在Ubuntu18.04上安装opencv3.4.1

1 sudo apt-get update
2 sudo apt-get upgrade

1 sudo apt-get install build-essential
2 sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
3 sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev

sudo unzip opencv-3.4.1.zip

1 cd opencv-3.4.1
2 mkdir build
3 cd build

[option] sudo cmake -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON ..

[option] sudo camke ..

make -j7

make install

sudo -s

sudo gedit /etc/ld.so.conf.d/opencv.conf

/usr/local/lib

sudo ldconfig

sudo gedit /etc/bash.bashrc

1 PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig  
2 export PKG_CONFIG_PATH  

source /etc/bash.bashrc

pkg-config --modversion opencv

 1 #include 
 2 #include 
 3 
 4 using namespace std;
 5 using namespace cv;
 6 
 7 int main(void)
 8 {
 9 　　Mat src_image_ = imread("test.jpg");     // 读取当前目录下的test.jpg图片，如果保存请使用绝对路径
10 　　imshow("src_image_", src_image_);       // 打开图片文件
11 　　waitKey(5000);                          // 停留5秒钟
12 
13 　　return 0;
14 }

1 cmake_minimum_required(VERSION 3.5)
2 project(test1)
3 set(CMAKE_CXX_STANDARD 11)
4 set(CMAKE_CXX_STANDARD_REQUIRED ON)
5 
6 add_executable(${PROJECT_NAME} opencv_demo.cpp)
7 target_link_libraries(${PROJECT_NAME} opencv_core opencv_highgui opencv_imgcodecs)

1 mkdir build   # 创建目录
2 cd build       # 进入目录
3 cmake ..     # cmake自动查找父目录下的CMakeLists.txt文件
4 make          # 编译生成test1可执行文件
5 ./test1       # 运行可执行文件, 至于代码中打开的图片是相对于test1可执行文件的相对路径