Now, let's shed some light on the functions. The cv2.imshow function is needed to show the image—its first parameter is the name of the window (see the header of the window in the following screenshot), the second parameter is the image we want to display. The cv2.waitKey function is necessary for controlling the display time of the window.
Note that the display time must be explicitly controlled, otherwise you won't see any windows. The function takes the duration of the window display time in milliseconds. But if you press any key on the keyboard, the window will disappear earlier than the specified time. We will review this functionality in one of the following recipes.
The code above results in the following:
