https://github.com/jenorish/crop_calculator

https://github.com/jenorish/crop_calculator

Last synced: 3 days ago
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• Host: GitHub
• URL: https://github.com/jenorish/crop_calculator
• Owner: jenorish
• License: mit
• Created: 2013-07-30T10:06:04.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2013-03-26T16:51:17.000Z (over 11 years ago)
• Last Synced: 2023-08-02T15:12:54.000Z (over 1 year ago)
• Language: Ruby
• Size: 68.4 KB
• Stars: 0
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

        
# CropCalculator

Given a target size and an ROI, calculate crop size. The return values 

can be used by RMagick or similar tool to create the actual cropped version.

To compute ROI using OpenCV's face detection, [face_ROI] (https://github.com/kreatio-sw/face_ROI).

## Installation

Add this line to your application's Gemfile:

    gem 'crop_calculator'

And then execute:

    $ bundle

Or install it yourself as:

    $ gem install crop_calculator

## Usage

````ruby

    offset_x, offset_y, crop_width, crop_height = 

      CropCalculator.calculate_crop_rect(target_width, target_height, img_width, img_height, roi_x, roi_y, roi_width, roi_height)

````

Full sample using RMagick and face_ROI

````ruby

module FaceROI

  OPENCV_BASE= '/usr/local'

end

require 'face_ROI'

require 'crop_calculator'

require 'rmagick'

  

def test_me(path)

  dimensions = [[50,50],[100,100],[400,400],[150,100],[200,300],[400,250]]

  

  f=FaceROI::Finder.new(path, FaceROI::CONFIG1)

  image=f.image_with_faces

  

  rm_img=Magick::Image.read(path)[0]

  img_width=rm_img.columns

  img_height=rm_img.rows

  

  roi_x, roi_y, roi_width, roi_height= f.roi

  dimensions.each do |dimension|

    target_width, target_height = dimension

    

    # Compute the crop

    offset_x, offset_y, crop_width, crop_height = 

      CropCalculator.calculate_crop_rect(target_width, target_height, img_width, img_height, roi_x, roi_y, roi_width, roi_height)

    out_path = path.sub(/\./, "-#{target_width}x#{target_height}.")

    out_path = "out/#{out_path}"

    

    rm_img.excerpt(offset_x, offset_y, crop_width, crop_height).resize(target_width, target_height).write(out_path)

    

  end

end

test_me 'test/IMG_0465.jpg'

````

## Contributing

1. Fork it

2. Create your feature branch (`git checkout -b my-new-feature`)

3. Commit your changes (`git commit -am 'Add some feature'`)

4. Push to the branch (`git push origin my-new-feature`)

5. Create new Pull Request