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Ruby library for working with the Tesseract OCR.

README.rdoc

rtesseract

Gem Version Build Status Coverage Status

Ruby library for working with the Tesseract OCR.

REQUIREMENTS:

To work properly rtesseract are needed:

  • Tesseract - Program

  • ImageMagick - Program

  • RMagick or mini_magick or quick_magick - Gem

Atention: Version 1.0.0 works fine with Ruby 2.0 and tesseract 3.0 and lower versions of rtesseract works fine with Ruby 1.8 and tesseract 2.0.4.

EXAMPLE USAGE

It's very simple to use rtesseract:

CONVERT IMAGE TO STRING

image = RTesseract.new("my_image.jpg")
image.to_s #Getting the value

CHANGE THE IMAGE

image = RTesseract.new("my_image.jpg")
image.source = "new_image.png"
image.to_s

TRANSFORM THE IMAGE

image = RTesseract.read("my_image.jpg") do |img|
  img = img.white_threshold(245)
  img = img.quantize(256,Magick::GRAYColorspace)
end
image.to_s

CONVERT PARTS OF IMAGE TO STRING

mix_block = RTesseract::Mixed.new("test.jpg") do |image|
  image.area(28,  19, 25, 25)
  image.area(180, 22, 20, 28)
  image.area(218, 22, 24, 28)
  image.area(248, 24, 22, 22)
end
mix_block.to_s

OR

mix_block = RTesseract::Mixed.new("test.jpg",{:areas => [
  {:x => 28,  :y=>19, :width=>25, :height=>25 },
  {:x => 180,  :y=>22, :width=>20, :height=>28},
  {:x => 218,  :y=>22, :width=>24, :height=>28},
  {:x => 248,  :y=>24, :width=>22, :height=>22}
]})
mix_block.to_s

OPTIONS

Processors Options (Rmagick is default)

RTesseract.new("test.jpg", :processor => "mini_magick")

Language Options

RTesseract.new("test.jpg", :lang => "deu")
   * eng   - English
   * deu   - German
   * deu-f - German fraktur
   * fra   - French
   * ita   - Italian
   * nld   - Dutch
   * por   - Portuguese
   * spa   - Spanish
   * vie   - Vietnamese
Note: Make sure you have installed the language to tesseract

Other Options

RTesseract.new("test.jpg", options: :digits)  # Only digit recognition

OR

RTesseract.new("test.jpg", options: [:digits, :quiet])

Contributing to rtesseract

  • Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet.

  • Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it.

  • Fork the project.

  • Start a feature/bugfix branch.

  • Commit and push until you are happy with your contribution.

  • Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.

  • Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

Links

Copyright

Copyright © 2014 Danilo Jeremias da Silva. See LICENSE.txt for further details.

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