79 lines
2.3 KiB
Python
Executable File
79 lines
2.3 KiB
Python
Executable File
#Some code from http://wiki.github.com/hoffstaetter/python-tesseract
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import os
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import subprocess
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import tempfile
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from django.utils.translation import ugettext as _
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from django.contrib import messages
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from common.conf.settings import TEMPORARY_DIRECTORY
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from documents.models import Document
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from converter.api import convert_document_for_ocr
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from ocr.conf.settings import TESSERACT_PATH
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#from literals import QUEUEDOCUMENT_STATE_PROCESSING, \
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# QUEUEDOCUMENT_STATE_ERROR, QUEUEDOCUMENT_STATE_PENDING
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#from models import DocumentQueue
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def cleanup(filename):
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''' tries to remove the given filename. Ignores non-existent files '''
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try:
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os.remove(filename)
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except OSError:
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pass
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class TesseractError(Exception):
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pass
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# def __init__(self, status, message):
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# self.status = status
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# self.message = message
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def get_errors(error_string):
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'''
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returns all lines in the error_string that start with the string "error"
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'''
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lines = error_string.splitlines()
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return lines[1]
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#error_lines = (line for line in lines if line.find('error') >= 0)
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#return '\n'.join(error_lines)
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def run_tesseract(input_filename, output_filename_base, lang=None):
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command = [TESSERACT_PATH, input_filename, output_filename_base]
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if lang is not None:
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command += ['-l', lang]
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proc = subprocess.Popen(command, stderr=subprocess.PIPE)
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return (proc.wait(), proc.stderr.read())
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def do_document_ocr(document):
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for page_index, document_page in enumerate(document.documentpage_set.all()):
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imagefile = convert_document_for_ocr(document, page=page_index)
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desc, filepath = tempfile.mkstemp()
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try:
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status, error_string = run_tesseract(imagefile, filepath)
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if status:
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errors = get_errors(error_string)
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raise TesseractError(errors)
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finally:
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ocr_output = os.extsep.join([filepath, 'txt'])
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f = file(ocr_output)
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try:
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document_page = document.documentpage_set.get(page_number=page_index+1)
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document_page.content = f.read().strip()
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document_page.page_label = _(u'Text from OCR')
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document_page.save()
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finally:
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f.close()
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cleanup(filepath)
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cleanup(ocr_output)
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cleanup(imagefile)
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