OpenCV多版本切换和配置--opencv 安装与卸载、添加 opencv_contrib modules 以及 OpenCv 多版本切换

1. 查看安装Opencv的版本、以及libs和cflags

$   pkg-config --modversion opencv
$   pkg-config --cflags opencv    // 编译链接
$   pkg-config --libs opencv     // 库链接

2. 卸载之前的Opencv版本

$   cd <your_opencv_source_files>/build
$   sudo make uninstall
$   cd .. && rm -rf build

3. 安装opencv_contrib----确保与安装的opencv版本一致

"记住：为方便Opencv的调用和读取，建立opencv的install文件夹"

$   sudo mkdir -p /usr/local/opencv410  (安装的是opencv-4.1.0)
$   cd <your_opencv_source_files>/build
$   sudo rm -rf *  ## 如果之前安装了opencv再安装contrib就需要将之前的清除再重新安装
$   cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local/opencv410 -D OPENCV_EXTRA_MODULES_PATH=<path to opencv_contrib>/modules/ ..

"备注：注意如果要安装opencv_contrib模块，确保将之前build文件下的内容删除，然后再重新编译，否则你就会出错！---ERROR2"

$  cmake-gui
##另外，如果你要使用nonfree模块里面的特征点提取等相关内容，请使用cmake-gui 编译勾选参数OPENCV_ENABLE_NONFREE,另外其他参数跟前面一样 ----ERROR1
$  sudo make -j8
$  sudo make install

4. CMakeLists.txt 调用OpenCV链接库和头文件

    set(CMAKE_PREFIX_PATH "/usr/local/opencv410/lib/cmake/opencv4")
    ## 或者用以下方式设定opencv4的构建路径
    set(OpenCV_DIR "/home/ian/tools/slam_libraries/opencv-4.1.0/build")
    find_package(OpenCV 4 REQUIRED)
    include_directories(${OpenCV_INCLUDE_DIRS})
    target_link_libraries(***     ${OpenCV_LIBS})

5. 编译过程中遇到的两个错误，若按照以上方式安装可避免下述错误

ERROR1: (-213:The function/feature is not implemented) This algorithm is patented and is excluded in this configuration; Set OPENCV_ENABLE_NONFREE CMake option and rebuild the library in function 'create';

ERROR2: error: ‘linemod’ was not declared in this scope template<> struct pyopencvVecConverter<linemod::Match>;

[参考链接]：

1. Ubuntu+OpenCV

2. ubuntu卸载OpenCV+Contribute

Author: Ian

星期六, 13. 七月 2019 10:04上午