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# -*- coding: utf-8 -*-
###########################################################################
# OCRFeeder - The complete OCR suite
# Copyright (C) 2009 Joaquim Rocha
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
###########################################################################
import string
import tempfile
import os
import xml.etree.ElementTree as ET
from xml.parsers.expat import ExpatError
from ocrfeeder.studio.dataHolder import TEXT_TYPE, IMAGE_TYPE
from ocrfeeder.util import lib
IMAGE_ARGUMENT = '$IMAGE'
FILE_ARGUMENT = '$FILE'
class Engine:
def __init__(self, name, engine_path, arguments, image = None, temporary_folder = '/tmp/', image_format = 'PPM', failure_string = ''):
self.name = name
self.engine_path = engine_path
self.arguments = arguments
if not self.name:
raise WrongSettingsForEngine("The engine's name cannot be empty!")
if not self.engine_path or not os.path.isfile(self.engine_path):
raise WrongSettingsForEngine("The engine's path must exist! Path: %s" % self.engine_path)
if image == None:
self.image_path = None
else:
self.image_path = self.setImage(image)
self.image_format = image_format
self.failure_string = failure_string
self.temporary_folder = temporary_folder
self.__color_information = None
def setImage(self, image):
image_file = tempfile.mkstemp(suffix = '.' + self.image_format.lower())[1]
image = image.convert('L')
try:
image.save(image_file, format = self.image_format)
except KeyError:
image.save(image_file)
self.image_path = image_file
def read(self):
parsed_arguments = self.arguments.replace(IMAGE_ARGUMENT, self.image_path)
file_name = None
if self.arguments.find(FILE_ARGUMENT) != -1:
file_name = tempfile.mkstemp(dir = self.temporary_folder)[1]
parsed_arguments = parsed_arguments.replace(FILE_ARGUMENT, file_name)
text = os.popen(self.engine_path + ' ' + parsed_arguments).read()
try:
try:
text = unicode(text, 'utf-8', 'replace')
except UnicodeDecodeError:
text = unicode(text, 'ascii', 'replace').encode('utf-8', 'replace')
finally:
os.unlink(self.image_path)
return text
def classify(self, reading_output, rules = []):
stripped_output = reading_output.strip()
if not stripped_output:
return IMAGE_TYPE
if self.failure_string and stripped_output.count(self.failure_string) > len(stripped_output) / 2:
return IMAGE_TYPE
if self.__punctuationTest(stripped_output):
return IMAGE_TYPE
return TEXT_TYPE
#else
# FINISH THIS!
def __punctuationTest(self, output):
no_punctuation_output = output
for char in string.punctuation:
no_punctuation_output = no_punctuation_output.replace(char, '')
no_punctuation_output = no_punctuation_output.replace(self.failure_string, '')
no_punctuation_output = no_punctuation_output.replace(' ', '')
if len(no_punctuation_output) < len(output) / 2:
return True
return False
def __is_not_greyscale(self, image):
colors = image.get_colors()
if colors:
for color in colors:
if ((color[1])[0] - (color[1])[1])>10 or ((color[1])[0] - (color[1])[2])>10:
return False
return True
def saveToXml(self, file_path):
engine_info = {'name': self.name,
'engine_path': self.engine_path,
'arguments': self.arguments,
'image_format': self.image_format,
'failure_string': self.failure_string}
root = ET.Element('engine')
for key, value in engine_info.items():
if not key or not value:
continue
subelement = ET.SubElement(root, key)
subelement.text = str(value)
return ET.ElementTree(root).write(file_path, 'UTF-8')
class OcrEnginesManager:
def __init__(self, configuration_manager):
self.ocr_engines = []
self.configuration_manager = configuration_manager
def getEnginesNames(self):
return [engine.name for engine, path in self.ocr_engines]
def getEnginePath(self, engine):
for eng, path in self.ocr_engines:
if eng == engine:
return path
return None
def replaceEngine(self, engine, new_engine):
for i in xrange(len(self.ocr_engines)):
eng, path = self.ocr_engines[i]
if eng == engine:
new_path = self.engineToXml(new_engine, path)
self.ocr_engines[i] = new_engine, path
return True
return False
def makeEnginesFromFolder(self, folder):
self.ocr_engines = []
for xml_file in self.getXmlFilesInFolder(folder):
try:
self.ocr_engines.append((self.getEngineFromXml(xml_file), xml_file))
except WrongSettingsForEngine, we:
lib.debug("Cannot load engine at %s: %s" %( xml_file, str(we)))
if not len(self.ocr_engines):
lib.debug("Warning: no engines found!")
def getEngineFromXml(self, xml_file_name):
document = ET.parse(xml_file_name)
root_node = document.getroot()
arguments = {}
for child in root_node.getchildren():
arg_name = child.tag
arg_value = child.text
arguments[arg_name] = arg_value
return Engine(**arguments)
def getXmlFilesInFolder(self, folder):
return [os.path.join(folder, file) for file in os.listdir(folder) if file.endswith('.xml')]
def newEngine(self, name, engine_path, arguments, image_format, failure_string):
engine = Engine(name = name, engine_path = engine_path, arguments = arguments, image_format = image_format, failure_string = failure_string)
return engine
def delete(self, index):
path = self.ocr_engines[index][1]
os.remove(path)
del self.ocr_engines[index]
def addNewEngine(self, engine):
path = self.engineToXml(engine)
self.ocr_engines.append((engine,path))
def engineToXml(self, engine, path = None):
if not path:
path = os.path.join(self.configuration_manager.user_engines_folder, engine.name + '.xml')
path = lib.getNonExistingFileName(path)
engine_content = engine.saveToXml(path)
return path
class WrongSettingsForEngine(Exception):
def __init__(self, message):
super(WrongSettingsForEngine, self).__init__(message)
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