def do_document_ocr(document):
"""
Do OCR on all the pages of the given document object, first
trying to extract text from PDF using pdftotext then by calling
tesseract
"""
for page_index, document_page in enumerate(document.documentpage_set.all()):
desc, filepath = tempfile.mkstemp()
imagefile = None
source = u""
try:
if document.file_mimetype == u"application/pdf":
pdf_filename = os.extsep.join([filepath, u"pdf"])
document.save_to_file(pdf_filename)
run_pdftotext(pdf_filename, filepath, document_page.page_number)
cleanup(pdf_filename)
if os.stat(filepath).st_size == 0:
# PDF page had no text, run tesseract on the page
imagefile = convert_document_for_ocr(document, page=page_index)
run_tesseract(imagefile, filepath, TESSERACT_LANGUAGE)
ocr_output = os.extsep.join([filepath, u"txt"])
source = _(u"Text from OCR")
else:
ocr_output = filepath
source = _(u"Text extracted from PDF")
else:
imagefile = convert_document_for_ocr(document, page=page_index)
run_tesseract(imagefile, filepath, TESSERACT_LANGUAGE)
ocr_output = os.extsep.join([filepath, u"txt"])
source = _(u"Text from OCR")
f = codecs.open(ocr_output, "r", "utf-8")
document_page = document.documentpage_set.get(page_number=page_index + 1)
document_page.content = ocr_cleanup(f.read().strip())
document_page.page_label = source
document_page.save()
f.close()
cleanup(ocr_output)
finally:
os.close(desc)
cleanup(filepath)
if imagefile:
cleanup(imagefile)
def do_document_ocr(document):
for page_index, document_page in enumerate(document.documentpage_set.all()):
imagefile = convert_document_for_ocr(document, page=page_index)
desc, filepath = tempfile.mkstemp()
try:
run_tesseract(imagefile, filepath, TESSERACT_LANGUAGE)
ocr_output = os.extsep.join([filepath, 'txt'])
f = codecs.open(ocr_output, 'r', 'utf-8')
document_page = document.documentpage_set.get(page_number=page_index+1)
document_page.content = f.read().strip()
document_page.page_label = _(u'Text from OCR')
document_page.save()
f.close()
cleanup(ocr_output)
except TesseractError, e:
cleanup(filepath)
cleanup(imagefile)
raise TesseractError(e)
finally: