Wote用python实现HASH感知算法，求大神看看，能不能用java重写一个。

[Not_Sky]

imgHash.py #

#!/usr/bin/python

import glob
import os
import sys

from PIL import Image

EXTS = 'jpg', 'jpeg', 'JPG', 'JPEG', 'gif', 'GIF', 'png', 'PNG'

def avhash(im):
if not isinstance(im, Image.Image):
im = Image.open(im)
im = im.resize((8, 8), Image.ANTIALIAS).convert('L')
avg = reduce(lambda x, y: x + y, im.getdata()) / 64.
return reduce(lambda x, (y, z): x | (z << y),
enumerate(map(lambda i: 0 if i < avg else 1, im.getdata())),
0)

def hamming(h1, h2):
h, d = 0, h1 ^ h2
while d:
h += 1
d &= d - 1
return h

if __name__ == '__main__':
if len(sys.argv) <= 1 or len(sys.argv) > 3:
print "Usage: %s image.jpg [dir]" % sys.argv[0]
else:
im, wd = sys.argv[1], '.' if len(sys.argv) < 3 else sys.argv[2]
h = avhash(im)

os.chdir(wd)
images = []
for ext in EXTS:
images.extend(glob.glob('*.%s' % ext))

seq = []
prog = int(len(images) > 50 and sys.stdout.isatty())
for f in images:
seq.append((f

, hamming(avhash(f), h)))
if prog:
perc = 100. * prog / len(images)
x = int(2 * perc / 5)
print '\rCalculating... [' + '#' * x + ' ' * (40 - x) + ']',
print '%.2f%%' % perc, '(%d/%d)' % (prog, len(images)),
sys.stdout.flush()
prog += 1

if prog: print
for f, ham in sorted(seq, key=lambda i: i[1]):
print "%d\t%s" % (ham, f)