一、环境介绍
ubuntu版本: VM虚拟机运行ubuntu18.04 64位
OpenCV版本: 3.4.9
二、相关源码包下载地址
OpenCV源码下载地址: https://opencv.org/releases/
选择3.4.9版本下载。
三、编译OpenCV
3.1 安装cmake
代码语言：javascript复制wbyq@wbyq:~/work$ cmake-gui
Command 'cmake-gui' not found, but can be installed with:
sudo snap install cmake # version 3.16.5, or
sudo apt install cmake-qt-gui
See 'snap info cmake' for additional versions.
wbyq@wbyq:~/work$没有cmake就执行下的命令安装。
代码语言：javascript复制wbyq@wbyq:~/work/opencv-3.4.9/_install$ sudo apt-get install cmake
wbyq@wbyq:~/work/opencv-3.4.9/_install$ sudo apt install cmake-qt-gui
wbyq@wbyq:~/work/opencv-3.4.9/_install$ sudo apt-get install libgtk2.0-dev
wbyq@wbyq:~/work/opencv-3.4.9/_install$ sudo apt-get install pkg-config3.2 解压OpenCV源码
代码语言：javascript复制wbyq@wbyq:~/work_pc$ unzip /mnt/hgfs/linux-share-dir/opencv-3.4.9.zip
wbyq@wbyq:~/work_pc$ ls
arm-linux-gcc opencv-3.4.9 rk3399
wbyq@wbyq:~/work_pc$ cd opencv-3.4.9/
wbyq@wbyq:~/work_pc/opencv-3.4.9$ ls
3rdparty apps cmake CMakeLists.txt CONTRIBUTING.md data doc include LICENSE modules platforms README.md samples3.3 配置cmake环境
在源码目录下可以先创建一个_install文件夹用于存放编译之后的文件，再打开cmake配置页面。
代码语言：javascript复制wbyq@wbyq:~/work_pc/opencv-3.4.9$ cmake-gui选择OpenCV源码文件夹和存放编译文件的文件夹。
完成步骤之后，关闭图像配置界面，进入到源码安装目录下，看是否生成了Makefile文件，没有问题就开始编译安装。
代码语言：javascript复制wbyq@wbyq:~/work_pc/opencv-3.4.9$ cd _install/
wbyq@wbyq:~/work_pc/opencv-3.4.9/_install$ ls
3rdparty cmake_uninstall.cmake cvconfig.h modules opencv_python_config.cmake unix-install
apps CMakeVars.txt cv_cpu_config.h opencv2 opencv_python_tests.cfg version_string.tmp
bin configured data OpenCVConfig.cmake opencv_tests_config.hpp
CMakeCache.txt CPackConfig.cmake doc OpenCVConfig-version.cmake python_loader
CMakeDownloadLog.txt CPackSourceConfig.cmake include opencv_data_config.hpp setup_vars.sh
CMakeFiles CTestTestfile.cmake lib OpenCVGenPkgConfig.info.cmake test-reports
cmake_install.cmake custom_hal.hpp Makefile OpenCVModules.cmake tmp
wbyq@wbyq:~/work_pc/opencv-3.4.9/_install$ make && make install
为了方便使用OpenCV，可以写一个配置文件，比如：opencv_3.4.9.profile
内容如下:
代码语言：javascript复制export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/wbyq/work_pc/opencv-3.4.9/_install/install/lib
export PATH=$PATH:/home/wbyq/work_pc/opencv-3.4.9/_install/install/bin然后在命令行执行：source opencv_3.4.9.profile
代码语言：javascript复制wbyq@wbyq:~/work_pc/opencv-3.4.9/_install/install$ pwd
/home/wbyq/work_pc/opencv-3.4.9/_install/install
wbyq@wbyq:~/work_pc/opencv-3.4.9/_install/install$ gedit opencv_3.4.9.profile
wbyq@wbyq:~/work_pc/opencv-3.4.9/_install/install$ source opencv_3.4.9.profile
wbyq@wbyq:~/work_pc/opencv-3.4.9/_install/install$在opencv-3.4.9/samples/cpp/example_cmake目录里官方已经给出了一个example可以拿来测试opencv，使用编译器编译，编译时加上OpenCV相关的库和头文件。
编译示例：
代码语言：javascript复制wbyq@wbyq:~/work_pc/opencv-3.4.9/samples/cpp/example_cmake$ g example.cpp -L /home/wbyq/work_pc/opencv-3.4.9/_install/install/lib/ -I /home/wbyq/work_pc/opencv-3.4.9/_install/install/include/ -lopencv_calib3d -lopencv_objdetect -lopencv_core -lopencv_photo -lopencv_dnn -lopencv_shape -lopencv_features2d -lopencv_stitching -lopencv_flann -lopencv_superres -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_video -lopencv_imgproc -lopencv_videostab -lopencv_ml运行效果： 这份例子代码里默认打开的是/dev/video0设备节点。
