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require 'RMagick'
# The Image#find_similar_region searches for a region in the image
# similar to the target. This example uses a rectangle from the image
# as the target, assuring that find_similar_region will succeed.
# Draw a red rectangle over the image that shows where the target matched.
img = Magick::Image.read(File.join(File.dirname(__FILE__), '../doc/ex/images/Flower_Hat.jpg')).first
target = img.crop(21, 94, 118, 126)
begin
res = img.find_similar_region(target)
if res
gc = Magick::Draw.new
gc.stroke('red')
gc.stroke_width(2)
gc.fill('none')
gc.rectangle(res[0], res[1], res[0]+target.columns, res[1]+target.rows)
gc.draw(img)
img.matte = false
puts "Found similar region. Writing `find_similar_region.gif'..."
img.write('find_similar_region.gif')
else
puts "No match!"
end
rescue NotImplementedError
$stderr.puts <<-END_MSG
The find_similar_region method is not supported by this version of
ImageMagick/GraphicsMagick.
END_MSG
end
exit
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