Hello, OpenCV

opencv_basic.cpp

// opencv_basic.cpp 
//

#include "stdafx.h"

// Test environment (Feb 26, 2018)
//  - OpenCV 3.4.0
//  - Visual Studio 2017 win64(x64)

// environment value 'OPENCV_DIR' is 'D:\opencv\build\x64\vc15' (for example)

// BIN path: $(OPENCV_DIR)\bin

// INCLUDE path: $(OPENCV_DIR)\..\..\include
#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>

// LIB path: $(OPENCV_DIR)\lib

// Link lib file
//  - debug mode:	opencv_world340d.lib
//  - release mode:	opencv_world340.lib

int main(int argc, char** argv)
{
	// main function code: https://gist.github.com/EyalAr/3940636

	using namespace cv; 

	//create a gui window:
	namedWindow("Output", 1);

	//initialize a 120X350 matrix of black pixels:
	Mat output = Mat::zeros(120, 350, CV_8UC3);

	//write text on the matrix:
	putText(output,
		"Hello World :)",
		cvPoint(15, 70),
		FONT_HERSHEY_PLAIN,
		3,
		cvScalar(0, 255, 0),
		4);

	//display the image:
	imshow("Output", output);

	//wait for the user to press any key:
	waitKey(0);

	return 0;
}