Up インストール 作成: 2021-04-06
更新: 2021-04-06

  • 作業環境
    • "python" は python3.7 を指す。


  • パッケージの更新
    $ sudo apt update
    $ sudo apt upgrade -y
    $ sudo reboot


  • opencv が必要とするライブラリの install：
      libhdf5-dev libatlas-base-dev libjasper-dev libqtgui4 libqt4-test libwebp-dev libilmbase-dev libopenexr-dev libavcodec-dev libavformat-dev libswscale-dev libharfbuzz-dev
    $ sudo apt install -y libhdf5-dev libatlas-base-dev libjasper-dev libqtgui4 \
    libqt4-test libwebp-dev libilmbase-dev libopenexr-dev \
    libavcodec-dev libavformat-dev libswscale-dev libharfbuzz-dev


      以上のファイルは，import cv2 でのつぎのエラーを無くすることになるもの：
        $ python >>> import cv2 Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/pi/.local/lib/python3.5/site-packages/cv2/__init__.py", line 3, in <module> from .cv2 import * ImportError: liblapack.so.3: cannot open shared object file: No such file or directory

  • pip のチェック：
    $ ls -la /usr/bin/pip* -rwxr-xr-x 1 root root 302 Apr 11 2019 /usr/bin/pip -rwxr-xr-x 1 root root 302 Apr 11 2019 /usr/bin/pip2 -rwxr-xr-x 1 root root 303 Apr 11 2019 /usr/bin/pip3 -rwxr-xr-x 1 root root 42976 Mar 19 22:01 /usr/bin/pipanel
  • pip, setuptools の更新
    $ sudo pip install -U pip setuptools
      Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting pip Downloading https://files.pythonhosted.org/packages/fe/ef/ 60d7ba03b5c442309ef42e7d69959f73aacccd0d86008362a681c4698e83/ pip-21.0.1-py3-none-any.whl (1.5MB) 100% |████████████████████████████████| 1.5MB 153kB/s Collecting setuptools Downloading https://files.pythonhosted.org/packages/9e/d4/ b99a960314121a003e9f39c61dfde01a1010bb47661e193a7722f7f32d52/ setuptools-54.2.0-py3-none-any.whl (785kB) 100% |████████████████████████████████| 788kB 223kB/s Installing collected packages: pip, setuptools Successfully installed pip-21.0.1 setuptools-54.2.0

    $ ls -la /usr/local/lib/python3.7/dist-packages
      drwxr-sr-x 3 root staff 4096 Apr 7 08:15 _distutils_hack -rw-r--r-- 1 root staff 152 Apr 7 08:15 distutils-precedence.pth drwxr-sr-x 6 root staff 4096 Apr 7 08:15 pkg_resources drwxr-sr-x 7 root staff 4096 Apr 7 08:15 setuptools drwxr-sr-x 2 root staff 4096 Apr 7 08:15 setuptools-54.2.0.dist-info ‥‥

  • opencv-python のインストール
    $ sudo pip install opencv-python
      Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting opencv-python Downloading https://www.piwheels.org/simple/opencv-python/ opencv_python-4.5.1.48-cp37-cp37m-linux_armv7l.whl (10.5MB) 100% |████████████████████████████████| 10.5MB 24kB/s Requirement already satisfied: numpy>=1.14.5 in /usr/lib/python3/dist-packages (from opencv-python) (1.16.2) Installing collected packages: opencv-python Successfully installed opencv-python-4.5.1.48

    $ ls -la /usr/local/lib/python3.7/dist-packages
      drwxr-sr-x 4 root staff 4096 Apr 6 22:38 cv2 drwxr-sr-x 2 root staff 4096 Apr 6 22:38 opencv_python-4.5.1.48.dist-info 　‥‥

    import cv2 を試す：
      $ python >>> import cv2 (エラー無し) >>> print(cv2) <module 'cv2.cv2' from '/usr/local/lib/python3.7/dist-packages/cv2/cv2.cpython-37m-arm-linux-gnueabihf.so'> （cv2 の所在)

  • opencv-contrib-python のインストール (失敗)
    $ sudo pip install opencv-contrib-python
      Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Collecting opencv-contrib-python Downloading https://files.pythonhosted.org/packages/42/02/ 7b2fb0b81266aa3243dd8f392d48db1a206cc9a1856a14228e75c515616e/ opencv-contrib-python-4.5.1.48.tar.gz (148.8MB) 100% |████████████████████████████████| 148.8MB 1.6kB/s Installing build dependencies ... done Requirement already satisfied: numpy>=1.14.5 in /usr/lib/python3/dist-packages (from opencv-contrib-python) (1.16.2) Building wheels for collected packages: opencv-contrib-python Running setup.py bdist_wheel for opencv-contrib-python ... |
    Download 後の build からは，異常に時間がかかる。
    そして，３時間経過したくらいで，フリーズ状態に至る。
    Raspberry Pi のスペックの貧弱が理由と考えられる。