6 Matching Annotations
  1. Oct 2018
    1. 8. Examples 8.1. Hello World! The following ni URI is generated from the text "Hello World!" (12 characters without the quotes), using the sha-256 algorithm shown with and without an authority field: ni:///sha-256;f4OxZX_x_FO5LcGBSKHWXfwtSx-j1ncoSt3SABJtkGk ni://example.com/sha-256;f4OxZX_x_FO5LcGBSKHWXfwtSx-j1ncoSt3SABJtkGk The following HTTP URL represents a mapping from the previous ni name based on the algorithm outlined above. http://example.com/.well-known/ni/sha-256/ f4OxZX_x_FO5LcGBSKHWXfwtSx-j1ncoSt3SABJtkGk
    1. hash://sha256/9f86d081884c7d659a2feaa0?type=text/plain#top \__/ \____/ \______________________/ \_____________/ \_/ | | | | | scheme algorithm hash query fragment
  2. Feb 2018
    1. imgHash.py

      具体实现:

      #!/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)
      

      参考代码:

      1. http://www.ruanyifeng.com/blog/2011/07/imgHash.txt
  3. Sep 2017