pytesseract Windows Error 6

今天测试了一下 pytesseract , 用来识别验证码, 结果出了点小问题, 记录如下.

try:
    import Image
except ImportError:
    from PIL import Image
import pytesseract

img = Image.open('a.jpg','r')
print(pytesseract.image_to_string(img))

执行之后, 报错

Traceback (most recent call last):
  File "D:\tests\test_pytesseract.py", line 30, in <module>
    print(pytesseract.image_to_string(img))
  File "C:\Python27\lib\site-packages\pytesseract\pytesseract.py", line 164, in image_to_string
    config=config)
  File "C:\Python27\lib\site-packages\pytesseract\pytesseract.py", line 95, in run_tesseract
    stderr=subprocess.PIPE,
  File "C:\Python27\lib\subprocess.py", line 702, in __init__
    errread, errwrite), to_close = self._get_handles(stdin, stdout, stderr)
  File "C:\Python27\lib\subprocess.py", line 850, in _get_handles
    c2pwrite = self._make_inheritable(c2pwrite)
  File "C:\Python27\lib\subprocess.py", line 884, in _make_inheritable
    _subprocess.DUPLICATE_SAME_ACCESS)
WindowsError: [Error 6] 

最后发现是subprocess的问题, 讲pytesseract的文件修改一下即可.

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)

    proc = subprocess.Popen(command,stderr=subprocess.PIPE)
    return (proc.wait(), proc.stderr.read())

修改为:

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)

    proc = subprocess.Popen(command,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            shell=True
            )
    return (proc.wait(), proc.stderr.read())

即可.