Visual Studio使用opencv库

1.准备好与vs版本对应的OpenCV，下载网址：https://opencv.org/release/
2.opencv 配置环境变量
①. 在环境变量中添加：OPENCV_DIR，它的值指向OpenCV安装目录：opencv/build/x64/vc15
②. 在path环境变量添加：%OPENCV_DIR%\bin
3.配置visual studio
①.添加依赖库头文件
vs中右键项目进入属性->C/C+±>General->Addition Include Directories添加opencv的库目录：(OPENCV_DIR)…\include，如下图

②. 添加依赖库
在选项：Linker->General->Addition Library Directories，添加:$(OPENCV_DIR)\lib
③. 动态链接库
在选项：Linker->Input->Additional Dependencies, 添加项目需要的库。
其中Release版本需要：opencv_world340.lib
Debug版本需要：opencv_world340d.lib

#include 
#include 
#include 
#include 
using namespace cv;
using namespace std;
int main( int argc, char** argv )
{
    if( argc != 2)
    {
     cout <<" Usage: " << argv[0] << " ImageToLoadAndDisplay" << endl;
     return -1;
    }
    Mat image;
    image = imread(argv[1], IMREAD_COLOR); // Read the file
    if( image.empty() ) // Check for invalid input
    {
        cout << "Could not open or find the image" << std::endl ;
        return -1;
    }
    namedWindow( "Display window", WINDOW_AUTOSIZE ); // Create a window for display.
    imshow( "Display window", image ); // Show our image inside it.
    waitKey(0); // Wait for a keystroke in the window
    return 0;
}

参考资料
参考博客