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ruby-opencv/examples/houghcircle.rb

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#!/usr/bin/env ruby
# houghcircle.rb
require "rubygems"
require "opencv"
include OpenCV
original_window = GUI::Window.new "original"
hough_window = GUI::Window.new "hough circles"
image = IplImage::load "stuff.jpg"
gray = image.BGR2GRAY
result = image.clone
original_window.show image
detect = gray.hough_circles_gradient(2.0, 10, 200, 50)
puts detect.size
detect.each{|circle|
puts "#{circle.center.x},#{circle.center.y} - #{circle.radius}"
result.circle! circle.center, circle.radius, :color => CvColor::Red, :thickness => 3
}
hough_window.show result
GUI::wait_key