Window management in OpenCV

void namedWindow(const string&winname, int flags=WINDOW_AUTOSIZE )

Parameters:

name – Name of the window in the window caption that may be used as a window identifier. flags – Flags of the window. Currently the only supported flag is CV_WINDOW_AUTOSIZE. If this is set, the window size is automatically adjusted to fit the displayed image, and you cannot change the window size manually. CV_WINDOW_NORMAL - On Qt back end, you may use this to allow window resize. The image will resize itself according to the current window size. By using the | operator you also need to specify if you would like the image to keep its aspect ratio (CV_WINDOW_KEEPRATIO) or not (CV_WINDOW_FREERATIO).

int waitKey(int delay=0)

Parameters: delay – Delay in milliseconds. 0 is the special value that means “forever”.

Click here for Examples.