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samples/cpp/tutorial_code/introduction/display_image/display_image.cpp

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+//! [includes]
+#include <opencv2/core.hpp>
+#include <opencv2/imgcodecs.hpp>
+#include <opencv2/highgui.hpp>
+
+#include <iostream>
+//! [includes]
+
+//! [namespace]
+using namespace cv;
+using namespace std;
+//! [namespace]
+
+
+int main( int argc, char** argv )
+{
+    //! [load]
+    String imageName( "HappyFish.jpg" ); // by default
+    if( argc > 1)
+    {
+        imageName = argv[1];
+    }
+    //! [load]
+
+    //! [mat]
+    Mat image;
+    //! [mat]
+
+    //! [imread]
+    image = imread( samples::findFile( imageName ), IMREAD_COLOR ); // Read the file
+    //! [imread]
+
+    if( image.empty() )                      // Check for invalid input
+    {
+        cout <<  "Could not open or find the image" << std::endl ;
+        return -1;
+    }
+
+    //! [window]
+    namedWindow( "Display window", WINDOW_AUTOSIZE ); // Create a window for display.
+    //! [window]
+
+    //! [imshow]
+    imshow( "Display window", image );                // Show our image inside it.
+    //! [imshow]
+
+    //! [wait]
+    waitKey(0); // Wait for a keystroke in the window
+    //! [wait]
+    return 0;
+}