ruby-opencv

Requirement

Install

Linux/Mac

$ gem install ruby-opencv -- --with-opencv-dir=/path/to/opencvdir

Windows (RubyInstaller)

Sample code

Load and Display an Image

require 'opencv'
include OpenCV
if ARGV.size == 0
 puts "Usage: ruby #{__FILE__} ImageToLoadAndDisplay"
 exit
end
image = nil
begin
 image = CvMat.load(ARGV[0], CV_LOAD_IMAGE_COLOR) # Read the file.
rescue
 puts 'Could not open or find the image.'
 exit
end
window = GUI::Window.new('Display window') # Create a window for display.
window.show(image) # Show our image inside it.
GUI::wait_key # Wait for a keystroke in the window.

Face Detection

require 'opencv'
include OpenCV
if ARGV.length < 2
 puts "Usage: ruby #{__FILE__} source dest"
 exit
end
data = './data/haarcascades/haarcascade_frontalface_alt.xml'
detector = CvHaarClassifierCascade::load(data)
image = CvMat.load(ARGV[0])
detector.detect_objects(image).each do |region|
 color = CvColor::Blue
 image.rectangle! region.top_left, region.bottom_right, :color => color
end
image.save_image(ARGV[1])
window = GUI::Window.new('Face detection')
window.show(image)
GUI::wait_key

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