错误：未安装 tesseract 或不在您的 PATH 中

Question

我是 pytesseract 和 OCR 的新手，我在互联网上搜索了这是用于从图像中提取文本的工具。但是，我对这个工具一无所知。现在，我遇到了这个错误： tesseract 没有安装或者它不在你的 PATH 中。有关详细信息，请参阅 README 文件。
我不知道如何解决这个问题，我尝试了在互联网上找到的各种解决方案，但不幸的是没有奏效。

错误代码：

---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
~/.local/lib/python3.9/site-packages/pytesseract/pytesseract.py in run_tesseract(input_filename, output_filename_base, extension, lang, config, nice, timeout)
    254     try:
--> 255         proc = subprocess.Popen(cmd_args, **subprocess_args())
    256     except OSError as e:

/opt/conda/lib/python3.9/subprocess.py in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds, user, group, extra_groups, encoding, errors, text, umask)
    950 
--> 951             self._execute_child(args, executable, preexec_fn, close_fds,
    952                                 pass_fds, cwd, env,

/opt/conda/lib/python3.9/subprocess.py in _execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, restore_signals, gid, gids, uid, umask, start_new_session)
   1822                         err_msg = os.strerror(errno_num)
-> 1823                     raise child_exception_type(errno_num, err_msg, err_filename)
   1824                 raise child_exception_type(err_msg)

FileNotFoundError: [Errno 2] No such file or directory: 'tesseract'

During handling of the above exception, another exception occurred:

TesseractNotFoundError                    Traceback (most recent call last)
<ipython-input-7-96e86f1cd397> in <module>
      1 img = cv2.imread("Z++¦hler NSHV KTL-Durchlaufanlage-1.jpg")
----> 2 data = pytesseract.image_to_string(img)
      3 print(data)
      4 # plt.imshow(img)

~/.local/lib/python3.9/site-packages/pytesseract/pytesseract.py in image_to_string(image, lang, config, nice, output_type, timeout)
    407     args = [image, 'txt', lang, config, nice, timeout]
    408 
--> 409     return {
    410         Output.BYTES: lambda: run_and_get_output(*(args + [True])),
    411         Output.DICT: lambda: {'text': run_and_get_output(*args)},

~/.local/lib/python3.9/site-packages/pytesseract/pytesseract.py in <lambda>()
    410         Output.BYTES: lambda: run_and_get_output(*(args + [True])),
    411         Output.DICT: lambda: {'text': run_and_get_output(*args)},
--> 412         Output.STRING: lambda: run_and_get_output(*args),
    413     }[output_type]()
    414 

~/.local/lib/python3.9/site-packages/pytesseract/pytesseract.py in run_and_get_output(image, extension, lang, config, nice, timeout, return_bytes)
    285         }
    286 
--> 287         run_tesseract(**kwargs)
    288         filename = kwargs['output_filename_base'] + extsep + extension
    289         with open(filename, 'rb') as output_file:

~/.local/lib/python3.9/site-packages/pytesseract/pytesseract.py in run_tesseract(input_filename, output_filename_base, extension, lang, config, nice, timeout)
    257         if e.errno != ENOENT:
    258             raise e
--> 259         raise TesseractNotFoundError()
    260 
    261     with timeout_manager(proc, timeout) as error_string:

TesseractNotFoundError: tesseract is not installed or it's not in your PATH. See README file for more information.

对应代码：

!pip install tesseract
import pytesseract
import cv2
from PIL import Image
import matplotlib.pyplot as plt
img = cv2.imread("meter.jpg")
data = pytesseract.image_to_string(img)
print(data)
# plt.imshow(img)

首先让我告诉你我正在使用 Jupyterhub。实际上，我在我大学的 jupyterhub 上注册了一个帐户。此外，我在网上搜索了可以使用 'cmd' 并解决问题的地方。如果是这样，请告诉我该怎么做，否则我必须联系 Uni 管理员来解决这个问题。任何帮助表示赞赏！

Answer 1

此错误的可能原因是您安装了 pytesseract 和 pip 而没有安装二进制文件。如果是这种情况，您可以按如下方式安装：

在 Linux 上：

sudo apt update
sudo apt install tesseract-ocr
sudo apt install libtesseract-dev

在 Windows 上：从 here 下载，然后将二进制路径插入到您的代码中

pytesseract.pytesseract.tesseract_cmd = 'C:\\Program Files (x86)\\Tesseract-OCR\\tesseract.exe'

在 Mac 上：

brew install tesseract