September 2024
Intermediate to advanced
620 pages
13h 38m
German
Content preview from Raspberry Pi Kochbuch, 4. Auflage
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Kapitel 8. Computer Vision
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8.0 Einleitung
Computer Vision (CV) ermöglicht es deinem Raspberry Pi, Dinge zu "sehen". In der Praxis bedeutet das, dass dein Raspberry Pi ein Bild analysieren, nach interessanten Objekten suchen und sogar Gesichter und Text erkennen kann.
Wenn du einen Raspberry Pi an eine Kamera anschließt, die die Bilder liefert, eröffnen sich alle möglichen Möglichkeiten. Dieses Thema wird in Kapitel 9 fortgesetzt, wo wir einen Schritt weiter in den Bereich des maschinellen Lernens vordringen.
8.1 Installation von OpenCV
Problem
Du möchtest die OpenCV Computer Vision Software auf deinem Raspberry Pi installieren.
Lösung
Um OpenCV zu installieren, installiere zuerst die vorausgesetzten Pakete und aktualisiere die NumPy Python-Bibliothek mit diesen Befehlen:
$ sudo apt install libatlas-base-dev $ pip3 install --upgrade pip $ pip3 install imutils $ pip3 install numpy --upgrade
Installiere dann OpenCV selbst mit:
$ pip3 install opencv-python
Nachdem die Installation abgeschlossen ist, kannst du überprüfen, ob alles funktioniert, indem du Python 3 startest, cv2 importierst und die Version überprüfst:
$ python3 Python 3.9.2 (default, Mar 12 2021, 04:06:34) [GCC 10.2.1 20210110] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import cv2 >>> cv2.__version__ '4.6.0' >>> >>> exit()
Beachte, dass ...
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