init

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/

app.py

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+import gradio as gr
+import monkey
+import tempfile
+
+def encode_decode(data, input_image):
+    if len(data) > 0:
+        fp =tempfile.NamedTemporaryFile(suffix = '.jpg').name
+        img = monkey.encode(data)
+        img.save(fp)
+        return img, fp, None
+    elif input_image is not None:
+        print(input_image)
+        return None, None, monkey.decode(input_image)
+    else:
+        raise Exception("please provide data OR input_image")
+
+
+iface = gr.Interface(fn=encode_decode, inputs=["text", "pil"], outputs=["image", "file", "text"])
+iface.launch()

monkey.py

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+from email.mime import base
+import glob
+import random
+from PIL import Image
+
+def random_base_img():
+    img_fn = random.choice(glob.glob("./base_images/*.jpg"))
+    return Image.open(img_fn, "r")
+
+
+def modify_pixel(pixel, data):
+    data_lst = [format(ord(d), '08b') for d in data]
+    data_len = len(data_lst)
+    imdata = iter(pixel)
+ 
+    for i in range(data_len):
+        pix = [value for value in imdata.__next__()[:3] +
+                                imdata.__next__()[:3] +
+                                imdata.__next__()[:3]]
+ 
+        # Pixel value should be made
+        # odd for 1 and even for 0
+        for j in range(0, 8):
+            if (data_lst[i][j] == '0' and pix[j]% 2 != 0):
+                pix[j] -= 1
+ 
+            elif (data_lst[i][j] == '1' and pix[j] % 2 == 0):
+                if(pix[j] != 0):
+                    pix[j] -= 1
+                else:
+                    pix[j] += 1
+ 
+        # Eighth pixel of every set tells
+        # whether to stop ot read further.
+        # 0 means keep reading; 1 means thec
+        # message is over.
+        if (i == data_len - 1):
+            if (pix[-1] % 2 == 0):
+                if(pix[-1] != 0):
+                    pix[-1] -= 1
+                else:
+                    pix[-1] += 1
+ 
+        else:
+            if (pix[-1] % 2 != 0):
+                pix[-1] -= 1
+ 
+        pix = tuple(pix)
+        yield pix[0:3]
+        yield pix[3:6]
+        yield pix[6:9]
+
+def encode(data): 
+    print("encoding: ", data)
+    base_img = random_base_img()
+    w = base_img.size[0]
+    (x, y) = (0, 0)
+ 
+    for pixel in modify_pixel(base_img.getdata(), data):
+        base_img.putpixel((x, y), pixel)
+        if (x == w - 1):
+            x = 0
+            y += 1
+        else:
+            x += 1
+
+    print("decoded:", decode(base_img.copy()))
+    return base_img.copy()
+ 
+
+def decode(img):
+    data = ''
+    imgdata = iter(img.getdata())
+
+    while (True):
+        pixels = [value for value in imgdata.__next__()[:3] +
+                                imgdata.__next__()[:3] +
+                                imgdata.__next__()[:3]]
+
+        # string of binary data
+        binstr = ''
+
+        for i in pixels[:8]:
+            if (i % 2 == 0):
+                binstr += '0'
+            else:
+                binstr += '1'
+
+        data += chr(int(binstr, 2))
+        if (pixels[-1] % 2 != 0):
+            return data