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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/>.
###########################################################################
from lib import getStandardDeviation
from ocrfeeder.util.lib import debug
import Image
import gtk
import math
def getContainerRectangle(points_list):
points_list = list(points_list)
points_list.sort()
leftmost_x = (points_list[0])[0]
rightmost_x = (points_list[-1])[0]
i = 0
while i < len(points_list):
current_point = points_list[i]
points_list[i] = (current_point[1], current_point[0])
i += 1
points_list.sort()
highest_y = (points_list[0])[0]
lowest_y = (points_list[-1])[0]
return leftmost_x, highest_y, rightmost_x, lowest_y
def getBoundsFromStartEndPoints(start_point, end_point):
start_x, start_y = start_point
end_x, end_y = end_point
width = end_x - start_x
height = end_y - start_y
if width < 0:
start_x += width
width = abs(width)
if height < 0:
start_y += height
height = abs(height)
return start_x, start_y, width, height
def convertPixbufToImage(pixbuf):
assert(pixbuf.get_colorspace() == gtk.gdk.COLORSPACE_RGB)
dimensions = pixbuf.get_width(), pixbuf.get_height()
stride = pixbuf.get_rowstride()
pixels = pixbuf.get_pixels()
mode = pixbuf.get_has_alpha() and "RGBA" or "RGB"
return Image.frombuffer(mode, dimensions, pixels,
"raw", mode, stride, 1)
width, height = pixbuf.get_width(), pixbuf.get_height()
return Image.fromstring("RGBA", (width, height), pixbuf.get_pixels())
def rgbaToInteger(rgba):
r, g, b, a = rgba
return (r << 24) | (g << 16) | (b << 8) | a
def colorsContrast(color1, color2, tolerance = 120):
return abs(color1 - color2) > tolerance
def getImageResolution(image_object):
image_object
resolution = (300, 300)
if 'dpi' in image_object.info.keys():
resolution = image_object.info['dpi']
return resolution
def getImageResolutionFromPath(image_path):
image = Image.open(image_path)
return getImageResolution(image)
def getImagePrintSizeFromPath(image_path):
image_object = Image.open(image_path)
return getImagePrintSize(image_object)
def getImagePrintSize(image_object):
resolution = getImageResolution(image_object)
x_resolution, y_resolution = resolution
width, height = image_object.size
return ( float(width) / float(x_resolution), float(height) / float(y_resolution) )
def getTextSizeFromImage(image):
width, height = image.size
colors = image.getcolors(width * height)
background_color = 255
if colors:
colors.sort()
background_color = (list(colors[-1][1])).pop()
text_sizes = [0]
for i in xrange(getTextBeginHeight(image), height):
current_line = image.crop((0, i - 1, width, i))
current_line.convert('L')
blank_line = True
for i in range(0, current_line.size[0], 3):
color = current_line.getpixel((i, 0))
if colorsContrast(list(color).pop(), background_color):
blank_line = False
break
if blank_line:
if text_sizes[-1]:
text_sizes.append(0)
else:
text_sizes[-1] += 1
text_sizes.sort()
text_sizes = [i for i in text_sizes if i != 0]
text_size = 0
if text_sizes:
text_sizes_avg = sum(text_sizes) / len(text_sizes)
for i in text_sizes:
if i > text_sizes_avg:
text_size = math.floor(i)
break
text_size = max(text_sizes)
debug('Text Size: ', text_size)
return text_size
def getTextBeginHeight(image):
width, height = image.size
for i in range(1, height, 1):
current_line = image.crop((0, i - 1, width, i))
colors = current_line.getcolors()
foreground_color = [0, 0, 0]
if colors:
foreground_color = [0 for value in list((colors[0][1])[:-1])]
if colors:
for color in colors:
if list(color[1])[:-1] == foreground_color:
return i
return -1
def getHorizontalAngleForText(image):
width, height = image.size
longest_axis = math.sqrt(width ** 2 + height ** 2)
collage = Image.new('RGBA', (longest_axis, longest_axis), 'white')
test_image = image.copy().convert('RGBA')
y_to_paste = (longest_axis - test_image.size[1]) / 2
x_to_paste = (longest_axis - test_image.size[0]) / 2
original_paste = collage.copy()
original_paste.paste(test_image, (x_to_paste, y_to_paste), test_image)
previous_text_begin = getTextBeginHeight(original_paste)
paste_image = original_paste.copy()
angle = 0
while angle > -360:
current_text_begin = getTextBeginHeight(paste_image)
if previous_text_begin > current_text_begin or current_text_begin == -1:
break
previous_text_begin = getTextBeginHeight(paste_image)
angle -=5
paste_image = original_paste.rotate(angle)
collage = Image.new('RGBA', paste_image.size, 'white')
collage.paste(paste_image, (0,0), paste_image)
paste_image = collage
if angle:
return angle + 5
return angle
def getImageRotated(image, angle):
transparent_bg_image = image.copy().convert('RGBA')
transparent_bg_image = transparent_bg_image.rotate(angle, Image.BICUBIC, expand = True)
collage = Image.new('RGBA', transparent_bg_image.size, 'white')
collage.paste(transparent_bg_image, (0, 0), transparent_bg_image)
return collage
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