obj_detect.rb

#!/usr/bin/env ruby

require 'opencv'
include OpenCV

# if ARGV.size != 1
#   puts 'Usage: ruby #{__FILE__} Image'
#   exit
# end

img = IplImage.load('./img/test.jpg')

# faces = OpenCV::CvHaarClassifierCascade.load './cascade.xml'
faces = OpenCV::CvHaarClassifierCascade.load './cascade_fix.xml'

faces.detect_objects(img.to_CvMat) { |rect|
  img.rectangle!(rect.top_left, rect.bottom_right, :color => CvColor::Red)
}

window = GUI::Window.new('detect face')
window.show(img)
GUI::wait_key