1.打开 cmake-gui,设置源码和生成路径:#

(第二个路径为自己创建的编译路径:要和第一个同级目录)

• Where is the source code: E:/opencv_455/opencv/sources
• Where to build the binaries: E:/opencv_455/opencv_mingw64_build

2.点击 Configure,设置编译器(很关键)#

• Specify the generator for this project: MinGW Makefiles
• Specify native compilers
• Next
• Compilers C: E:\MinGW-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\bin\gcc.exe
• Compilers C++: E:\MinGW-w64\x64-4.8.1-release-posix-seh-rev5\mingw64\bin\g++.exe
• Finish

3.编译配置(默认的其它选项不改)#

• 勾选 WITH_OPENGL
• 勾选 ENABLE_CXX11
• 不勾选 WITH_IPP
• 不勾选 ENABLE_PRECOMPILED_HEADERS

4.再次点击 Configure====》》Generate 生成 Makefile#

无报错即可

1.程序的CMakeLists.txt文件#

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cmake_minimum_required(VERSION 3.18)
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project(test)
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# set(OpenCV_DIR "XXX")
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# xxxx目录包含OpenCVConfig.cmake
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set(OpenCV_DIR "E:/opencv_455/opencv_mingw64_build")
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# 寻找OpenCV库
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find_package( OpenCV REQUIRED )
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# 添加头文件
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include_directories( ${OpenCV_INCLUDE_DIRS} )
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# 链接OpenCV库
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add_executable(test test01.cpp)
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target_link_libraries(test ${OpenCV_LIBS})

2.测试代码#

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#include <iostream>
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#include <fstream>
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#include <opencv2/core/core.hpp>
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#include <opencv2/highgui/highgui.hpp>
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#include <opencv2/imgproc/imgproc.hpp>
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#include<opencv2/opencv.hpp>
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using namespace std;
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using namespace cv;
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int main()
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{
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    Mat images;
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    images = imread("test.jpg",0);
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    cv::Mat grayim;
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    Size dsize = Size(120, 160);
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    Mat shrink;
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    resize(images, shrink, dsize, 0, 0, INTER_AREA);
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    imwrite("after.jpg", shrink);
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    cout<<"处理完成!"<<endl;
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    return 0;
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}

3.mingw64编译运行程序#

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cmake -G "MinGW Makefiles" ..       // 相当于cmake ..
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mingw32-make                       // 相当于make

4.出现的问题:#

出现undefined reference to cv::Mat::Mat()等一系列的undefined reference to XXX

原因是没有正确链接到动态库。或者之前有安装其他版本的opencv

5.解决办法#