Tesseract - An Open Source OCR Engine.

The tesseract extension contains the tesseract program, plus Greenstone plugins to use it during build.

You can get the Tesseract extension in two ways:

1. Checkout the tar ball, and unpack it.

  cd greenstone3/gs2build/ext
  wget https://svn.greenstone.org/gs2-extensions/tesseract/trunk/tesseract-linux-x64.tar.gz
  tar xzvf tesseract-linux-x64.tar.gz

  You will need to open a new terminal and source gs3-setup.sh to have the extensions environment variables set.
  
2. Checkout the src, and compile it up.

  cd greenstone3/gs2build/ext
  svn co https://svn.greenstone.org/gs2-extensions/tesseract/trunk/src tesseract
  cd tesseract
  ./CASCADE-MAKE.sh


******************
TesseractPlugins
******************

The tesseract extension comes with two plugins: TesseractTextExtractor and TesseractImagePlugin.
TesseractTextExtractor is a helper plugin that will run Tesseract on an image, producing a text file.
TesseractImagePlugin can replaceImagePlugin, adding Tesseract OCR ability to it.

TODO: Implement TesseractPagedImagePlugin.