OpenCV  3.4.19
Open Source Computer Vision
Launching Viz

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Goal

In this tutorial you will learn how to

Code

You can download the code from here.

#include <opencv2/viz.hpp>
#include <iostream>
using namespace cv;
using namespace std;
static void help()
{
cout
<< "--------------------------------------------------------------------------" << endl
<< "This program shows how to launch a 3D visualization window. You can stop event loop to continue executing. "
<< "You can access the same window via its name. You can run event loop for a given period of time. " << endl
<< "Usage:" << endl
<< "./launching_viz" << endl
<< endl;
}
int main()
{
help();
viz::Viz3d myWindow("Viz Demo");
myWindow.spin();
cout << "First event loop is over" << endl;
viz::Viz3d sameWindow = viz::getWindowByName("Viz Demo");
sameWindow.spin();
cout << "Second event loop is over" << endl;
sameWindow.spinOnce(1, true);
while(!sameWindow.wasStopped())
{
sameWindow.spinOnce(1, true);
}
cout << "Last event loop is over" << endl;
return 0;
}

Explanation

Here is the general structure of the program:

Results

Here is the result of the program.

window_demo.png