tessedit_char_whitelist不接受报价

Question

我已经开始在python中使用pytesserract。当我把单引号或双引号传入时

from PIL import Image
import pytesseract
import numpy as np

tesseract_config = r"""-c tessedit_char_whitelist=0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ#'<>(){};:"""
tesseract_language = "eng"

text = pytesseract.image_to_string(Image.open('res/outc001.jpg'), lang=tesseract_language, config=tesseract_config)
print text

它回来了

Traceback (most recent call last):
  File "main.py", line 15, in <module>
    text = pytesseract.image_to_string(Image.open('res/outc001.jpg'), lang=tesseract_language, config=tesseract_config).split('\n')
  File "/usr/local/lib/python2.7/dist-packages/pytesseract/pytesseract.py", line 193, in image_to_string
    return run_and_get_output(image, 'txt', lang, config, nice)
  File "/usr/local/lib/python2.7/dist-packages/pytesseract/pytesseract.py", line 140, in run_and_get_output
    run_tesseract(**kwargs)
  File "/usr/local/lib/python2.7/dist-packages/pytesseract/pytesseract.py", line 106, in run_tesseract
    command += shlex.split(config)
  File "/usr/lib/python2.7/shlex.py", line 279, in split
    return list(lex)
  File "/usr/lib/python2.7/shlex.py", line 269, in next
    token = self.get_token()
  File "/usr/lib/python2.7/shlex.py", line 96, in get_token
    raw = self.read_token()
  File "/usr/lib/python2.7/shlex.py", line 172, in read_token
    raise ValueError, "No closing quotation"
ValueError: No closing quotation

我一直在寻找一种逃避单引号和双引号的方法，但它们都没有奏效。

当我将tesseract作为自身运行时

tesseract res/outc001.jpg tesseract_out/out001 -c "tessedit_char_whitelist=0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ#\'\"<>(){};:"

效果很好。

Answer 1

Pytesseract使用舒克斯来分离配置参数。

shlex的转义字符是\，如果要在shlex.split()函数中插入引号，必须使用\转义。

• 如果只想在白名单中使用'： tesseract_config = "-c tessedit_char_whitelist=blahblah\'")
• 如果您只想要"： tesseract_config = '-c tessedit_char_whitelist=blahblah\“)
• 如果希望同时使用'和"： tesseract_config =‘-c tessedit_char_whitelist=blahblah\’\‘) 或 tesseract_config =“-c tessedit_char_whitelist=blahblah\”\‘“”)