nicolasrosa/How to Build OpenCV 3.4.md

## How to Build OpenCV 3.4.md

      
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              How to Build OpenCV 3.4.md
            
          
    How to Build OpenCV 3.4

In Ubuntu 16.04, install the dependencies first and then build the OpenCV 3.4 from source.
sudo apt-get install --assume-yes build-essential cmake git
sudo apt-get install --assume-yes pkg-config unzip ffmpeg qtbase5-dev python-dev python3-dev python-numpy python3-numpy
sudo apt-get install --assume-yes libopencv-dev libgtk-3-dev libdc1394-22 libdc1394-22-dev libjpeg-dev libpng12-dev libtiff5-dev libjasper-dev
sudo apt-get install --assume-yes libavcodec-dev libavformat-dev libswscale-dev libxine2-dev libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev
sudo apt-get install --assume-yes libv4l-dev libtbb-dev libfaac-dev libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev
sudo apt-get install --assume-yes libvorbis-dev libxvidcore-dev v4l-utils vtk6
sudo apt-get install --assume-yes liblapacke-dev libopenblas-dev libgdal-dev checkinstall
sudo apt-get install --assume-yes libgstreamer-plugins-base1.0-dev
In order to install the NVIDIA Cuda Toolkit with CUDNN library, see https://github.com/BVLC/caffe/wiki/Ubuntu-16.04-Installation-Guide#the-gpu-support-prerequisites
Download the latest source archive for OpenCV 3.4 from https://github.com/opencv/opencv/archive/3.4.0.zip
Download the latest source archive for OpenCV Contrib 3.4 from https://github.com/opencv/opencv_contrib/archive/3.4.zip
Enter the unpacked directory. Execute:
mkdir build
cd build/
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D FORCE_VTK=ON \
-D WITH_TBB=ON \
-D WITH_V4L=ON \
-D WITH_QT=ON \
-D WITH_OPENGL=ON \
-D WITH_CUDA=ON \
-D WITH_CUBLAS=ON \
-D CUDA_NVCC_FLAGS="-D_FORCE_INLINES" \
-D WITH_GDAL=ON \
-D WITH_XINE=ON \
-D BUILD_EXAMPLES=ON \
-D BUILD_TIFF=ON \
-D OPENCV_EXTRA_MODULES_PATH=~/Documents/code/install/opencv_contrib/modules ..
sudo make -j $(($(nproc) + 1))
Maybe would be necessary to use an older version for the compiler:
-DCMAKE_CXX_COMPILER=/usr/bin/g++-4.7 -DCMAKE_CXX_FLAGS="-std=c++11 -O3"
You will need to change the CUDA_NVCC_FLAGS to the following if you have CUDA Toolkit 9.0:
CUDA_NVCC_FLAGS="-D_FORCE_INLINES --expt-relaxed-constexpr"
(Note: the compilation fails if you are using Java Development Kit 9.)
This completes the build procedure of OpenCV 3.4. (http://docs.opencv.org/master/d7/d9f/tutorial_linux_install.html)
Troubleshoot

https://stackoverflow.com/questions/46584000/cmake-error-variables-are-set-to-notfound
Installation

Using make

Execute the following:
sudo make install
sudo /bin/bash -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'
sudo ldconfig
sudo apt-get update
and reboot the system.
Using checkinstall (this gives incomplete results without the installation by using make)

While you are in the build directory, execute this command:
sudo checkinstall
Fill in the text as required to give the description and the package name. This will create the OpenCV 3.4 package that has a modern install/uninstall option.

Integration with the Caffe

Return to the Caffe directory and perform a cleanup operation with the command
make clean
(Read more here: https://github.com/BVLC/caffe/wiki/Ubuntu-16.04-Installation-Guide)
First, edit the Makefile.config to include the OpenCV 3.4 library like this...
OPENCV_VERSION := 3
LIBRARY_DIRS := $(PYTHON_LIB) /usr/local/lib /usr/lib /usr/lib/x86_64-linux-gnu/hdf5/serial /usr/local/share/OpenCV/3rdparty/lib/
Then, recompile the entire Caffe project.