OpenCV 3 Installation 多版本

opencv-3-installation 多版本

# Added by me
sudo apt-get install freeglut3 freeglut3-dev libtbb-dev libqt4-dev
# install deps
sudo apt-get install build-essential cmake git pkg-config
sudo apt-get install libjpeg8-dev libtiff4-dev libjasper-dev libpng12-dev
sudo apt-get install libgtk2.0-dev
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
sudo apt-get install libatlas-base-dev gfortran
# clone opencv source
mkdir softwares
cd softwares
git clone https://github.com/opencv/opencv.git
git clone https://github.com/opencv/opencv_contrib.git 安装时，这两个版本要对应
cd opencv
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local/opencv3.4/ -D INSTALL_PYTHON_EXAMPLES=ON -D INSTALL_C_EXAMPLES=OFF-D OPENCV_EXTRA_MODULES_PATH=/home/tong/3rdparty/opencv_contrib/modules -D PYTHON_EXECUTABLE=/home/tong/.pyenv/shims/python -D BUILD_EXAMPLES=ON ..
make -j$(nproc)
sudo make install
#sudo /bin/bash -c 'echo "/usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'  无用
sudo ldconfig

vim ~/.bashrc
export PKG_CONFIG_PATH=～/opencv-3.4.1/build/installed/lib/pkgconfig
export LD_LIBRARY_PATH=～/opencv-3.4.1/build/installed/lib
source ~/.bashrc
pkg-config --modversion opencv


多版本切换：
cmake_minimum_required(VERSION 2.8)  
set(OpenCV_DIR "~/opencv-3.4.1/build")   
project(test)  

在python中使用opencv
pip install opencv-python #安装opencv
pip install opencv-contrib-python #安装opencv的contrib扩展包

# Not needed but just do it, you will thank me later on.
sudo apt-get install python-numpy python-scipy python-matplotlib ipython ipython-notebook python-pandas python-sympy python-nose
pip install Cython --install-option="--no-cython-compile"
sudo pip install -U scikit-image

find_package(OpenCV REQUIRED) 
参考帖子：https://blog.csdn.net/ksws0292756/article/details/79511170