phash notes

gistfile1.rb

# ruby-1.9.2-p180 :001 > require 'mini_magick'
#  => true 
# ruby-1.9.2-p180 :002 > i = MiniMagick::Image.open('sample.jpg')
#  => #<MiniMagick::Image:0x000000015bc448 @path="/tmp/mini_magick20110721-11512-ru54lb.jpg", @tempfile=#<File:/tmp/mini_magick20110721-11512-ru54lb.jpg (closed)>> 
# ruby-1.9.2-p180 :003 > i.resize '8x8'
#  => "" 
# ruby-1.9.2-p180 :004 > i.type 'Grayscale'
#  => "" 
# ruby-1.9.2-p180 :005 > i.write 'out.jpg'


####
require 'RMagick'
image = Magick::Image.read('out.jpg') do |i|
  i.colorspace = Magick::ColorspaceType.values[2]
end
image = image[0]
image.view(0,0,8,8)

# http://www.hackerfactor.com/blog/index.php?/archives/432-Looks-Like-It.html
# http://stackoverflow.com/questions/4777070/hamming-distance-on-binary-strings-in-sql