c++ - OpenCV will load image but not display it -

i using cmake , opencv c++ , trying run simple program:

#include "opencv/highgui.h" #include "opencv/highgui.hpp" #include "opencv/cv.h" #include "opencv/cxcore.h" #include "opencv/cxcore.hpp" #include <stdio.h> #include <iostream>  using namespace cv; using namespace std;  int main() {     mat image = imread("test.jpg", cv_load_image_unchanged);    if (!image.data) //check whether image loaded or not    {          cout << "image cannot loaded." << endl;    }    else    {         cout<<"image can loaded."<<endl;         cout<<"size "<<image.size().height<<","<<image.size().width<<endl;         namedwindow( "display window", cv_window_autosize );         imshow( "display image", image );     } } 

when cmake, no errors, , when run program doing ./test, "image can loaded" along correct size of image.

why won't program create new window displays image?

thank you!

use cv::waitkey() after imshow. needed proceed opencv rendering.

use waitkey(0) pause until key pressed or waitkey(1) pause short possible.

for further reference.