example of using match template

examples/match_template.rb

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+#!/usr/bin/env ruby
+
+# A demo of Ruby/OpenCV's match_template function
+
+require 'opencv'
+include OpenCV
+
+puts 'This program demonstrates the match_template function'
+puts 'Usage:'
+puts "ruby #{__FILE__} <template_filename> <match_filename>"
+puts
+
+template_filename = (ARGV.size == 2) ? ARGV[0] : File.expand_path(File.dirname(__FILE__) + '/../test/samples/lena-eyes.jpg')
+match_image_filename = (ARGV.size == 2) ? ARGV[1] : File.expand_path(File.dirname(__FILE__) + '/../test/samples/lena-inpaint.jpg')
+
+template = CvMat.load(template_filename)
+match_image = CvMat.load(match_image_filename)
+result = match_image.match_template(template)
+
+pt1 = result.min_max_loc[2] # minimum location
+pt2 = CvPoint.new(pt1.x + template.width, pt1.y + template.height)
+match_image.rectangle!(pt1, pt2, :color => CvColor::Black, :thickness => 3)
+
+window = GUI::Window.new('Display window') # Create a window for display.
+window.show(match_image) # Show our image inside it.
+GUI::wait_key # Wait for a keystroke in the window.