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Build OpenCV

You can check your currently installed cv2 options with:

python3
import cv2
print(cv2.getBuildInformation())

Prepare

Add symbolic link for cblas.h to /usr/include (required by OpenCV)

cd ~
sudo ln -sf /usr/include/arm-linux-gnueabihf/cblas.h /usr/include/cblas.h

Clone the Source

wget -O opencv.zip https://github.com/opencv/opencv/archive/4.2.0.zip
unzip opencv.zip
rm opencv.zip
mv opencv-4.2.0 opencv
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.2.0.zip
unzip opencv_contrib.zip
rm opencv_contrib.zip
mv opencv_contrib-4.2.0 opencv_contrib

Modify Code

Disable extranous USB camera warnings

cd ~/opencv
sed -i -e '/JWRN_EXTRANEOUS_DATA/d' 3rdparty/libjpeg/jdmarker.c
sed -i -e '/JWRN_EXTRANEOUS_DATA/d' 3rdparty/libjpeg-turbo/src/jdmarker.c

Get a patch to add openblas, tbb support and atomic compliler/linker option

wget https://raw.githubusercontent.com/wpilibsuite/FRCVision-pi-gen/frcvision/stage3/01-sys-tweaks/files/opencv.patch
patch -p0 < opencv.patch

Build Opencv

From https://www.learnopencv.com/install-opencv-4-on-raspberry-pi/

This build uses TBB, NEON, VFPV3 for raspi optimization. For 4.x you need to add -latomic and precompiled headers off and c++11 standad. These are suggested build options.

mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
      -D WITH_FFMPEG=OFF \
      -D WITH_GSTREAMER=ON \
      -D WITH_TBB=ON \
      -D WITH_V4L=ON \
      -D WITH_LIBV4L=ON \
      -D WITH_EIGEN=ON \
      -D BUILD_TBB=ON \
      -D BUILD_JPEG=ON \
      -D BUILD_TESTS=OFF \
      -D BUILD_EXAMPLES=ON \
      -D BUILD_JAVA=ON \
      -D BUILD_SHARED_LIBS=ON \
      -D BUILD_opencv_python3=ON \
      -D BUILD_opencv_java=ON \
      -D BUILD_NEW_PYTHON_SUPPORT=ON \
      -D ENABLE_CXX11=ON \
      -D ENABLE_NEON=ON \
      -D ENABLE_VFPV3=ON \
      -D ENABLE_PRECOMPILED_HEADERS=OFF \
      -D WITH_LIBREALSENSE=ON \
      -D WITH_OPENGL=ON \
      -D INSTALL_PYTHON_EXAMPLES=ON \
      -D INSTALL_C_EXAMPLES=OFF \
      -D OPENCV_ENABLE_NONFREE=ON \
      -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \
      -D OPENCV_GENERATE_PKGCONFIG=ON \
      -D PYTHON3_INCLUDE_PATH=/usr/include/python3.7m \
      -D PYTHON3_NUMPY_INCLUDE_DIRS=/usr/include/python3.7m/numpy \
      -D OPENCV_EXTRA_FLAGS_DEBUG=-Og \
      -D CMAKE_CXX_STANDARD_REQUIRED=ON \
      -D CMAKE_CXX_FLAGS=-latomic \
      -D OPENCV_EXTRA_EXE_LINKER_FLAGS=-latomic \
      -D CMAKE_CXX_STANDARD=11 \
      -D CMAKE_INSTALL_PREFIX=/usr/local \
      -D CMAKE_DEBUG_POSTFIX=d ..

If you like to inspect the make file

cmake-gui ../

Compile and Install

make -j3
sudo make install
sudo ldconfig

Work in progress: Java is no fully built

sudo cp -p lib/libopencv_java*.so "/usr/local/lib/"
sudo mkdir -p /usr/local/java
sudo cp -p bin/opencv-*.jar "/usr/local/java/"