Module: Imagine

Defined in:
lib/imagine.rb

Instance Method Summary collapse

Instance Method Details

#compare_image_to(image) ⇒ Object 



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# File 'lib/imagine.rb', line 2

def compare_image_to(image)
  # http://en.wikipedia.org/wiki/RMSD
  aggregate_deviation = 0.0
  
  target_image.each_pixel do |target_pixel, x, y|      
    aggregate_deviation += compare_pixels(target_pixel, image.pixel_color(x, y))
  end
  
  1 - Math.sqrt(aggregate_deviation / (Magick::MaxRGB ** 2 * image_dimensions.x * image_dimensions.y * 3))
end