atomicjpeg.rb

require 'histogram/array'


def format_q(s)
	return s.scan(/\d+/).join('-')
end
directory = ARGV[0]
Dir.foreach(directory) do |img|
	next if img == '.' or img == '..'
	begin
	print File.basename(img)+','
	dct = `./dct_dump #{directory}/#{img} raw`
	dct = dct.split("\n").map(&:to_i)
	dct.sort!
	histogram = [*dct.group_by{ |v| v }.flat_map{ |k, v| [k, v.size] }]
	new_histogram = []
	$i = 0
	$num = histogram.size
	while $i < $num  do
		new_histogram << histogram[$i+1]		
		$i +=2
	end
	list = []
	$i = 1
	$num = new_histogram.size
	while $i < $num  do
		list << new_histogram[$i].to_f/new_histogram[$i-1]
		$i +=1
	end
	list.map! { |n| Math.sqrt(n) }
	sum=0
	list.each do |i|
		sum += i
	end
	average = sum / list.size
	error=0
	list.each do |i|
		error += (i-average).abs
	end	
	average_error = error/list.size
	puts average_error
	rescue
	end

end