学习OpenCV3：Cmake+MinGW编译OpenCV

小鱼儿 2023-05-22 10:29 20阅读 0赞

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# 1. 准备 #

## 1.1 下载OpenCV源码 ##

1.  OpenCV下载地址1：[https://opencv.org/releases/][https_opencv.org_releases]

![官网下载][format_png_pic_center]

1.  OpenCV下载地址2：[https://github.com/opencv/opencv/releases][https_github.com_opencv_opencv_releases]

![github下载][github]

1.  OpenCV下载地址3：[https://github.com/opencv/opencv][https_github.com_opencv_opencv]

![OpenCV源码][OpenCV]

**提示：下载地址1和下载地址2可以直接安装OpenCV，其目录自动包含OpenCV的源码，也可直接从下载地址3下载OpenCV的源码，若网速太慢或不能下载可以参考[学习OpenCV3：解决github下载速度慢的方法（码云）][OpenCV3_github]。**

![OpenCV目录][OpenCV 1]

1.  opencv\_contrib下载地址：[https://github.com/opencv/opencv\_contrib][https_github.com_opencv_opencv_contrib]

![opencv\_contrib][opencv_contrib]

## 1.2 下载安装CMake ##

CMake下载地址：[https://cmake.org/download/][https_cmake.org_download]

![CMake官网下载][CMake]

![CMake目录][CMake 1]

## 1.3 下载安装MinGW ##

MinGW下载地址：[https://osdn.net/projects/mingw/releases/][https_osdn.net_projects_mingw_releases]

![mingw-get-setup.exe][]

![MinGW目录][MinGW]

**提示：将MinGW的bin目录（C:\\Mingw-w64\\mingw32\\bin）添加系统变量的path中。**

# 2. CMake生成OpenCV的Makefile #

1.  打开cmake-gui.exe

![cmake-gui.exe][]

1.  将opencv\_contrib存放opencv目录下，新建bulid\_mingw用于存放编译后OpenCV。

![opencv\_contrib和bulid\_mingw][opencv_contrib_bulid_mingw]

1.  填写源码地址**D:\\opencv\\sources**和目标地址**D:\\opencv\\bulid\_mingw**，点击**Configue**。选择**MinGW Makefiles**，使用默认选项**Use default native compilers**，点击**Finish**。**注意初次Configue时必然有错误提示。**

![Cmake][]

![MinGW Makefiles][]

![初次Configue结果][Configue]

1.  找到**OPENCV\_EXTRA\_MODULES\_PATH**并添加**opencv\_contrib的modules目录**（D:\\opencv\\opencv\_contrib\\modules）。勾选**BUILD\_opencv\_word**，避免编译生成过多的lib文件（实际是将所有lib文件都综合到opencv\_word）。多次点击**Configue**直到不再报错。最后点击**Generate**。

![OPENCV\_EXTRA\_MODULES\_PATH][OPENCV_EXTRA_MODULES_PATH]

![BUILD\_opencv\_word][BUILD_opencv_word]

![Generate结果][Generate]

1.  无法下载opencv\_videoio\_ffmpeg.dll等文件？

![无法下载opencv\_videoio\_ffmpeg.dll][opencv_videoio_ffmpeg.dll]

解决方法：[学习OpenCV3：Cmake编译OpenCV时无法下载ffmpeg、xfeatures2d等文件][OpenCV3_Cmake_OpenCV_ffmpeg_xfeatures2d]

1.  validate setupvars script in install？

![validate setupvars script in install][]

解决方法：可忽略，或者取消勾选OPENCV\_GENERATE\_SETUPVARS。

![取消勾选OPENCV\_GENERATE\_SETUPVARS][OPENCV_GENERATE_SETUPVARS]

# 3. MinGW编译OpenCV #

1.  编译命令

// 跳转到bulid_mingw目录
    cd /d D:\opencv\bulid_mingw
    // 生成
    mingw32-make
    // 将生成的文件存在到install中
    mingw32-make install

![mingw32-make开始][mingw32-make]

![mingw32-make结束][mingw32-make 1]

![mingw32-make install][]

![install文件夹][install]

1.  vs\_version.rc.obj ?

![gcc: error: long: No such file or directory][gcc_ error_ long_ No such file or directory]

[ 65% ] Building RC object modules/world/CMakeFiles/opencv_world.dir/vs_version.rc.obj
    gcc: error: long: No such file or directory
    C:\Mingw-w64\mingw32\bin\windres.exe: preprocessing failed.
    mingw32-make[2]: *** [modules\world\CMakeFiles\opencv_world.dir\build.make:11240: modules/world/CMakeFiles/opencv_world.dir/vs_version.rc.obj] Error 1
    mingw32-make[1]: *** [CMakeFiles\Makefile2:4789: modules/world/CMakeFiles/opencv_world.dir/all] Error 2
    mingw32-make: *** [Makefile:179: all] Error 2

解决方法：[学习OpenCV3：MinGW编译OpenCV到vs\_version.rc.obj处出错][OpenCV3_MinGW_OpenCV_vs_version.rc.obj]

[https_opencv.org_releases]: https://opencv.org/releases/
[format_png_pic_center]: /images/20230521/228d22ca1d814db193332730ddabae01.png
[https_github.com_opencv_opencv_releases]: https://github.com/opencv/opencv/releases
[github]: /images/20230521/64f13468b89d4e7a9aefed9c5ed6039e.png
[https_github.com_opencv_opencv]: https://github.com/opencv/opencv
[OpenCV]: /images/20230521/d65720e503e44266a10d950cf671c43a.png
[OpenCV3_github]: https://www.jianshu.com/p/9c27d60edc20
[OpenCV 1]: /images/20230521/71d8b5b6825f435898484f184d452357.png
[https_github.com_opencv_opencv_contrib]: https://github.com/opencv/opencv_contrib
[opencv_contrib]: /images/20230521/289db280d6d14243bd2d68237c822e6d.png
[https_cmake.org_download]: https://cmake.org/download/
[CMake]: /images/20230521/f6b01c9239744f478af41ab45ca004dc.png
[CMake 1]: /images/20230521/c44b95adf939414e825f70ee96e9cbc7.png
[https_osdn.net_projects_mingw_releases]: https://osdn.net/projects/mingw/releases/
[mingw-get-setup.exe]: /images/20230521/18c31d34e2814414a51a731bde5e13f8.png
[MinGW]: /images/20230521/9136f9cae1114025bcb207142622f012.png
[cmake-gui.exe]: /images/20230521/06df508471c84125ae0f2301b272421a.png
[opencv_contrib_bulid_mingw]: /images/20230521/093772c078a14766b4c69a0d78780798.png
[Cmake]: /images/20230521/d13dc67f7d00429284da904ba59424b2.png
[MinGW Makefiles]: /images/20230521/d90d94ed69a14cc8897a9b8f8cf72843.png
[Configue]: /images/20230521/082337ef1b8345c2856e228c9438cdb5.png
[OPENCV_EXTRA_MODULES_PATH]: /images/20230521/78354338d51d4108abec12de63e2a281.png
[BUILD_opencv_word]: /images/20230521/9618ebe141004fcc9d08d650aa4ee5b2.png
[Generate]: /images/20230521/7aaa8c9ca15f4c83a76b87aa6a0b235d.png
[opencv_videoio_ffmpeg.dll]: /images/20230521/79611fabcaf8418c9a6be2e8acd932c7.png
[OpenCV3_Cmake_OpenCV_ffmpeg_xfeatures2d]: https://www.jianshu.com/p/52de9de70891
[validate setupvars script in install]: /images/20230521/965a5e70282f463d978f46ced554355b.png
[OPENCV_GENERATE_SETUPVARS]: /images/20230521/88915d77423e46f98171c246137584e6.png
[mingw32-make]: /images/20230521/c12c71fe55d24d538bee310c6da09697.png
[mingw32-make 1]: /images/20230521/b1362a3d8f0c49ea9dd9d476502b3f0f.png
[mingw32-make install]: /images/20230521/80481a6055dd4c53bfe0cb9c782fce58.png
[install]: /images/20230521/befe6edf39ca4d079dc20cbacd5ebedb.png
[gcc_ error_ long_ No such file or directory]: /images/20230521/9c6b898e976c440f89cb32ce6d58b323.png
[OpenCV3_MinGW_OpenCV_vs_version.rc.obj]: https://www.jianshu.com/p/3c4b1af3837f