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https://github.com/cedricbonhomme/Stegano.git
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56 lines
No EOL
1.7 KiB
Python
56 lines
No EOL
1.7 KiB
Python
#! /usr/local/bin/python
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#-*- coding: utf-8 -*-
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__author__ = "Cedric Bonhomme"
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__version__ = "$Revision: 0.1 $"
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__date__ = "$Date: 2010/10/01 $"
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import operator
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from PIL import Image
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from collections import Counter
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from collections import OrderedDict
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def steganalyse(img):
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"""
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Steganlysis of the LSB technique.
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"""
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encoded = img.copy()
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width, height = img.size
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colours = Counter()
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for row in range(height):
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for col in range(width):
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r, g, b = img.getpixel((col, row))
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colours[r] += 1
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most_common = colours.most_common(10)
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dict_colours = OrderedDict(sorted(colours.items(), key=lambda t: t[1]))
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colours = 0
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for colour in dict_colours.keys():
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colours += colour
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colours = colours / len(dict_colours)
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#return colours.most_common(10)
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return dict_colours.keys()[:30], most_common
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if __name__ == '__main__':
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# Point of entry in execution mode.
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original_image_file = "./pictures/montenach.png"
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encoded_image_file = "./pictures/montenach_enc.png"
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original_image_file_steganalysed = "./pictures/montenach_steganalysed.png"
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encoded_image_file_steganalysed = "./pictures/montenach_enc_steganalysed.png"
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img_original_image_file = Image.open(original_image_file)
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img_encoded_image_file = Image.open(encoded_image_file)
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img_original_image_file_steganalysed = Image.open(original_image_file_steganalysed)
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img_encoded_image_file_steganalysed = Image.open(encoded_image_file_steganalysed)
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print steganalyse(img_original_image_file)
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print
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print steganalyse(img_encoded_image_file)
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print
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print
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print steganalyse(img_original_image_file_steganalysed)
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print
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print steganalyse(img_encoded_image_file_steganalysed) |