

OCRopus is currently developed under the lead of Thomas Breuel from the German Research Centre for Artificial Intelligence in Kaiserslautern, Germany and is sponsored by Google.

OCRopus is developed for Linux; however, users have reported success with OCRopus on Mac OS X and an application called TakOCR[2] has been developed that installs OCRopus on Mac OS X and provides a simple droplet interface.


How it works

OCRopus is an OCR system that combines pluggable layout analysis, pluggable character recognition, and pluggable language modeling. It aims primarily for high-volume document conversion, namely for Google Book Search, but also for desktop and office use or for vision impaired people.

OCRopus used Tesseract as its only character recognition plugin, but it uses its own engine in the 0.4 release.[3] This is especially useful in expanding functionality to include additional languages and writing systems. OCRopus also contains disabled code for a handwriting recognition engine which may be repaired in the future.

OCRopus's layout analysis plugin does image preprocessing and layout analysis: it chops up the scanned document and passes the sections to a character recognition plugin for line-by-line or character-by-character recognition.

As of the alpha release, OCRopus uses the language modeling code from another Google-supported project, OpenFST[4], optional as of version pre-0.4.


Release history:[5]

  • Initial announcement - 9 April 2007[6]
  • 0.1.0 (alpha) - 22 Oct 2007
  • 0.1.1 (alpha) 14 Dec 2007 - Improved build system
  • 0.2 (alpha 2) - 31 May 2008
  • 0.3 (alpha 3)- 16 Oct 2008.[5]
  • pre-0.4 (alpha 4) available for download May 2009[7]
  • 0.4.3 July 2009
  • Updated Roadmap


Currently OCRopus can only be used from the command line. Once installed, it can be invoked by specifying the input images. It will output hOCR (HTML-based) code to standard out. If more precise control is needed, options can be specified on the command line to perform specific operations (e.g. recognizing a single line).

See also


External links


fr:OCRopus it:OCRopus ru:OCRopus uk:OCRopus

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