一.下载OpenCV4.0的安装文件：
然后安装到你想要的地方
二.添加到Path里面：
并且把文件opencv_world400.dll和opencv_world400d.dll文件复制到
C:\Windows\SysWOW64这个文件夹；
三.配置Vs2019环境（OpenCV4.0只能用x64配置）
1.在把opencv的include添加到Include Directories和vc15\lib添加到Library Directories
2.在把opencv_world400d.lib添加到Additional Dependencies
运行代码
#include <iostream>
#include <opencv2/highgui.hpp>
#include <opencv2/core.hpp>
#include <opencv2/imgcodecs.hpp>
using namespace cv;
using namespace std;
int main()
{
Mat image;
image = imread("C:/Users/Kiripeng/Desktop/out-2950.jpg"); //记得改成自己的路径
if (image.empty())
{
cout << "Could not open or find the image" << std::endl;
return -1;
}
namedWindow("Display window", WINDOW_AUTOSIZE);
imshow("Display window", image);
waitKey(0);
std::cout << "Hello World!\n";
}
