【图文】【DIY便签】如何自行编译OPENCV使用动态库

1 去官网下载安装包和源码

下面红色圈中的是源码，绿色圈中的是安装包：

2 配置工具链

安装过程不说了，教程到处都是。编译的话使用CMAKE，配置如下：

上面两个路径分别是：

• 源码目录
• 编译生成的文件放置的位置，这里放在源码目录下的build目录中

然后点下面那个Configure，配置工具链，也就是选编译器的bin目录，这个看你自己用的啥编译器，我是安装的GNU工具链，还有就是选make工具，我选的是minGW Make Tool，看你自己用的什么。配置的时候它会自己下载第三方包，可能比较慢。

之后就点Gernate生成makefiles，很快。

3 开始编译

生成完了之后就可以进到源码目录编译了，我这里使用mingw32-make.exe 作为make工具

编译过程会有进度提示:

[100%] Building CXX object apps/interactive-calibration/CMakeFiles/opencv_interactive-calibration.dir/rotationConverters.cpp.obj
[100%] Linking CXX executable ..\..\bin\opencv_interactive-calibration.exe
[100%] Built target opencv_interactive-calibration
[100%] Building CXX object apps/version/CMakeFiles/opencv_version.dir/opencv_version.cpp.obj
[100%] Linking CXX executable ..\..\bin\opencv_version.exe
[100%] Built target opencv_version
[100%] Building CXX object apps/version/CMakeFiles/opencv_version_win32.dir/opencv_version.cpp.obj
[100%] Built target opencv_version
[100%] Building CXX object apps/version/CMakeFiles/opencv_version_win32.dir/opencv_version.cpp.obj
[100%] Linking CXX executable ..\..\bin\opencv_version_win32.exe
[100%] Built target opencv_version
[100%] Building CXX object apps/version/CMakeFiles/opencv_version_win32.dir/opencv_version.cpp.obj
[100%] Built target opencv_version
[100%] Built target opencv_version
[100%] Building CXX object apps/version/CMakeFiles/opencv_version_win32.dir/opencv_version.cpp.obj
[100%] Linking CXX executable ..\..\bin\opencv_version_win32.exe
[100%] Built target opencv_version_win32
[100%] Building CXX object apps/model-diagnostics/CMakeFiles/opencv_model_diagnostics.dir/model_diagnostics.cpp.obj
[100%] Linking CXX executable ..\..\bin\opencv_model_diagnostics.exe
[100%] Built target opencv_model_diagnostics

到100%就编译完了：

build/bin目录下会有一堆动态库：

写一个测试demo，这里用官方提供的：

#include <stdio.h>
#include <opencv2/opencv.hpp>
 
using namespace cv;
 
int main(int argc, char** argv )
{
    printf("usage: DisplayImage.out <Image_Path>\n");
    if ( argc != 2 )
    {
        printf("usage: DisplayImage.out <Image_Path>\n");
        return -1;
    }
 
    Mat image;
    image = imread( argv[1], IMREAD_COLOR );
 
    if ( !image.data )
    {
        printf("No image data \n");
        return -1;
    }
    namedWindow("Display Image", WINDOW_AUTOSIZE );
    imshow("Display Image", image);
 
    waitKey(0);waitKey(0);waitKey(0);waitKey(0);waitKey(0);
 
    return 0;
}

用下面这个命令编译：

g++ ./showiamge.cpp 
-I L:\SoftWares\opencv\opencv\build\include 
-L L:/SoftWares/opencv-4.10.0/build/lib 
-lopencv_calib3d4100 -lopencv_core4100 -lopencv_dnn4100 -lopencv_features2d4100 -lopencv_flann4100 -lopencv_gapi4100 -lopencv_highgui4100 -lopencv_imgcodecs4100 -lopencv_imgproc4100 -lopencv_ml4100 -lopencv_objdetect4100 -lopencv_photo4100 -lopencv_stitching4100 -lopencv_ts4100 -lopencv_video4100 -lopencv_videoio4100

注意头文件目录要在安装目录里去找，里面有各个模块的头文件：

-I L:\SoftWares\opencv\opencv\build\include 

安装目录的\build\include:

源码编译目录下的include\只有一个头文件

生成的a.exe就是编译出来的可执行文件，这时候需要把动态库放到同一个目录下：

然后就可以执行了，完事。