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54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
#!/usr/bin/env python
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# Stegano - Stegano is a pure Python steganography module.
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# Copyright (C) 2010-2022 Cédric Bonhomme - https://www.cedricbonhomme.org
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#
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# For more information : https://git.sr.ht/~cedric/stegano
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>
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__author__ = "Cedric Bonhomme"
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__version__ = "$Revision: 0.2 $"
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__date__ = "$Date: 2010/10/01 $"
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__revision__ = "$Date: 2021/11/01 $"
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__license__ = "GPLv3"
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import typing
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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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width, height = img.size
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colours_counter: typing.Counter[int] = 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_counter[r] += 1
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most_common = colours_counter.most_common(10)
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dict_colours = OrderedDict(
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sorted(list(colours_counter.items()), key=lambda t: t[1])
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)
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colours: float = 0
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for colour in list(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 list(dict_colours.keys())[:30], most_common
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