[PYTHON] Installieren Sie OpenCV4 auf Raspberry Pi 3

$ sudo nano /etc/dphys-swapfile

CONF_SWAPSIZE=1024

$ sudo /etc/init.d/dphys-swapfile restart

$ sudo apt update
$ sudo apt install build-essential cmake git pkg-config libgtk-3-dev "libcanberra-gtk*"
$ sudo apt install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libxvidcore-dev libx264-dev
$ sudo apt install libjpeg-dev libpng-dev libtiff-dev gfortran openexr libatlas-base-dev opencl-headers

$ git clone --branch 4.2.0 https://github.com/opencv/opencv.git
$ git clone --branch 4.2.0 https://github.com/opencv/opencv_contrib.git

$ mkdir <path-to-opencv>/opencv/build
$ cd <path-to-opencv>/opencv/build

$ cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_C_EXAMPLES=OFF \
    -D INSTALL_PYTHON_EXAMPLES=OFF \
    -D OPENCV_GENERATE_PKGCONFIG=ON \
    -D ENABLE_NEON=ON \
    -D OPENCV_EXTRA_EXE_LINKER_FLAGS=-latomic \
    -D ENABLE_VFPV3=ON \
    -D BUILD_TESTS=OFF \
    -D OPENCV_ENABLE_NONFREE=ON \
    -D OPENCV_EXTRA_MODULES_PATH=/<path-to-opencv>/opencv_contrib/modules \
    -D BUILD_EXAMPLES=OFF ..

$ make -j4

$ sudo make install

$ pkg-config --modversion opencv4

4.2.0

$ python3 -c "import cv2; print(cv2.__version__)"

4.2.0

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