Revision history [back]

You forgot to call waitKey function. This function fetchs and handles window events, such as repaint event, so it must be called. Also check that your image was loaded properly:

cv::Mat pic = cv::imread("1.jpg");
if (pic.empty())
{
    cout << "can't load image" << endl;
    return -1;
}
cv::imshow("Smile", pic);
cv::waitKey();