Hello OpenCV with C++, using Visual Studio 2017 and VcPkg

In this post, I will show how to do your first steps with OpenCV quickly using Visual Studio 2017 and VcPkg.

What is OpenCV?

OpenCV (Open Source Computer Vision) is an open-source and cross-platform library mainly aimed at real-time computer vision. Originally, it was developed by Intel. It is free for use under the BSD license.

What is VcPkg?

Acquiring native libraries on Windows is a critical part of the application development process, and it used to be a nightmare.  VcPkg is a VC++ Packaging Tool that helps to get C and C++ libraries on Windows.

Getting started with VcPkg

If you want to use VcPkg (I strongly recommend it if you are planning to develop software for Windows using C++), you will need:

  1. Clone VcPkg GitHub repository;
  2. Run the VcPkg bootstrapping process
  3. Make all installed packages available to all VS projects.
    .vcpkg integrate install

Done! Now you can get OpenCV in a very easy way.

.vcpkg install opencv

Hello, OpenCV

We are ready to create our application using OpenCV. There is no need to any configuration – we just need #include it.

#include <opencv2/opencv.hpp>
#include <iostream>

int main()
	cv::namedWindow("raw", cv::WINDOW_AUTOSIZE);
	cv::namedWindow("gray", cv::WINDOW_AUTOSIZE);
	cv::namedWindow("canny", cv::WINDOW_AUTOSIZE);

	cv::VideoCapture cap;

	if (!cap.isOpened())
		std::cerr << "Couldn't open capture." << std::endl;
		return -1;
	cv::UMat bgr_frame, gray, canny;

	for (;;) 
		cap >> bgr_frame;
		if (bgr_frame.empty()) break;

		cv::imshow("raw", bgr_frame);

		cv::cvtColor(bgr_frame, gray, cv::COLOR_BGR2GRAY);
		cv::imshow("gray", gray);

		cv::Canny(gray, canny, 10, 100, 3, true);
		cv::imshow("canny", canny);

		char c = cv::waitKey(10);
		if (c == 27) break;

	return 0;

This code starts the camera, capturing images, applying filters on it and displaying the results in three different windows.

That’s all folks.

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3 respostas

  1. This creates a bare-bones installation of opencv. It does not include important dll’s like FFMPEG*.dll. So you’d be unable to open video files. This method is simple and nice… but did not meet expectations. Now I have to redo everything again – the hard way. I should have just done that from the beginning.

    1. Nevermind….. visited the Microsoft site, and it seems you can add vcpkg install opencv[ffmpeg] to get the dlls….

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Elemar Júnior

Sou fundador e CEO da EximiaCo e atuo como tech trusted advisor ajudando diversas empresas a gerar mais resultados através da tecnologia.

Elemar Júnior

Sou fundador e CEO da EximiaCo e atuo como tech trusted advisor ajudando diversas empresas a gerar mais resultados através da tecnologia.

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