captcha_resolver.py

import pytesseract
import sys
import argparse
try:
    import Image
except ImportError:
    from PIL import Image
from subprocess import check_output


def resolve(path):
	print("Resampling the Image")
	check_output(['convert', path, '-resample', '600', path])
	return pytesseract.image_to_string(Image.open(path))

if __name__=="__main__":
	argparser = argparse.ArgumentParser()
	argparser.add_argument('path',help = 'Captcha file path')
	args = argparser.parse_args()
	path = args.path
	print('Resolving Captcha')
	captcha_text = resolve(path)
	print('Extracted Text',captcha_text)

Hi,
Same here:
subprocess.CalledProcessError: Command '['convert', 'captcha1.png', '-resample', '600', 'captcha1.png']' returned non-zero exit status 4.

I guess it is because 'convert' is not a directly available program in Windows. It probably Works in Linux or something. My guess only.
Indeed, you have to install ImageMagick and redirect the link in Windows.
The captcha though worked very poorly, recognizing nearly nothing...

@neha1909 did you solve the error?

The code didn't worked for me.
I got following error.

Invalid Parameter - -resample
Traceback (most recent call last):
File "ca.py", line 22, in <module>
    captcha_text = resolve(path)
  File "ca.py", line 13, in resolve
    check_output(['convert', path, '-resample', '600', path])
  File "C:\Users\Gupta Niwas\AppData\Local\Programs\Python\Python36-32\lib\subprocess.py", line 336, in check_output
    **kwargs).stdout
  File "C:\Users\Gupta Niwas\AppData\Local\Programs\Python\Python36-32\lib\subprocess.py", line 418, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['convert', 'cap.jpg', '-resample', '600', 'cap.jpg']' returned non-zero exit status 4.

Also can anyone explain to me where is ImageMagick used here???

Hello,

I am experiencing the same error
Invalid Parameter - -resample

I do have ImageMagick installed and added to PATH. When I manually enter convert cap.jpg -resample 600 cap_resampled.jpg it does the job perfectly

Can you please suggest how you installed ImageMagick and manully convert image?

I've installed but it doesn't work for captcha :(

It does not work, the same problem

magick convert "1.png" -resample 600 "2.png" on windows?

FIX: change the path at check_output so the first argument is the full path to magick.exe.
for example,
check_output([r"C:\Program Files\ImageMagick-7.0.8-Q16\magick.exe", path, '-resample', '600', path])

Resolving Captcha
Resampling the Image
Traceback (most recent call last):
File "CaptchaSolver.py", line 22, in
captcha_text = resolve(path)
File "CaptchaSolver.py", line 13, in resolve
check_output(["C:\Program Files\ImageMagick-7.0.8-Q16", path, '-resample', '600', path])
File "C:\Python27\lib\subprocess.py", line 216, in check_output
process = Popen(stdout=PIPE, *popenargs, **kwargs)
File "C:\Python27\lib\subprocess.py", line 394, in init
errread, errwrite)
File "C:\Python27\lib\subprocess.py", line 644, in _execute_child
startupinfo)
WindowsError: [Error 5] Access is denied

Hi,
I got below error.
Please help.

Resolving Captcha
Resampling the Image
Traceback (most recent call last):
File "C:\Users\yenag\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pytesseract\pytesseract.py", line 226, in run_tesseract
proc = subprocess.Popen(cmd_args, **subprocess_args())
File "C:\Users\yenag\AppData\Local\Programs\Python\Python38-32\lib\subprocess.py", line 854, in init
self._execute_child(args, executable, preexec_fn, close_fds,
File "C:\Users\yenag\AppData\Local\Programs\Python\Python38-32\lib\subprocess.py", line 1307, in _execute_child
hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] The system cannot find the file specified

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "OCR_image_processing.py", line 22, in
captcha_text = resolve(path)
File "OCR_image_processing.py", line 14, in resolve
return pytesseract.image_to_string(Image.open(path))
File "C:\Users\yenag\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pytesseract\pytesseract.py", line 344, in image_to_string
return {
File "C:\Users\yenag\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pytesseract\pytesseract.py", line 347, in
Output.STRING: lambda: run_and_get_output(*args),
File "C:\Users\yenag\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pytesseract\pytesseract.py", line 258, in run_and_get_output
run_tesseract(**kwargs)
File "C:\Users\yenag\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pytesseract\pytesseract.py", line 230, in run_tesseract
raise TesseractNotFoundError()
pytesseract.pytesseract.TesseractNotFoundError: tesseract is not installed or it's not in your path

sudo apt-get install tesseract-ocr

Code works fine but doesn't extract the captcha.