Python OpenCV – waitKey() Function
waitkey() function of Python OpenCV allows users to display a window for given milliseconds or until any key is pressed. It takes time in milliseconds as a parameter and waits for the given time to destroy the window, if 0 is passed in the argument it waits till any key is pressed.
Examples 1: Display image with a time limit
Using waitKey() method we show the image for 5 seconds before it automatically closes. The code will be as follows:
Python
# importing cv2 moduleimport cv2 # read the imageimg = cv2.imread("gfg_logo.png") # showing the imagecv2.imshow('gfg', img) # waiting using waitKey methodcv2.waitKey(5000) |
Output:
Example 2: Display image until key pressed
Now we can see one example of passing 0 as the parameter. This time instead of automatically closing the window would wait till any key is pressed. The code will be:
Python
# importing cv2 moduleimport cv2 # read the imageimg = cv2.imread("gfg_logo.png") # showing the imagecv2.imshow('gfg', img) # waiting using waitKey methodcv2.waitKey(0) |
Output:
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