一.Opencv安装

1. 官网下载Opencv安装包
   
2. 双击下载的软件进行解压
   
   

3. 系统环境变量添加

二.Qt搭建opencv开发环境

1. 创建一个新的Qt项目(Non-Qt Project)
   

2. 打开创建好的项目中的CMakeLists.txt，添加如下代码

   # opencv
   set(OpenCV_DIR "C:\\Program Files\\opencv454\\build")
   set(OpenCV_INCLUDE_DIRS ${OpenCV_DIR}\\include)
   set(OpenCV_LIB_DIRS ${OpenCV_DIR}\\x64\\vc15\\lib)
   set(OpenCV_Debug_LIBS "opencv_world454d.lib")
   set(OpenCV_Release_LIBS "opencv_world454.lib")
   include_directories(${OpenCV_INCLUDE_DIRS})
   link_directories(${OpenCV_LIB_DIRS})
   
   target_link_libraries(${PROJECT_NAME} PUBLIC ${OpenCV_Debug_LIBS})
   target_link_libraries(${PROJECT_NAME} PUBLIC ${OpenCV_Release_LIBS})
   

   

3. main.cpp中添加以下代码

   #include <iostream>
   #include <opencv2/opencv.hpp>
   
   using namespace std;
   
   int main()
   {
       cv::Mat img = cv::Mat::zeros(cv::Size(512, 512), CV_8UC3);
       cv::putText(img, "Hello OpenCV", cv::Point(128, 256), 5, 2, cv::Scalar(0, 0, 255), 3, 8);
       cv::imshow("img", img);
       cv::waitKey(0);
       return 0;
   }
   
   

4. 点击运行，显示图像则说明环境搭建成功