!OpenCV 4.0.1
RaspberryPi3 B+，Jetson Nano，Jetson TX2の各種環境でビルド．
それぞれ，
 dd if=/dev/zero of=swapfile bs=1M count=2048
 sudo mkswap swapfile
 sudo swapon swapfile
で，スワップ領域を用意．
必要そうなものをいろいろインストール
 sudo apt-get install -y build-essential cmake pkg-config
 sudo apt-get install -y libjpeg-dev libtiff5-dev libjasper-dev libpng12-dev libjpeg-dev
 sudo apt-get install -y libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
 sudo apt-get install -y libxvidcore-dev libx264-dev
 sudo apt-get install -y libgtk2.0-dev
 sudo apt-get install -y libatlas-base-dev gfortran
 sudo apt-get install -y python2.7-dev python3-dev
 sudo apt-get install -y python-pip python3-pip
 sudo pip install numpy
 sudo pip3 install numpy
ソースコードを用意して，
 wget -O opencv.zip https://github.com/Itseez/opencv/archive/4.0.1.zip
 unzip opencv.zip
 wget -O opencv_contrib.zip https://github.com/Itseez/opencv_contrib/archive/4.0.1.zip
 unzip opencv_contrib
RaspberryPi3の場合，
 cmake -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX=/usr/local \
    -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-4.0.1/modules \
    -DENABLE_VFPV3=ON \
    -DENABLE_NEON=ON \
    -DBUILD_TESTS=OFF \
    -DWITH_TBB=OFF \
    -DINSTALL_PYTHON_EXAMPLES=ON \
    -DOPENCV_SKIP_PYTHON_LOADER=ON \
    -DOPENCV_PYTHON2_INSTALL_PATH=/usr/local/lib/python2.7/dist-packages \
    -DOPENCV_PYTHON3_INSTALL_PATH=/usr/local/lib/python3.5/dist-packages \
    -DOPENCV_GENERATE_PKGCONFIG=ON \
    -DBUILD_EXAMPLES=ON \
    ..
Jetson Nano，Jetson TX2の場合，
 sudo apt install opencl-headers ocl-icd-libopencl1
を追加でいれて，
 cmake -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_INSTALL_PREFIX=/usr/local \
    -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-4.0.1//modules \
    -DOPENCV_ENABLE_NONFREE=true \
    -DBUILD_EXAMPLE=ON \
    -DWITH_CUDA=ON \
    -DCUDA_ARCH_BIN=6.2 \
    -DCPU_BASELINE=FP16 \
    ..
として
 make
 sudo make install
さて，ビルドは成功する，かな？


...RaspberryPi3ではうまくビルドできたけど，
Jetson NanoとJetson TX2はビルド中にディスクが不足して失敗してた．

!打合せ
北参道→巣鴨→四谷