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提取文档中的图象标识信息

Shuguang Yang <[email protected]>
reply-to        [email protected]
to      python-cn`CPyUG`华蟒用户组 <[email protected]>
date    Wed, Aug 20, 2008 at 15:50
subject [CPyUG:62863] 用python提取文档中的图象，图象的标识信息

应用 Python 解决一些实际问题（

的提取嵌入在文档中的图像部分 

   1 import sys
   2 import os
   3 import string
   4 
   5 headers = [('JFIF', 6, 'jpg'), ('GIF', 0, 'gif'), ('PNG', 1, 'png')]
   6 marker = []
   7 filename = '/path/to/your/file'
   8 
   9 try:
  10    fid = open(filename, 'rb')
  11 except:
  12    sys.exit(1)
  13 
  14 s = 0
  15 
  16 for line in fid:
  17    for flag, offset, ext in headers:
  18        index = string.find(line, flag)
  19        if index > 0:
  20            pos = s + index - offset
  21            marker.append((pos, ext))
  22    s += len(line)
  23 
  24 fid.seek(0)
  25 imgnum = 0
  26 if len(marker) == 0:
  27    print 'No images included in this document'
  28    sys.exit(1)
  29 
  30 for info in marker:
  31    thispos = info[0]
  32    thisext = info[1]
  33    index = marker.index(info)
  34    try:
  35        nextinfo = marker[index + 1]
  36        nextpos = nextinfo[0]
  37        gap = nextpos - thispos
  38    except IndexError:
  39        nextpos = s
  40        gap = nextpos - thispos
  41    fid.seek(thispos)
  42    data = fid.read(gap)
  43    imgname = 'imgname%02d.%s' % (index, thisext)
  44    fid1 = open(imgname, 'wb')
  45    fid1.write(data)
  46    fid1.close()
  47    imgnum += 1
  48 
  49 fid.close()
  50 print '%02d images have been extracted' % imgnum

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创建 by -- ZoomQuiet [DateTime(2008-08-20T07:55:11Z)]

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