A simple Ruby Gem to calculate an ROI in an image by indetifying faces using [OpenCV] (http://opencv.org/). This can be used to create optimal crops of images.
Adapted from and inspired by [paperclip-facecrop] (https://github.com/dagi3d/paperclip-facecrop).
Install OpenCV (Mac OSX)
$ sudo port install cmake # in case cmake has not already been installed
$ tar xvzf OpenCV-2.4.0.tar.bz2
$ cd OpenCV-2.4.0
$ mkdir build
$ cd build
$ cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
$ make
$ sudo make install
For other platforms: [Install Guide] (http://docs.opencv.org/doc/tutorials/introduction/table_of_content_introduction/table_of_content_introduction.html)
Install [Ruby OpenCV] (https://github.com/ruby-opencv/ruby-opencv/)
$ gem install ruby-opencv -- --with-opencv-dir=/usr/local
Install face_ROI
Add this line to your application's Gemfile:
gem 'face_ROI'
And then execute:
$ bundle
Or install it yourself as:
$ gem install face_ROI
module FaceROI
OPENCV_BASE= '/usr/local'
endrequire 'face_ROI'
path='test/IMG_0465.jpg'
f=FaceROI::Finder.new(path, FaceROI::CONFIG1)
# In case there were no faces detected it will return the full image
roi_x, roi_y, roi_width, roi_height= f.roi
puts "(#{path}) has ROI?: #{f.has_roi?}"
puts "ROI Offset (#{roi_x}, #{roi_y}), width: #{roi_width}, height #{roi_height}"
# Save image for debugging purposes
image=f.image_with_faces
image.save('test/IMG_0465-with-faces.jpg')From face_ROI/sample_config
# Most optimal configuration, computation intensive, low chances of false positive
CONFIG1= {
:face => %w(haarcascade_frontalface_alt_tree.xml haarcascade_frontalface_alt.xml
haarcascade_profileface.xml).map{|p| File.expand_path(p, HAARCASCADES_BASE)},
:parts => %w(haarcascade_mcs_nose.xml haarcascade_mcs_lefteye.xml
haarcascade_mcs_righteye.xml).map{|p| File.expand_path(p, HAARCASCADES_BASE)},
:padding => [0.6] # top, right (=top), bottom (=top), left (=right); same as CSS
}
# High chances of false positive
CONFIG2= {
:face => %w(haarcascade_frontalface_alt_tree.xml haarcascade_frontalface_alt.xml
haarcascade_profileface.xml).map{|p| File.expand_path(p, HAARCASCADES_BASE)},
:padding => [0.8, 0.8, 0.8, 0.8] # top, right (=top), bottom (=top), left (=right); same as CSS
}
# Simple, high chances of false positive
CONFIG3= {
:face => %w(haarcascade_frontalface_alt_tree.xml).map{|p| File.expand_path(p, HAARCASCADES_BASE)},
:padding => [0.8, 0.8, 0.8, 0.8] # top, right (=top), bottom (=top), left (=right); same as CSS
}Use any of the above, adapt, or create your own configuration.
For padding - just like CSS - 1, 2, 3, or 4 values can be provided.
Also see [paperclip-facecrop] (https://github.com/dagi3d/paperclip-facecrop) for few more details.
- Fork it
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create new Pull Request
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