Ubuntu下多版本OpenCV共存和切换

查詢opencv版本

$ pkg-config --modversion opencv

下载OpenCV

首先去https://opencv.org/releases.html下载所需版本的Sources版

安裝

$ cd opencv-3.4.2
$ mkdir build
$ cd ..
$ mkdir installed
$ cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/home/mirrorubuntu/workspace/opencv-3.4.2/installed ..
$ make -j4
$ sudo make install

也就是說opencv-3.4.2下有build和installed兩個文件夾

錯誤1：編譯文件夾位置錯誤

更改.bashrc

添加bashrc

$ export PKG_CONFIG_PATH=/home/mirrorubuntu/workspace/opencv-3.4.2/installed/lib/pkgconfig
$ export LD_LIBRARY_PATH=/home/mirrorubuntu/workspace/opencv-3.4.2/installed/lib

$ source ~/.bashrc 

查看结果

$ pkg-config --modversion opencv

https://blog.csdn.net/learning_tortosie/article/details/80594399?spm=1001.2101.3001.6661.1&utm_medium=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1.pc_relevant_paycolumn_v3&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1.pc_relevant_paycolumn_v3&utm_relevant_index=1

运行工程：
CMakelist.txt

project(slam-dynamic)
set(OpenCV_DIR "~/workspace/opencv-3.4.2/build") 

如果想使用之前的版本，在~/.bashrc中注释掉增加的内容，然后source ~/.bashrc即可。