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-rw-r--r--.gitignore226
-rw-r--r--02_HelperFunctions.py83
-rw-r--r--images/hummingbird_from_pixabay.pngbin0 -> 449215 bytes
-rw-r--r--images/hummingbird_from_pixabay2.pngbin0 -> 354063 bytes
-rw-r--r--images/hummingbird_from_pixabay3.pngbin0 -> 153971 bytes
-rw-r--r--openCVTools.py45
-rw-r--r--pyvenv.cfg3
7 files changed, 357 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
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+# Created by https://www.toptal.com/developers/gitignore/api/python,visualstudiocode,linux,windows
+# Edit at https://www.toptal.com/developers/gitignore?templates=python,visualstudiocode,linux,windows
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
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+develop-eggs/
+dist/
+downloads/
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+.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
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+#pdm.lock
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+
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+__pypackages__/
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+celerybeat.pid
+
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+*.sage.py
+
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+ENV/
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+/site
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+# mypy
+.mypy_cache/
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+# 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.
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+### VisualStudioCode ###
+.vscode/*
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+!.vscode/*.code-snippets
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+# Local History for Visual Studio Code
+.history/
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+# Built Visual Studio Code Extensions
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+### VisualStudioCode Patch ###
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+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
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+[Dd]esktop.ini
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+$RECYCLE.BIN/
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+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.toptal.com/developers/gitignore/api/python,visualstudiocode,linux,windows
diff --git a/02_HelperFunctions.py b/02_HelperFunctions.py
new file mode 100644
index 0000000..1ef0944
--- /dev/null
+++ b/02_HelperFunctions.py
@@ -0,0 +1,83 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+
+
+import cv2 as cv
+import openCVTools as cvt
+import numpy as np
+import matplotlib.pyplot as plt
+
+def REPLACE_THIS(input): return input
+
+
+# load image
+imgOriginal = cvt.safeLoad('images/hummingbird_from_pixabay.png')
+cvt.showImage("Original image", imgOriginal)
+
+
+# TODO Aufgabe 1
+'''
+Konvertieren Sie das Bild in ein 1-Kanal Schwarzweiß(Grauton)-Bild.
+Passen Sie die Funktionen `imageStats(..)` und `showImage(..)` so an, dass sie sowohl für Grau- als auch Farbbilder korrekt funktionieren.
+'''
+imgGray = REPLACE_THIS(imgOriginal)
+cvt.showImage("Grayscale image", imgGray)
+
+
+'''
+Konvertieren Sie das originale Bild von seinem Stndarddatentyp (`uint8` pro Farbkanal) in `float` und zeigen Sie es an.
+Voraussichtlich wird das Bild nahezu weiß sein. Versuchen Sie herauszufinden woran das liegt und passen Sie das Bild entsprechend an.
+'''
+img = REPLACE_THIS(imgOriginal)
+print("Floating point image:")
+cvt.showImage("Floating point image", img)
+
+
+# TODO Aufgabe 2
+'''
+Zeichnen Sie ein rotes Rechteck (110 x 220 Pixel) genau in die Mitte des Bildes.
+Versuchen Sie dazu den Slicing Operator aus Python zu nutzen.
+'''
+#
+# ???
+#
+
+cvt.showImage("Red box", img)
+
+
+# TODO Aufgabe 3
+'''
+Hängen Sie eine Callback-Funktion `mouse_move(event)` an das Bild im Fenster "Red box", die bei jeder Mausbewegung aufgerufen wird. Sie soll die Bild(!)-Koordinaten des Mauszeigers (x, y) und evtl. gedrückte Tasten ausgeben.
+Sie benötigen dazu u.U. die Referenz auf das Zeichenfeld des Fensters (`plt.figure(title)`) aus der Funktion `showImage(..)`.
+'''
+#
+# ???
+#
+
+'''
+Optional: Entfernen Sie die Callback-Funktion, sobald auf das Bild geklickt wird.
+'''
+#
+# ???
+#
+
+
+# TODO Aufgabe 4
+'''
+Schreiben Sie eine Funktion `showImageList(...)`, die Bilder auch als Liste annimmt und diese horizontal nebeneinander anzeigt.
+'''
+img2 = cvt.safeLoad('images/hummingbird_from_pixabay2.png')
+img3 = cvt.safeLoad('images/hummingbird_from_pixabay3.png')
+
+# cvt.showImageList("Image list", (imgOriginal, img, img2, img3))
+
+
+# TODO Aufgabe 5
+'''
+Erweitern Sie die Funktionen `showImage(...)` und `showImageList(...)` um einen weiteren Parameter `normalize` vom Typ Boolean. Wenn dieser auf `False` gesetzt ist, dann soll die Funktion wie bisher funktionieren, wenn dieser auf `True` gesetzt wird, dann soll jedes Eingabebild kopiert und der Kontrast der kopierten Bilder vor der Anzeige mittels Contrast Stretching verbessert werden, damit der gesamte Wertebereich ausgenutzt wird.
+'''
+img3[:,:,:] = img3[:,:,:] / 4 # darken the image to show contrast stretching
+
+#
+# ???
+#
diff --git a/images/hummingbird_from_pixabay.png b/images/hummingbird_from_pixabay.png
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index 0000000..60e845a
--- /dev/null
+++ b/images/hummingbird_from_pixabay.png
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diff --git a/images/hummingbird_from_pixabay2.png b/images/hummingbird_from_pixabay2.png
new file mode 100644
index 0000000..39c756f
--- /dev/null
+++ b/images/hummingbird_from_pixabay2.png
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diff --git a/images/hummingbird_from_pixabay3.png b/images/hummingbird_from_pixabay3.png
new file mode 100644
index 0000000..63ade5a
--- /dev/null
+++ b/images/hummingbird_from_pixabay3.png
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diff --git a/openCVTools.py b/openCVTools.py
new file mode 100644
index 0000000..484c3fa
--- /dev/null
+++ b/openCVTools.py
@@ -0,0 +1,45 @@
+import cv2 as cv
+import sys
+import numpy as np
+import matplotlib.pyplot as plt
+
+
+def safeLoad(pathToFile):
+ '''
+ OpenCV does no validation checks due to performance reasons.
+ Therefore, this function checks if the image could be loaded
+ '''
+ img = cv.imread(pathToFile)
+ if img is None:
+ sys.exit("Image could not be loaded.")
+ return img
+
+
+# TODO Aufgabe 1
+'''
+Passen Sie die Funktion `imageStats(..)` so an, dass sie sowohl Grau- als auch Farbbilder korrekt anzeigt.
+Erweitern Sie die Funktion zusätzlich so dass der Datentyp mit ausgegeben wird.
+'''
+def imageStats(img):
+ '''
+ Returns a few image statistics
+ '''
+ s = img.shape
+ return f'Width: {s[1]}, Height: {s[0]}, Channels: {s[2]}'
+
+
+
+# TODO Aufgabe 1
+'''
+Passen Sie die Funktion `showImage(..)` so an, dass sie sowohl Grau- als auch Farbbilder korrekt anzeigt.
+'''
+def showImage(title, originalImg):
+ print(imageStats(originalImg))
+
+ img = originalImg.copy()
+ img = img[:,:,::-1]
+ plt.figure(title)
+ plt.imshow(img)
+ plt.show()
+
+
diff --git a/pyvenv.cfg b/pyvenv.cfg
new file mode 100644
index 0000000..8810f2d
--- /dev/null
+++ b/pyvenv.cfg
@@ -0,0 +1,3 @@
+home = /usr/bin
+include-system-site-packages = false
+version = 3.10.8