experimental implementation for OpenCV 3

examples/facedetect.rb

@@ -0,0 +1,15 @@
+require 'opencv'
+
+m = Cv::imread('images/lenna.jpg', -1)
+classifier = Cv::CascadeClassifier.new('haarcascade_frontalface_alt.xml')
+rects = classifier.detect_multi_scale(m)
+color = Cv::Scalar.new(0, 255, 255)
+rects.each do |r|
+  pt1 = Cv::Point.new(r.x, r.y)
+  pt2 = Cv::Point.new(r.x + r.width, r.y + r.height)
+  m.rectangle!(pt1, pt2, color, thickness: 3, line_type: Cv::CV_AA)
+end
+
+w = Cv::Window.new('Face detect')
+w.show(m)
+Cv::wait_key