image_similarity_check.rb

#!/usr/bin/ruby
# coding: utf-8

def get_score file1,file2
  def pattern path
    f = 16
    tmp = '/tmp/imgmatch.xbm'
    `convert -level 0%,75%,0.8 -fuzz 50% -trim -resize #{f}x#{f}! #{path} #{tmp}`
    ptn = File.open(tmp).read.scan(/0x[\dA-F]{2}/).map{|n| n.hex.to_s(2).rjust(8, '0')}.join.split(//)
    File.delete tmp
    return ptn
  end
  a1 = pattern file1
  a2 = pattern file2
  a1.zip(a2).count{|n, m| n == m}.to_f / a1.size.to_f
end

puts get_score(ARGV[0], ARGV[1]).to_s