port matching_to_many_images.cpp as cvmat#match_descriptors, and an example to use it

examples/matching_to_many_images.rb

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+require 'opencv'
+require 'benchmark'
+include OpenCV
+
+data = File.join(File.dirname(__FILE__), 'matching_to_many_images')
+
+query = IplImage.load File.join(data, 'query.png'), CV_LOAD_IMAGE_GRAYSCALE
+image_files = ['1.png', '2.png', '3.png'].map{|f| File.join(data, 'train', f)}
+images = image_files.map{|f| IplImage.load f, CV_LOAD_IMAGE_GRAYSCALE}
+
+
+matchs = query.match_descriptors("SURF", "SURF", "FlannBased", images)
+
+match, count = matchs.max_by {|image, count| count}
+
+puts "max match: #{image_files[images.index(match)]}"

examples/matching_to_many_images/train/trainImages.txt

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+1.png
+2.png
+3.png