openCV imshow not rendering image on screen

I suggest removing the cv::namedWindow statement, and adding

cv::waitKey();

after the cv:imshow statement. You can also check whether the dimensions of the window are correct.

For Python users, using cv2.wait(0) is the solution. So, the overall format goes like this

    cv2.imwrite("DetectionResults.jpg", frame)
    cv2.imshow("DetectionResults", frame)
    cv2.waitKey(0)

You must have:

cv::waitKey(0);

instead of:

system("pause");

The latter just doesn't work. OpenCV needs to pump messages to get the window displayed and updated, and inside that waitKey function is all of the mechanism to do so.

As the documentation says, waitKey only works if you have a HighGUI window open, so in your code, you probably need to do this:

cv::Mat image = cv::imread("F:/office_Renzym/test3.jpg",CV_LOAD_IMAGE_UNCHANGED);

if(image.empty())
{
    cout<<"image not loaded";
}
else
{
    cv::namedWindow( "test", CV_WINDOW_AUTOSIZE );
    cv::imshow("test",image);
    cv::waitKey(0);
}   

In case there's a problem with the image format, you might try loading like this:

cv::Mat image = cv::imread("F:/office_Renzym/test3.jpg",CV_LOAD_IMAGE_COLOR);