Add new OCR backend using PyOCR. Remove current direct call Tesseract backend.

mayan/apps/ocr/backends/tesseract.py

@@ -1,59 +0,0 @@
-from __future__ import unicode_literals
-
-import logging
-
-import sh
-
-from PIL import Image
-import pytesseract
-
-from ..classes import OCRBackendBase
-from ..exceptions import OCRError
-from ..settings import setting_tesseract_path
-
-logger = logging.getLogger(__name__)
-
-
-class Tesseract(OCRBackendBase):
-    def __init__(self, *args, **kwargs):
-        super(Tesseract, self).__init__(*args, **kwargs)
-        try:
-            self.binary = sh.Command(setting_tesseract_path.value)
-        except sh.CommandNotFound:
-            self.binary = None
-
-    def get_languages(self):
-        if self.binary:
-            result = self.binary(list_langs=True)
-
-            return [
-                language for language in result.stderr.split('\n') if language
-            ]
-        else:
-            return ()
-
-    def execute(self, *args, **kwargs):
-        """
-        Execute the command line binary of tesseract
-        """
-        super(Tesseract, self).execute(*args, **kwargs)
-
-        # TODO: pass tesseract binary path to the pytesseract
-        image = Image.open(self.converter.get_page())
-        try:
-            result = pytesseract.image_to_string(
-                image=image, lang=self.language
-            )
-            # If tesseract gives an error with a language parameter
-            # re-run it with no language parameter
-        except Exception as exception:
-            error_message = 'Exception calling pytesseract with language option: {}; {}'.format(self.language, exception)
-
-            if self.binary:
-                if self.language not in self.get_languages():
-                    error_message = '{}\nThe requested Tesseract language file for "{}" is not available and needs to be installed.\nIf using Debian or Ubuntu run: apt-get install tesseract-ocr-{}'.format(error_message, self.language, self.language)
-
-            logger.error(error_message)
-            raise OCRError(error_message)
-
-        return result