pytesseract代码优化

上述程序在windows平台运行时，会发现有黑色的控制台窗口一闪而过的画面，不太友好。

略微修改了pytesseract.py（C:Python27Libsite-packagespytesseract目录下），把上述过程进行了隐藏。

# modified by zhongtang hide console window
# new code
IS_WIN32 = 'win32' in str(sys.platform).lower()
if IS_WIN32:
   startupinfo = subprocess.STARTUPINFO()
   startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
   startupinfo.wShowWindow = subprocess.SW_HIDE
   proc = subprocess.Popen(command,
        stderr=subprocess.PIPE,startupinfo=startupinfo)
'''
# old code
proc = subprocess.Popen(command,
   stderr=subprocess.PIPE)
'''
# modified end

为了方便初学者，把pytesseract.py也贴出来，高手自行忽略。

#!/usr/bin/env python
'''
Python-tesseract is an optical character recognition (OCR) tool for python.
That is, it will recognize and "read" the text embedded in images.

Python-tesseract is a wrapper for google's Tesseract-OCR
( http://code.google.com/p/tesseract-ocr/ ). It is also useful as a
stand-alone invocation script to tesseract, as it can read all image types
supported by the Python Imaging Library, including jpeg, png, gif, bmp, tiff,
and others, whereas tesseract-ocr by default only supports tiff and bmp.
Additionally, if used as a script, Python-tesseract will print the recognized
text in stead of writing it to a file. Support for confidence estimates and
bounding box data is planned for future releases.


USAGE:
```
 > try:
 >   import Image
 > except ImportError:
 >   from PIL import Image
 > import pytesseract
 > print(pytesseract.image_to_string(Image.open('test.png')))
 > print(pytesseract.image_to_string(Image.open('test-european.jpg'), lang='fra'))
```

INSTALLATION:

Prerequisites:
* Python-tesseract requires python 2.5 or later or python 3.
* You will need the Python Imaging Library (PIL). Under Debian/Ubuntu, this is
 the package "python-imaging" or "python3-imaging" for python3.
* Install google tesseract-ocr from http://code.google.com/p/tesseract-ocr/ .
 You must be able to invoke the tesseract command as "tesseract". If this
 isn't the case, for example because tesseract isn't in your PATH, you will
 have to change the "tesseract_cmd" variable at the top of 'tesseract.py'.
 Under Debian/Ubuntu you can use the package "tesseract-ocr".
 
Installing via pip:  
See the [pytesseract package page](https://pypi.python.org/pypi/pytesseract)   
$> sudo pip install pytesseract  

Installing from source:  
$> git clone git@github.com:madmaze/pytesseract.git  
$> sudo python setup.py install  


LICENSE:
Python-tesseract is released under the GPL v3.

CONTRIBUTERS:
- Originally written by [Samuel Hoffstaetter](https://github.com/hoffstaetter) 
- [Juarez Bochi](https://github.com/jbochi)
- [Matthias Lee](https://github.com/madmaze)
- [Lars Kistner](https://github.com/Sr4l)

'''

# CHANGE THIS IF TESSERACT IS NOT IN YOUR PATH, OR IS NAMED DIFFERENTLY
tesseract_cmd = 'tesseract'

try:
  import Image
except ImportError:
  from PIL import Image
import subprocess
import sys
import tempfile
import os
import shlex

__all__ = ['image_to_string']

def run_tesseract(input_filename, output_filename_base, lang=None, boxes=False, config=None):
  '''
  runs the command:
    `tesseract_cmd` `input_filename` `output_filename_base`
  
  returns the exit status of tesseract, as well as tesseract's stderr output

  '''
  command = [tesseract_cmd, input_filename, output_filename_base]
  
  if lang is not None:
    command += ['-l', lang]

  if boxes:
    command += ['batch.nochop', 'makebox']
    
  if config:
    command += shlex.split(config)
    
  # modified by zhongtang hide console window
  # new code
  IS_WIN32 = 'win32' in str(sys.platform).lower()
  if IS_WIN32:
    startupinfo = subprocess.STARTUPINFO()
    startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
    startupinfo.wShowWindow = subprocess.SW_HIDE
  proc = subprocess.Popen(command,
      stderr=subprocess.PIPE,startupinfo=startupinfo)
  '''
  # old code
  proc = subprocess.Popen(command,
      stderr=subprocess.PIPE)
  '''
  # modified end
  
  return (proc.wait(), proc.stderr.read())

def cleanup(filename):
  ''' tries to remove the given filename. Ignores non-existent files '''
  try:
    os.remove(filename)
  except OSError:
    pass

def get_errors(error_string):
  '''
  returns all lines in the error_string that start with the string "error"

  '''

  lines = error_string.splitlines()
  error_lines = tuple(line for line in lines if line.find('Error') >= 0)
  if len(error_lines) > 0:
    return '
'.join(error_lines)
  else:
    return error_string.strip()

def tempnam():
  ''' returns a temporary file-name '''
  tmpfile = tempfile.NamedTemporaryFile(prefix="tess_")
  return tmpfile.name

class TesseractError(Exception):
  def __init__(self, status, message):
    self.status = status
    self.message = message
    self.args = (status, message)

def image_to_string(image, lang=None, boxes=False, config=None):
  '''
  Runs tesseract on the specified image. First, the image is written to disk,
  and then the tesseract command is run on the image. Resseract's result is
  read, and the temporary files are erased.
  
  also supports boxes and config.
  
  if boxes=True
    "batch.nochop makebox" gets added to the tesseract call
  if config is set, the config gets appended to the command.
    ex: config="-psm 6"

  '''

  if len(image.split()) == 4:
    # In case we have 4 channels, lets discard the Alpha.
    # Kind of a hack, should fix in the future some time.
    r, g, b, a = image.split()
    image = Image.merge("RGB", (r, g, b))
  
  input_file_name = '%s.bmp' % tempnam()
  output_file_name_base = tempnam()
  if not boxes:
    output_file_name = '%s.txt' % output_file_name_base
  else:
    output_file_name = '%s.box' % output_file_name_base
  try:
    image.save(input_file_name)
    status, error_string = run_tesseract(input_file_name,
                       output_file_name_base,
                       lang=lang,
                       boxes=boxes,
                       config=config)
    if status:
      #print 'test' , status,error_string
      errors = get_errors(error_string)
      raise TesseractError(status, errors)
    f = open(output_file_name)
    try:
      return f.read().strip()
    finally:
      f.close()
  finally:
    cleanup(input_file_name)
    cleanup(output_file_name)

def main():
  if len(sys.argv) == 2:
    filename = sys.argv[1]
    try:
      image = Image.open(filename)
      if len(image.split()) == 4:
        # In case we have 4 channels, lets discard the Alpha.
        # Kind of a hack, should fix in the future some time.
        r, g, b, a = image.split()
        image = Image.merge("RGB", (r, g, b))
    except IOError:
      sys.stderr.write('ERROR: Could not open file "%s"
' % filename)
      exit(1)
    print(image_to_string(image))
  elif len(sys.argv) == 4 and sys.argv[1] == '-l':
    lang = sys.argv[2]
    filename = sys.argv[3]
    try:
      image = Image.open(filename)
    except IOError:
      sys.stderr.write('ERROR: Could not open file "%s"
' % filename)
      exit(1)
    print(image_to_string(image, lang=lang))
  else:
    sys.stderr.write('Usage: python pytesseract.py [-l language] input_file
')
    exit(2)

if __name__ == '__main__':
  main()