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【Python】比较两个图片的相似度

作者:dezai / 发布于2014/4/10/ 2496

比较两个图片的相似度

#!/usr/bin/python
# Filename: histsimilar.py
# -*- coding: utf-8 -*-

import Image

def make_regalur_image(img, size = (256, 256)):
  return img.resize(size).convert('RGB')

def split_image(img, part_size = (64, 64)):
  w, h = img.size
  pw, ph = part_size
  
  assert w % pw == h % ph == 0
  
  return [img.crop((i, j, i+pw, j+ph)).copy() \
        for i in xrange(0, w, pw) \
        for j in xrange(0, h, ph)]

def hist_similar(lh, rh):
  assert len(lh) == len(rh)
  return sum(1 - (0 if l == r else float(abs(l - r))/max(l, r)) for l, r in zip(lh, rh))/len(lh)

def calc_similar(li, ri):
#  return hist_similar(li.histogram(), ri.histogram())
  return sum(hist_similar(l.histogram(), r.histogram()) for l, r in zip(split_image(li), split_image(ri))) / 16.0
      

def calc_similar_by_path(lf, rf):
  li, ri = make_regalur_image(Image.open(lf)), make_regalur_image(Image.open(rf))
  return calc_similar(li, ri)

def make_doc_data(lf, rf):
  li, ri = make_regalur_image(Image.open(lf)), make_regalur_image(Image.open(rf))
  li.save(lf + '_regalur.png')
  ri.save(rf + '_regalur.png')
  fd = open('stat.csv', 'w')
  fd.write('\n'.join(l + ',' + r for l, r in zip(map(str, li.histogram()), map(str, ri.histogram()))))
#  print >>fd, '\n'
#  fd.write(','.join(map(str, ri.histogram())))
  fd.close()
  import ImageDraw
  li = li.convert('RGB')
  draw = ImageDraw.Draw(li)
  for i in xrange(0, 256, 64):
    draw.line((0, i, 256, i), fill = '#ff0000')
    draw.line((i, 0, i, 256), fill = '#ff0000')
  li.save(lf + '_lines.png')
  

if __name__ == '__main__':
  path = r'testpic/TEST%d/%d.JPG'
  for i in xrange(1, 7):
    print 'test_case_%d: %.3f%%'%(i, \
      calc_similar_by_path('testpic/TEST%d/%d.JPG'%(i, 1), 'testpic/TEST%d/%d.JPG'%(i, 2))*100)
  
#  make_doc_data('test/TEST4/1.JPG', 'test/TEST4/2.JPG')

试试其它关键字

　图片相似度　

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