Libera

Libera is a gem built for Charon - https://github.com/NEU-Libraries/charon - a digital humanities focused Samvera head.

It's purpose is to take PDF files as input, and split them apart into individual page images for OCR and TEI generation.

Installation

There are some programs that are required for Libera to work;

Tesseract 3.03 and ImageMagick 6.7.7-10 were the versions used in the development of this gem.

Both should be available through package managers such as APT, Yum, Homebrew etc.

Add this line to your application's Gemfile:

gem 'libera'

And then execute:

$ bundle

Or install it yourself as:

$ gem install libera

Usage

To use this gem at the command-line:

libera -p ./input.pdf

There are several adjustable parameters;

  • -p | --pdf_location (no default)
  • -w | --working_directory (default is a unique directory made in the directory you run libera)
  • -d | --density (default is 300)
  • -q | --quality (default is 100)
  • -f | --format_type (default is PNG)
  • -h | --help

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/NEU-Libraries/libera.

License

The gem is available as open source under the terms of the MIT License.