add_opencv_to_visual_studio_2019_project.md

Environment

Windows 10 (64-bit)
Visual Studio 2019

Step 1: Download and extract the pre-built library

Download the latest binary from opencv's Github repository
[OpenCV 4.1.2](https://github.com/opencv/opencv/releases/download/4.1.2/opencv-4.1.2-vc14_vc15.exe)
[OpenCV 3.4.6](https://github.com/opencv/opencv/releases/download/3.4.6/opencv-3.4.6-vc14_vc15.exe)

Step 2: Add to environment variable

add to Path -   C:\opencv\build\x64\vc15\bin

Step 3: Set platform target to x64

Pre-built binaries are built for x64 Windows platforms.

Step 4: Add to Include Directories

Tell the compiler how the OpenCV library looks. This is done by providing a path to the header files build/include.

Project → YourProjectName Properties → go to VC++ Directories → <Edit…> in Include Directories → add -  C:\opencv\build\include

Step 5: Add to Library Directories

Tell the linker where it can find the lib files for different modules.

Project → YourProjectName Properties → go to VC++ Directories → <Edit…> in Library Directories → add -  C:\opencv\build\x64\vc15\lib

Step 6: Add Additional Dependencies

List opencv_world.

Project → YourProjectName Properties → go to Linker → Input → <Edit…> in Additional Dependencies → add -  C:\opencv\build\x64\vc14\lib\opencv_world346d.lib

Check out demo code!

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main()
{
    Mat image = Mat::zeros(300, 600, CV_8UC3);
    circle(image, Point(250, 150), 100, Scalar(0, 255, 128), -100);
    circle(image, Point(350, 150), 100, Scalar(255, 255, 255), -100);
    imshow("Display Window", image);
    waitKey(0);
    return 0;
}