Python : OSError: [Errno 2] No such file or direct

问题:

I am using pytesseract lib to extract text from image. This works fine when I am running code on localhost. But gives me above error when I deploy on openshift.

Below is code what I have written so far.

try:
  import Image
except ImportError:
  from PIL import Image
import pytesseract
filePath = PATH_WHERE_FILE_IS_LOCATED # '/var/lib/openshift/555.../app-root/data/data/y.jpg'
text = pytesseract.image_to_string(Image.open(filePath))  # this line produces error

Traceback of above error is

>>> pytesseract.image_to_string(Image.open(filePath))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/var/lib/openshift/56faaee42d527151d5000089/app-  root/runtime/repo/pytesseract/pytesseract.py", line 132, in  image_to_string
boxes=boxes)
File "/var/lib/openshift/56faaee42d527151d5000089/app-root/runtime/repo/pytesseract/pytesseract.py", line 73, in run_tesseract
stderr=subprocess.PIPE)
File "/opt/rh/python27/root/usr/lib64/python2.7/subprocess.py", line 710, in __init__
errread, errwrite)
File "/opt/rh/python27/root/usr/lib64/python2.7/subprocess.py", line 1327, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory

But Image.open(filePath) returns object reference

 <PIL.PngImagePlugin.PngImageFile image mode=RGBA size=1366x768 at 0x7FC5A9F719D0>

How to remove this error ? thanks in advance!!

回答1:

Either you don't have tesseract-ocr installed on "openshift", or it is not in your PATH. See https://pypi.python.org/pypi/pytesseract/0.1 Check that you can execute tesseract command from command line.

回答2:

As mentioned here install tesseract-ocr

You can rhc ssh to run commands. More windows specific details can be found here.

回答3:

IMHO and if i understand well openshift, it maybe like Heroku, where the filesystems are volatile and the paths must be from slightly different or totally different,so, at first check:

1. the paths are the same as in your local dev environment
2. the paths exist
3. you have enough rights to access the files in paths
4. Please check openshift docs, file system specially:

I hope i was helpfull

回答4:

Try this code, and check where is the error:

try:
  import Image
  print("image not from PIL")
except ImportError:
  print("image from PIL")
  from PIL import Image
import pytesseract
import os
filePath = PATH_WHERE_FILE_IS_LOCATED # '/var/lib/openshift/555.../app-root/data/data/y.jpg'
if not os.path.exist(filePath):
    print("no image file")
I=None
try:
    I=Image.open(filePath)
except Exception as e:
    raise RuntimeError(" Can't open image because %s"% e)
text = pytesseract.image_to_string(I)  # this line produces error

PS: You can print modules versions like this:

print Image.__version__

回答5:

I think you may have not entered the correct path to the image. You should keep your paths in check.

Also have you verified the installation of tesseract-ocr? You should see that no errors are produced when you call the module using the import function and by checking it from the command line utility.

And as Wuelfhis Asuaje says you should make sure you have enough rights to access the files in the path.

回答6:

You should install google tesseract-ocr from http://code.google.com/p/tesseract-ocr/.

Make sure the tesseract command is available on the server.

Under the hood, pytesseract invokes the tesseract command with subprocess (https://github.com/madmaze/pytesseract/blob/master/src/pytesseract.py#L93):

proc = subprocess.Popen(command,
            stderr=subprocess.PIPE)

Now guess what happens if the command is not available?

In [45]: subprocess.Popen(['tesseract'])
---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-45-f4e9dd5a7f0b> in <module>()
----> 1 subprocess.Popen(['tesseract'])

/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.pyc in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags)
    708                                 p2cread, p2cwrite,
    709                                 c2pread, c2pwrite,
--> 710                                 errread, errwrite)
    711         except Exception:
    712             # Preserve original exception in case os.close raises.

/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.pyc in _execute_child(self, args, executable, preexec_fn, close_fds, cwd, env, universal_newlines, startupinfo, creationflags, shell, to_close, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite)
   1333                         raise
   1334                 child_exception = pickle.loads(data)
-> 1335                 raise child_exception
   1336
   1337

OSError: [Errno 2] No such file or directory