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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 tempfile
from ocrfeeder.util.lib import debug
import gettext
import Image, ImageDraw
import os.path
from ocrfeeder.util import graphics
import sys
_ = gettext.gettext
class ImageProcessor:
def __init__(self, path_to_image, window_size = None):
self.window_size = window_size
error_message = _("A problem occurred while trying to open the image:\n %s\n"
"Ensure the image exists or try converting it to another format.") % path_to_image
if os.path.isfile(path_to_image):
try:
self.original_image = Image.open(path_to_image)
self.black_n_white_image = self.original_image.convert('L')
if not self.window_size:
self.window_size = self.original_image.size[1] / 60.
debug('Window Size: ', self.window_size)
except:
debug(sys.exc_info())
raise ImageManipulationError(error_message)
else:
debug(sys.exc_info())
raise ImageManipulationError(error_message)
def __windowContrast(self, bgcolor, x, y, constrast_tolerance = 120):
image = self.black_n_white_image
width, height = image.size
image_upper_left_corner_x = x * self.window_size
image_upper_left_corner_y = y * self.window_size
i, j = 1, 1
while j < self.window_size + 1:
if not image_upper_left_corner_y + j < height:
break
while i < self.window_size + 1:
if not image_upper_left_corner_x + i < width:
break
if graphics.colorsContrast(image.getpixel((image_upper_left_corner_x + i, image_upper_left_corner_y + j)), bgcolor, constrast_tolerance):
return 1
i += 3
i = 1
j += 3
return 0
def imageToBinary(self):
image = self.black_n_white_image
binary_info = ['']
width, height = image.size
i, j = 0, 0
while j < height / self.window_size:
while i < width / self.window_size:
binary_info[-1] += str(self.__windowContrast(255, i, j))
i += 1
i = 0
binary_info += ['']
j += 1
return binary_info
class Slicer:
def __init__(self, original_image, temp_dir = '/tmp'):
self.original_image = original_image
self.temp_dir = temp_dir
def slice(self, bounding_box):
return self.original_image.crop(bounding_box)
def sliceFromPointsList(self, points_list):
if len(points_list) < 3:
raise InsuficientPointsForPolygon
bounding_box = graphics.getContainerRectangle(points_list)
return self.original_image.crop(bounding_box)
def sliceFromBlock(self, block, window_size):
cropped_image = self.slice(block.translateToUnits(window_size))
image_file = tempfile.mkstemp(dir = self.temp_dir)[1]
cropped_image.save(image_file, format = 'PNG')
class ContentAnalyser:
def __init__(self, image):
self.image = image
def getHeight(self):
width, height = self.image.size
image_draw = ImageDraw.Draw(self.image)
i = 0
while i+3 < height:
current_line_image = self.image.crop((0, i, width, i + 3))
if len(current_line_image.getcolors()) < 10:
image_draw.rectangle((0, i, width, i + 3), fill = (255, 255, 255))
i += 3
def __getBlankSpaceFromTopToBottom(self, image):
width, height = image.size
i = 0
while i + 2 < height:
current_line_image = image.crop((0, i, width, i + 1))
if len(current_line_image.getcolors()) > 1:
break
i += 2
return i
class ImageManipulationError(Exception):
def __init__(self, value):
self.value = value
def __str__(self):
return self.value
class InsuficientPointsForPolygon(Exception):
def __init__(self):
pass
def __str__(self):
return 'Insufficient number of points for polygon. Must be at least three points.'
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